Unreferenced date December 2009 Infobox Islands name Negit Island image name Negit Island.jpg image caption Aerial photo of Negit Island. As of 2004, the land bridge shown in the photo has submerged. locator map native name native name link location Mono Lake , Mono County, California country United States coordinates Coord 38 01 N 119 03 W display inline,title archipelago total islands major islands area sqmi highest mount elevation ft 6,522 elevation footnotes br convert 141 ft abbr on 0 above the 2004 lake level. Negit Island is an island in Mono Lake . Negit along with nearby Paoha Island is a volcanic cone less than 2000 years old. It can be considered to be the northernmost of the Mono Craters . Negit is composed of three dark dacite lava flow s. Negit is an important nesting ground for migratory birds, including the California Gull , which can often be seen wheeling in the air above Mono Lake. The fall of the lake level since 1941 created a land bridge to the island. The land bridge permitted predators, such as coyote s, to raid the bird eggs of the island. However, since 1994, the lake level has been permitted to rise and the land bridge is currently submerged. Negit Island is accessible by boat s commonly kayak s . However, the island is off limits from April 1 through August 1, to protect the nesting gulls. See also Mono Lake Tufa State Reserve Mono Basin National Scenic Area List of islands of California File 2009 0722 NegitIsland.jpg thumb left Neget Island in 2009. Category Islands of California Category Lake islands of North America Category Landforms of Mono County, California Category Inyo National Forest Category Sierra Nevada U.S. ... more details
Infobox Australian place type suburb name Kinlyside city Canberra state act image lga Gungahlin est 1991 postcode 2913 pop near nw near n near ne Taylor, Australian Capital Territory Taylor near w Hall, Australian Capital Territory Hall near e Casey, Australian Capital Territory Casey near sw near s near se Nicholls, Australian Capital Territory Nicholls Kinlyside is a designated suburb in Gungahlin , Canberra . The land designated for the suburb has not yet been released for development by the Australian Capital Territory s Land and Development Agency http www.lda.act.gov.au LDA . According to the ACT s Planning and Land Authority, the suburb is named after George Kendall Kinlyside. quote From a well known pioneer family in the Ginninderra Hall area followed in his father s footsteps as wheelwright, coachbuilder and blacksmith at Hall in 1907 he built a hall which served the Hall community for many years active in local affairs and joint secretary of the Hall Progress Association when established in 1906. The suburb is bounded by the village of Hall, Australian Capital Territory Hall to the west, Nicholls, Australian Capital Territory Nicholls to the south east, by Casey, Australian Capital Territory Casey to the east and Clarrie Hermes Drive to the south. The suburb s other boundaries have been surveyed but not yet established. The suburb was gazetted in October 1991 and as of June 2011 has no residents. As of October 2007, maps have been placed around various spots in Gungahlin, and have Kinlyside marked as subject to review . Geology Underneath Kinlyside are acid volcanic rocks from the middle Silurian period. These are from the Hawkins Volcanics. The hills in the west of the suburb are mostly green grey dacite , and the valley bottom is mostly purple andesite covered in part by alluvium . ref Henderson G A M and Matveev G, Geology of Canberra, Queanbeyan and Environs 1 50000 1980. ref See also Geology of the Australian Capital Territory References Reflist coord ... more details
Infobox Australian Place type suburb name Page state act city Canberra image Page IBMap MJC.png caption lga Belconnen postcode 2614 est pop 2,695 2006 census ref name Census2006Y Census 2006 AUS id SSC81391 name Page State Suburb accessdate 2009 04 27 quick on ref ACTgov Ginninderra electorate Ginninderra fedgov Division of Fraser Fraser near nw Florey, Australian Capital Territory Florey near n Florey, Australian Capital Territory Florey near ne Belconnen, Australian Capital Territory Belconnen near e Belconnen, Australian Capital Territory Belconnen near w Scullin, Australian Capital Territory Scullin near sw Hawker, Australian Capital Territory Hawker near s Weetangera, Australian Capital Territory