Image Mineraly.sk dacit.jpg thumb 250px Dacite Image Dacite AphaniticQAPF.gif thumb 250px Aphanitic QAPF diagram denoting daciteDacite IPAc en icon d e s a t is an igneous rock igneous , volcanic ... and rhyolite . The relative proportions of feldspar s and quartz in dacite, and in many other volcanic rocks, are illustrated in the QAPF diagram . Dacite is also defined by silica and alkali contents in the TAS classification . The word dacite comes from Dacia , a province of the Roman Empire which ... described. Composition Dacite consists mostly of plagioclase feldspar with biotite , hornblende , and pyroxene .... Texture Image Different types of dacite 1200px.JPG thumb 300px Grey, red, black, altered white tan, flow banded pumice dacite In hand specimen many of the hornblende and biotite dacites are grey ... it is felsitic or cryptocrystalline. Geological context and formation Image Dacite ThinSection USGS.jpg thumb 300px Thin section of a porphyritic dacite from Mount St. Helens Dacite usually forms as an intrusive rock such as a dike geology dike or sill geology sill . Examples of this type of dacite ... prone to explosive eruption. A notorious example of this is Mount St. Helens in which dacite domes ..., A model for trondhjemite tonalite dacite genesis and crustal growth via slab melting. Journal ..., J., Stewart R., Maury, R., Bellon, H., Drummond, M., Feigenson, M 1991 Dacite Genesis via both Slab .... The formation of dacite provides a great deal of information about the connection between oceanic crust ... from a mafic, dense, short lived one. Dacite s role in the creation of Archean continental crust The process by which dacite forms has been used to explain the generation of continental crust during ... 362, 144 146. ref Molten dacite magma at K lauea Dacite magma was encountered in a drillhole ... drilled as it surged up the drillhole and quenched over a range of 8 m. The dacite magma ... sessions fm08 V23A.html Puna Dacite Magma at Kilauea Unexpected Drilling Into an Active Magma Posters ... more details
Painted Peak is a summit topography peak rising from the north part of Russet Hills in the Gallipoli Heights , Freyberg Mountains . Descriptively named by the New Zealand Antarctic Place Names Committee NZ APC on the proposal of P.J. Oliver , New Zealand Antarctic Research Program NZARP geologist who studied the feature, 1981 82. Ignimbrite and dacite breccia cut by dikes of andesite and dacite give the peak many colors. usgs gazetteer coord 72 27 S 163 45 E display title Category Mountains of Victoria Land Category Pennell Coast VictoriaLand geo stub ... more details
Pebble Creek Formation is a volcano volcanic formation in the Garibaldi Volcanic Belt created when Mount Meager erupted about 2,350 years ago and by two Rock geology rock avalanche deposits. ref name SI http cat.inist.fr ?aModele afficheN&cpsidt 1746803 CAT.INIST Pebble Creek Formation Retrieved on 2007 06 17 ref The two rock avalanches are not linked with the 2,350 BP eruption, although the post eruption avalanche may have its causes in the over steepened slopes produced by the explosive period of the eruption. ref name SI The rocks of the Pebble Creek Formation are the youngest known of the Mount Meager volcanic complex, and are made of dacite . ref name SI The formation includes a dacite lava lava flow , pyroclastic flow s, lahar s and fallout pumice . ref name SI References Reflist coord missing British Columbia Category Volcanology Category Sea to Sky Corridor Category Lillooet Country Category Garibaldi Volcanic Belt Category Stratigraphy of British Columbia Category Holocene volcanism Volcanology stub BritishColumbiaInterior geo stub ... more details
Volcanic Belt Dacite 200,000 years ago Ember Ridge Garibaldi Volcanic Belt Andesite Pleistocene ... Northern Cordilleran Volcanic Province Miocene Mount Meager Garibaldi Volcanic Belt Dacite 2,350 years ... Volcanic Zone Andesite to Dacite Bolivia Nuevo Mundo volcano Chile class wikitable sortable Dome or volcano ... Volcanic Zone Dacite Pliocene Chait n Volcano Chait n Southern Volcanic Zone Rhyolite 2010 Corona ... Lascar Central Volcanic Zone Dacite 2007 Nevados de Chill n Volc n Nuevo Southern Volcanic Zone Dacite 1986 Sollipulli Southern Volcanic Zone Andesite to Dacite Taapaca Central Volcanic Zone Holocene ... more details