Weetangera near se Macquarie, Australian Capital Territory Macquarie Page is a suburb of Canberra , in the district of Belconnen . The suburb is named in honour of Earle Page Sir Earle Page , a former Prime Minister of Australia Prime Minister . Streets in Page are named in honour of Australian scientists. On Census in Australia 2006 Census night 2006 , Page had a population of 2,695 people. ref name Census2006Y Geology Silurian age Green grey rhyodacite of the Walker Volcanics underlie the south and center of the suburb. A lens of limestone is found just to the west of the center of the suburb. The mid west has purple and green grey dacite of the Walker Volcanics that was deposited before the rhyodacite. The north east has purple rhyodacite from the Deakin Volcanics. The Page north west has pink rhyolite from the Deakin Volcanics. See also Geology of the Australian Capital Territory coord 35 14 18 S 149 02 57 E display title Footnotes reflist Image Page aerial west.jpg thumb right Aerial view from the west commons category Page, Australian Capital Territory Category Suburbs of Canberra canberra geo stub hu Page Ausztr liai f v rosi ter let ... more details
Infobox Australian Place type suburb name Fraser state act city Canberra image Fraser IBMap MJC.png caption lga Belconnen postcode 2615 est 1975 pop 2,156 2006 census ref name Census2006Y Census 2006 AUS id SSC81176 name Fraser State Suburb accessdate 2009 04 11 quick on ref ACTgov Ginninderra electorate Ginninderra fedgov Division of Fraser Fraser near nw near n near ne near e Spence, Australian Capital Territory Spence near w Dunlop, Australian Capital Territory Dunlop near sw Charnwood, Australian Capital Territory Charnwood near s Flynn, Australian Capital Territory Flynn near se Melba, Australian Capital Territory Melba Fraser is a suburb in the Canberra district of Belconnen . It lies at the north west end of Belconnen. The postcode is 2615. The suburb is named after Jim Fraser James Reay Fraser , who was Member of the Australian House of Representatives for the Division of Australian Capital Territory from 1951 to 1970 and Vice Chairman of the Joint Committee of the Australian Capital Territory from 1959 to 1970. It was gazetted on 15 January 1974. Streets are named after early residents of Canberra. Mount Rogers Canberra Mount Rogers reserve is part of Fraser with an elevation of 704 metres. Fraser has a neighbourhood oval and primary school. It is bordered to the north by Kuringa Drive. The median house price for the Fraser suburb 2011 is 410,000. ref http www.allhomes.com.au ah act property research fraser 121462610 ref Geology Silurian age Hawkins Volcanics green grey dacite and quartz andesite fill the suburb. See also Geology of the Australian Capital Territory Fraser Primary School Fraser Primary School is a popular local government primary school. It offers a quality education for students from preschool to year 6. Footnotes reflist portal Australia coord 35 11 33 S 149 03 02 E display title Category Suburbs of Canberra Canberra geo stub hu Fraser Ausztr liai f v rosi ter let ... more details
Infobox Australian Place type suburb name Higgins state act city Canberra image Higgins IBMap MJC.png caption lga Belconnen postcode 2615 est 1969 pop 3,025 2006 census ref name Census2006Y Census 2006 AUS id SSC81246 name Higgins State Suburb accessdate 2009 04 12 quick on ref ACTgov Ginninderra electorate Ginninderra fedgov Division of Fraser Fraser near nw Holt, Australian Capital Territory Holt near n Latham, Australian Capital Territory Latham near ne Florey, Australian Capital Territory Florey near e Scullin, Australian Capital Territory Scullin near w Holt, Australian Capital Territory Holt near sw near s near se Hawker, Australian Capital Territory Hawker Higgins is a suburb in the Canberra district of Belconnen . The postcode is 2615. The suburb is named after politician and judge H. B. Higgins Henry Bournes Higgins 1851 1929 . It was gazetted on 6 June 1968. The streets of Higgins are named after judges. Higgins has two government run schools, Higgins Primary and Higgins Preschool. Geology Rocks in Higgins are from the Silurian age. Green grey rhyodacite of the Walker Volcanics underlie the south and center of the suburb. North of center is purple and green grey dacite of the Walker Volcanics that was deposited before the rhyodacite. Purple pink rhyolite is found in the north east. In the north west is purple and green tuff . See also Geology of the Australian Capital Territory coord 35 13 56 S 149 01 38 E display title Footnotes reflist Category Suburbs of Canberra Canberra geo stub hu Higgins ... more details
more powerful. Geology The Fish Canyon Tuff, made of dacite , is known to be remarkably uniform in its petrological composition and forms a single cooling unit despite the huge volume. Dacite is a silicic ... between basalt poor in silica content and dacite higher silica content in the La Garita Caldera. The caldera ... to have extensive outcrops of a very unusual lava like rock made of dacite that is very similar ... more details
File Aa channel flow from Mauna Loa.jpg thumb right An Lava .CA.BBA.CA.BB.C4.81 okina a okina lava flow from Mauna Loa during its 1984 eruption. An effusive eruption is a volcanic eruption characterized by the outpouring of lava onto the ground as opposed to the violent fragmentation of magma by explosive eruption s . Lava flow s generated by effusive eruptions vary in shape, thickness, length, and width depending on the type of lava erupted, discharge, slope of the ground over which the lava travels, and duration of eruption. ref http volcanoes.usgs.gov images pglossary effusive.php ref For example, basalt lava may become a or p hoehoe . ref http www.geology.sdsu.edu how volcanoes work Basaltic lava.html ref Andesite lava typically forms blocky lava flows, ref http www.geology.sdsu.edu how volcanoes work andesiterhyolite lava.html ref and dacite lava flows often form steep sided mounds called lava domes due to their viscosity . ref http volcanoes.usgs.gov images pglossary dacite.php ref File Kilauea Pu u O o MLK lava fountain video 9 10 February 2005.ogv thumb Time lapse video of Kilauea flank vent eruption, 2005 Effusive eruptions occur when hot, 1200 C runny magmas reach the surface of the Earth s crust. Dissolved gases escape easily as the magma erupts, forming lava that flows downhill quite quickly and easily. Effusive eruptions build up gently sloping volcanoes like the ones in Hawaii. References reflist Types of volcanic eruptions DEFAULTSORT Effusive Eruption Category Volcanic eruption types volcanology stub ca Erupci efusiva cs V levn vulkanismus fr ruption effusive is Fl igos it Eruzione effusiva mn uk ... more details
File 2 2 himal tecto units.gif thumb 300px Map of the Himalya region. Green is the Indus Yarlung suture zone File CoupeHimal2.jpg thumb 300px Cross section of the Himalya, the suture zone is shown in green Image MtKailash location.png thumb right Location of Mount Kailash Mt. Kailash . Indus River Indus Yarlung Zangbo suture zone, the Yarlung Tsangpo River is sometimes called upper Brahmaputra River . The Indus Yarlung suture zone or the Indus Yarlung Tsangpo suture is a tectonic Suture geology suture in southern Tibet and across the north margin of the Himalayas which resulted from the collision between the Indian plate and the Eurasian plate starting about 52 Ma. ref Age of Initiation of the India Asia Collision http geosci.uchicago.edu rowley Rowley Collision Age.html ref The north side of the suture zone is the Ladakh Batholith of the Karakoram Lhasa Block . The rocks of the suture zone consist of an ophiolite m lange s composed of Neotethys oceanic crust al flysch s and ophiolites the Dras Volcanics which are basalt s, dacite s and minor radiolarian chert s the remains of a mid to late Mesozoic volcanic island arc and the Indus Molasse which are an Eocene or later continental clastic sediments. ref D zes, Pierre, 1999, Major tectonic subdivisions of the Himalaya http comp1.geol.unibas.ch zanskar CHAPITRE2 page24.html ref See also Geology of the Himalaya References Reflist Coord missing Tibet DEFAULTSORT Indus Yarlung Suture Zone Category Plate tectonics tectonics stub fr Suture du Tsang Po ... more details
Infobox mountain name Mendeleyeva photo KunashirISS005 E 9401.PNG photo caption NASA picture of Mendeleev in the southern part of Kunashir Island elevation m 888 elevation ref ref name gvp cite gvp vnum 0900 02 name Mendeleev ref prominence location Kunashir Island Kunashir , Kuril Islands , Russia coordinates coord 43.976 N 145.736 E type mountain coordinates ref ref name gvp topo type Stratovolcano age last eruption 1880 first ascent easiest route Mendeleyeva lang ru lang ja Rausu dake is a stratovolcano located in the southern part of Kunashir Island , Kuril Islands , Russia . The dominantly andesite andesitic dacite dacitic volcano is cut by two nested caldera s, the larger 6 7 km in diameter and the smaller 3 3.5 km. A central cone that formed inside the younger caldera was breached to the west by a large debris avalanche about 4200 years ago. A lava dome that grew inside the avalanche escarpment scarp forms the 888 m high point of the volcano. Additional lava domes in the northern part of the older caldera are considered to represent flank activity of the younger caldera. ref name gvp The only unambiguous historical eruption was a small phreatic eruption in 1880. Four fumarole solfatara field s lie at the eastern and northern flanks of the central cone. Goriachy Pliazh geothermal field is located outside the caldera, along the eastern coast. ref name gvp See also List of volcanoes in Russia References Reflist Category Kunashir Island Category Stratovolcanoes Category Active volcanoes ja no Mendelejev vulkan nn Mendelejevvulkanen ru uk ... more details
Infobox mountain name Opal Cone photo Elfin Lakes 2C Opal Cone.jpg photo caption elevation m 1,736 elevation ref prominence m 86 prominence ref location Garibaldi Provincial Park Garibaldi Park , British Columbia , Canada range Garibaldi Ranges coordinates coord 49 49 38.0 N 122 58 16.0 W type mountain region CA display inline,title topo National Topographic System NTS 92.G 15 type Cinder cone age Holocene volcanic arc belt Cascade Volcanoes Cascade Volcanic Arc clear Garibaldi Volcanic Belt last eruption 9300 Before Present BP first ascent easiest route Opal Cone is a cinder cone located on the southeast flank of Mount Garibaldi in the Coast Mountains of British Columbia , Canada . It is the source of a 15 km long broad dacite lava flow with prominent wrinkled ridges. The lava flow is unusually long for a silicic lava flow. Opal Cone is a member of the Cascade Volcanoes , but it is located in the Garibaldi Ranges in the Coast Mountains and not in the Cascade Range proper. See also List of volcanoes in Canada Volcanism of Canada Volcanism of Western Canada Cascade Volcanoes Garibaldi Volcanic Belt Garibaldi Lake volcanic field External links http www.bivouac.com MtnPg.asp?MtnId 5101 Opal Cone in the Canadian Mountain Encyclopedia References http gsc.nrcan.gc.ca volcanoes cat volcano e.php?id gvb ocn 007 Catalogue of Canadian volcanoes Opal Cone gallery Image Elfin Lakes 2.jpg gallery Pacific Ranges Garibaldi Volcanic Belt Category Subduction volcanoes Category Cinder cones of British Columbia Category Parasitic cones Category Holocene volcanoes Category Garibaldi Lake volcanic field BritishColumbiaCoast geo stub fr C ne Opal ... more details
Infobox mountain name Vulcan s Thumb photo Vulcan s Thumb.jpg photo caption elevation m 2290 elevation ref prominence location British Columbia British Columbia, Canada range Pacific Ranges coordinates coord 50.11 N 123.29 W type mountain region CA topo National Topographic System NTS 92J 03 type Stratovolcano age Pleistocene last eruption Pleistocene first ascent None easiest route Vulcan s Thumb is a deeply dissected, unstable stratovolcano ref name SI http gsc.nrcan.gc.ca volcanoes cat volcano e.php?id gvb vth 027 Catalogue of Canadian volcanoes Vulcan s Thumb Retrieved on 2007 10 09 ref located directly on the southern ridge of Pyroclastic Peak . It is one of the five main volcanic peaks of the Mount Cayley massif and remains unclimbed because of technical difficulties and its loose rock. Vulcan s Thumb is believed to have last erupted during the Pleistocene period. ref name SI The creation of Vulcan s Thumb consist of vent breccia, massive lava lava flows , and agglutinated breccia of plagioclase , hypersthene , hornblende , biotite , phyric dacite deposited as part of an edifice that raised upon the southwestern edge of the ancestral Mount Cayley. See also Cascade Volcanoes Garibaldi Volcanic Belt List of volcanoes in Canada Volcanism of Canada Volcanism of Western Canada Mount Cayley References reflist Pacific Ranges Garibaldi Volcanic Belt BritishColumbiaCoast geo stub Category Volcanoes of British Columbia Category Mountains of British Columbia Category Garibaldi Volcanic Belt Category Subduction volcanoes Category Stratovolcanoes ... more details
Infobox mountain name Lonquimay photo Lonquimay Volcano.jpg photo caption Lonquimay s northwest face elevation m 2,865 elevation ref location Chile range Andes coordinates coord 38 22 36 S 71 35 00 W type mountain type Stratovolcano age last eruption 1990 first ascent easiest route Lonquimay Volcano is a stratovolcano of late Pleistocene to dominantly Holocene age, with the shape of a truncated cone. The cone is largely andesite andesitic , though basalt ic and dacite dacitic rocks are present. ref http www.volcano.si.edu world volcano.cfm?vnum 1507 10 ref It is located in the Araucan a Region of Chile , immediately SE of Tolhuaca volcano Tolhuaca volcano. Sierra Nevada stratovolcano Sierra Nevada and Llaima are their neighbors to the south. The snow capped volcano lies within the protected area Malalcahuello Nalcas . The volcano last erupted in 1988 , the eruption ending in 1990 . The Volcanic Explosivity Index VEI was 3. The eruption was from a flank vent and involved lava flows and explosive eruptions. There were fatalities. ref http www.volcano.si.edu world volcano.cfm?vnum 1507 10 &volpage erupt ref See also List of volcanoes in Chile Volcanism in Chile References cite gvp vnum 1507 10 name Lonquimay reflist External links http ludens.cl andin lonqui lonqui.html The Lonquimay volcano andean volcanoes Category Volcanoes of Araucan a Region Category Mountains of Chile Category Stratovolcanoes of Chile Category Active volcanoes Araucan a geo stub de Lonquimay Vulkan es Volc n Lonquimay fr Lonquimay volcan pt Lonquimay vulc o sk Lonquimay sopka ... more details
Infobox mountain name Samsari other name photo photo size photo alt photo caption elevation elevation m 3285 elevation ft elevation ref prominence prominence m prominence ft prominence ref listing range Abul Samsari Range Abul Samsari parent peak location flag Georgia map map alt map caption map relief map size label label position lat d lat m lat s lat NS long d long m long s long EW x y region coordinates coordinates ref grid ref UK grid ref Ireland topo type volcanic arc belt age last eruption first ascent easiest route Mount Samsari lang ka is a peak of the Abul Samsari Range in Georgia country Southern Georgia . The elevation of the mountain is convert 3285 m above sea level. Mount Samsari represents a volcanic cone, inside of which lies a caldera with a diameter of convert 3 km . The floor of the caldera is lined with rocks and glacial debris as well as small lakes. The mountain was built up during the late quaternary period and is made up of dacite dacites . The slopes of Samsari are mainly devoid of vegetation. References Georgian State Soviet Encyclopedia. 1985. Book 9. p. 33. coord missing Georgia country Category Mountains of Georgia country Samsari, Mount Category Volcanoes of Georgia country Samsari, Mount georgia geo stub ka ... more details
Infobox mountain name Tsiteli Khati other name photo photo size photo alt photo caption elevation elevation m 3026 elevation ft elevation ref prominence prominence m prominence ft prominence ref listing range Kharuli Range Kharuli parent peak location flag Georgia map map alt map caption map relief map size label label position lat d lat m lat s lat NS long d long m long s long EW x y region coordinates coordinates ref grid ref UK grid ref Ireland topo type volcanic arc belt age last eruption first ascent easiest route Tsiteli Khati lang ka is a summit of the Kharuli Range in Georgia country Northern Georgia . The elevation of the peak is convert 3026 m above sea level. The mountain is located within the Kheli Volcanic Region of Georgia, an area which is the largest source of volcanism on the southern slopes of the Greater Caucasus Mountain Range within Georgia s boundaries. Tsiteli Khati is built up of holocene age andesites and dacite dacitic lavas. The peak itself is a young volcanic cone with slopes that show no signs of any significant erosion. The vegetation of the mountain consists of subalpine and alpine meadows. References Georgian State Soviet Encyclopedia. 1987. Book 11. p. 319. coord missing Georgia country Category Mountains of Georgia country Category Volcanoes of Georgia country georgia geo stub ka ru ... more details
refimprove date February 2012 Infobox mountain name Chacana photo photo size photo caption Chacana Caldera elevation m 4643 elevation ref ref name gvp cite gvp vnum 1502 022 name Chacana accessdate 2012 01 09 ref prominence m prominence ref location flagicon Ecuador Ecuador map Ecuador region lat d 00 lat m 22 lat s 30 lat NS S long d 78 long m 15 long s 00 long EW W coordinates ref ref name gvp type Caldera last eruption 1773 Chacana is a large 32 km long 18 24 km wide caldera that has erupted in historical times. It forms one of the largest rhyolite centers in the Northern Andes with major eruptions over the past 240,000, 180,00, and 160,000 years ago and has had Andesite andesitic rhyolitic volcanism. ref name gvp With Dacite dactic lava flows continuing into historical times. Lava dome s were also constructed in the Holocene . Chacana is located 30 km from Quito and the large Antisana volcano is constructed to the southeast. Eruptions Eruptions in the past 10,000 years have been limited to small lava flows originating from Fissures. 1760 Eruption A small VEI 0 Eruption, the first in historical time, came from a flank vent on the SW of the Caldera which caused some damage. 1773 Eruption Another small eruption took place in 1773. It came from a fissure in the South part of the caldera. clear See also portal Geography South America Ecuador Mountains Volcanoes Lists of volcanoes List of volcanoes in Ecuador clear References reflist External links http www.volcanodiscovery.com chacana.html Volcano Discovery Chacana Category Volcanoes of Colombia Ecuador geo stub volcano stub ... more details
Infobox mountain name Victory elevation m 1925 location flagicon Papua New Guinea Papua New Guinea , New Guinea island type Stratovolcano last eruption 1935 5 years Victory is a volcano on New Guinea island, Papua New Guinea. It is situated on Cape Nelson, 30 Km from Tufi in an area with no Wadati Benioff zone . It is one of four large Stratovolcano s in Northern New Guinea island, the others being Hydrographers Range , Trafalgar and Lamington Morphology Victory is dominantly Andesitic in origin, but also has traces of Basalt and Dacite , the lavas erupted have an unusually high level of Chromium and Nickel . The volcano is densely foreseted in all but the summit crater. On the sides of the volcano near the summit are four lava dome s, two on the SW flank and two on the NE flank. The summit crater is breached to the SE and was probably created by a landslide. The summit now contains a small crater lake where weak thermal activity continues. Eruptions A small eruption may have occurred in 1810 give or take 10 years , but this event is Uncertain. The only known eruption from Victory was a long term eruption that lasted from the late 19th century to the mid 20th century. 1890 1935 5 years Eruption An eruption from Victory began in around 1890. The eruption extruded a Lava Dome. The eruption produced deadly Pyroclastic flows that probably resulted in the deaths reported by local residents in the 1890 s. The constant glow from Victory s long term eruption which could have ended as late as 1940 provided a beacon for passing ships. The stop date for the eruption is unknown but it ended between 1930 1940. References http volcano.si.edu world volcano.cfm?vnum 0503 03 Global Volcanism Program http www.volcanolive.com victory.html Volcano Live Volcanoes of The World, 3rd ed. 2011, Siebert, Simkin, Kimberly External Links http static.panoramio.com photos original 55876022.jpg Photo of Victory Volcano on Panoramio.com volcano stub coord missing Category Volcanoes of Papua New Gu ... more details
. Uriarra Volcanics appear north west of the Winslade fault. It consists of dacite lava flows and pyroclastic .... The Cotter Porphyry geology Porphyry to the north of the Cotter Dam is actually a dacite flow. There is a limestone ... more details
rocks.jpg thumb Vesicular Dacite on top of Crace Hill File Crace Hill sediment.jpg thumb left Canberra ... vesicular Dacite overlying mudstone. Crace Hill has been designated as a geological monument. The Gungahlin ... more details
level there are two lava flows of a viscous dacite that erupted along a north south fault. Apparently ... deposits in the Holocene with huge ignimbrite deposits, which are mostly pyroclastic dacite and andesite ... more details
Cascade Volcanoes Cascade volcanoes that is made exclusively of dacite Glacier Peak is the other ... cone on the southeast flank of Mount Garibaldi. It is the source of a 15 km long broad dacite lava ... more details
, and hence oldest, portion of this famous sequence of andesite and dacite volcanic rocks. The Birker ... andesite lava flows. Within the andesitic lava flows, the Great Whinscale Dacite lava flow and the associated ... more details
Formation . Basalt ic and later andesite andesitic to dacite dacitic flows of lava covered increasingly ... years ref a dacite lava dome quickly pushed its way through Tehama s destroyed north eastern ... . Since then, smaller dacite domes such as the 1,100 year old Chaos Crags have formed around Lassen. Phreatic steam explosion eruptions, dacite and andesite lava flows along with cinder cone formation ..., the greater the ability of the magma to trap and hold onto gas and water vapor. When high silica dacite .... Dacite magma that is extruded nonexplosively as lava forms lava dome s because it is too viscous ... as lava in less explosive eruptions than dacite because gas and water vapor escape easily from ... been the release of the extensive amounts of lava that formed the dacite domes on its flank. More ... Andesites erupted again in the area starting approximately 300,000 years ago and dacite erupted ... through the north flank of Sifford Mountain and a plug of dacite was pushed up through the west ... between basalt and dacite lava flows. ref name VolcanoHazards Eruptions have occurred at sites including Lassen Peak, Chaos Crags, and Sunflower Flat explosive dacite eruptions followed by dome growth ... 1999 . Geology of U.S. Parklands , page 159 ref Streams of fluid dacite flowed chiefly toward ... dacite domes which rose on Tehama s flanks are Bumpass Mountain, Helen Ridge, Eagle Peak, Vulcan s Castle ... of dacite and dark andesite, which appears to represent two distinct magmas imperfectly mixed during ... glassy dust that melts when ingested into jet engines and damages the lungs of people who inhale it. Dacite ... of rising magma with ground water. ref name VolcanoHazards When dacite magma charged with volcanic ... of potential vents. After an initial explosive eruption, extrusion of gas depleted dacite magma commonly ... more details
absent at higher elevation, where andesite dominates and rhyolite and small volumes of dacite are present ... has included numerous rhyolite and dacite lava flows erupted at high elevations inside and outside ... eruption occurred around 1,000 years ago when rhyolite and dacite erupted at Glass Mountain and associated ..., nearly tree less, steep sided rhyolite and dacite obsidian flow that erupted just outside the eastern ... more details
Infobox lake lake name Dellen image lake caption lake image bathymetry Dellen.png caption bathymetry map location H lsingland basin countries Sweden coords coord 61 51 N 16 42 E region SE X type waterbody display inline,title type inflow outflow catchment length width area 52 km Southern Dellen , 82 km Northern Dellen depth max depth volume 1,226 million m Southern , 1,489 million m Northern residence time shore elevation 42 m islands cities Dellen is a lake system in the provinces of Sweden province of H lsingland , Sweden. It consists of two lakes, Northern Dellen and Southern Dellen , appreciated among fly fishermen for their distinct population of brown trout . Southern Dellen has a surface area of 52 km and a water volume of 1,226 million m . Northern Dellen has an area of 82 km and a water volume of 1,489 million m . The two lakes are only united by a short channel, and it is therefore disputed whether they should be counted as one or two lakes. If counted together, it would have a total area of 130 km , making it the 18th largest Lakes of Sweden Swedish lake . The vaguely circular lake system was formed by an impact crater 89.0 2.7 million years ago, placing the impact in the Upper Cretaceous . The resulting impact crater measures about 19 kilometres in diameter. It has resulted in the area containing the rock Dellenite a rock intermediate in composition between Rhyolite and Dacite , ref name Le Ma tre cite book last Le Ma tre first R.W. title Igneous rocks a classification and glossary of terms recommendations of the International Union of Geological Sciences, Subcommission on the Systematics of Igneous Rocks url http books.google.co.uk books?id t9fzBKbmRUEC&pg PA72&dq 2Bdellenite v onepage&q 2Bdellenite&f false accessdate 27 October 2010 edition 2 year 2002 publisher Cambridge University Press isbn 9780521662154 page 72 ref which has become the provincial rock. ref cite Earth Impact DB name Dellen accessdate 2009 08 19 ref Asteroid 7704 Delle ... more details
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