Unreferenced stub auto yes date December 2009 Image Mineraly.sk ryodacit.jpg right thumb A sample of rhyodacite from Slovakia Rhyodacite is an extrusive volcanic rock intermediate in composition between dacite and rhyolite . It is the extrusive equivalent of granodiorite . Phenocrysts of sodium rich plagioclase , sanidine , quartz , and biotite or hornblende are typically set in an aphanitic to glassy light to intermediate colored matrix. Rhyodacite is a high silica rock and often exists as explosive pyroclastic volcanic deposits. Commons category Category Aphanitic rocks Category Volcanic rocks Category Volcanology Volcanology stub de Rhyodazit es Riodacita fr Rhyodacite pl Ryodacyt sk Ryodacit ... more details
In igneous petrology an intermediate composition refers to the chemical composition of a rock that has 52 63 wt Silicon dioxide SiO sub 2 sub being an intermediate between felsic and mafic compositions. Typical intermediate rocks include andesite , dacite and trachyandesite among volcanic rocks and diorite and granodiorite among plutonic rocks ref Cite Web url http www.fiveyearpk.com category intermediate title Last 5 years paper work pakistan access date 25 may 2011 ref . References Reflist Igneous rocks Category geochemistry Category Igneous rocks Category Intermediate rocks petrology stub de Intermedi res Gestein et Keskmine kivim nl Intermediair gesteente ja pt Composi o interm dia sk Intermedi rna hornina ... more details
Infobox Australian place type suburb name Taylor city Canberra state act image Taylor ACT.jpg lga Gungahlin est 1991 postcode 2913 pop near nw near n near ne near w near e Moncrieff, Australian Capital Territory Moncrieff near sw Casey, Australian Capital Territory Casey near se Ngunnawal, Australian Capital Territory Ngunnawal near s Ngunnawal, Australian Capital Territory Ngunnawal Taylor is a designated suburb in Gungahlin district Gungahlin , Canberra though the first land release is yet to be announced. The suburb is named after magazine publisher Florence Mary Taylor Florence Taylor OBE , who was editor of and writer for several Australian building industry journals including the influential Building magazine. The suburb is approximately 4 km from the Gungahlin Gungahlin Town Centre and 16 km from the centre of Canberra and bounded by Horse Park Drive. The suburb is located in north Gungahlin adjacent to the existing suburb of Ngunnawal, Australian Capital Territory Ngunnawal and the future suburbs of Casey, Australian Capital Territory Casey and Moncrieff, Australian Capital Territory Moncrieff . History Until 1991, the suburb Taylor was part of the former Gold Creek a 1,594 hectare rural property with the Gold Creek Homestead, Australian Capital Territory Gold Creek Homestead at its centre. ref Newman Chris 2004 , Gold Creek, Reflections of Canberra s Rural Heritage , Gold Creek Homestead Working Group. ref Geology The rocks in Taylor are from the late middle Silurian period. Hawkins volcanics green grey dacite and quartz andesite are in the west. The Canberra Formation is separated by a fault in the east side. It consists of slate y shale and mudstone , with north east trending bands of acid volcanics dacite and andesite . References reflist 1 refbegin See also Geology of the Australian Capital Territory coord 35.162 149.100 region AU type city source GNS enwiki format dms display title Category Suburbs of Canberra Canberra geo stub ... more details
Location map Australian Capital Territory label Williamsdale lat deg 35 lat min 34 lat dir S lon deg 149 lon min 8 lon dir E Williamsdale is a village on the New South Wales Australian Capital Territory border in Australia on the Monaro Highway . The postcode is 2620. Geology To the east of Williamsdale is the Williamsdale Volcanics. These are made up from blue green crystal tuff . The crystals are sized from 0.3 mm to 1 mm and are embedded in a fine matrix. Quartz crystals make up 25 , plagioclase 5 , alkali feldspar 10 , biotite 5 10 which is altered to chlorite , epidote and leucoxene . Middle Silurian Colinton Volcanics foliated dacite and tuff is under Williamsdale. A roughly north south band of these acid volcanics extends to the north along the Monaro Highway and then follows the Cooma road to Cottondale. South the volcanics also follow the Monaro Highway in a more complex band through Colinton past Michelago, New South Wales Michelago and at least as far south as Bredbo, New South Wales Bredbo . To the west of Williamsdale is an outcrop of Upper Silurian Laidlaw Volcanics dark grey rhyodacitic and dacitic crystal tuff. This extends to the west as far as Angle Crossing. This band extends to the north north west as far as Mount Stromlo . The outcrop finishes a couple of kilometres south, but it is also found to the east, with outcrop from Fernleigh, New South Wales Fernleigh in the north, via Burra, New South Wales Burra , and south to Michelago. On the west side of the Murrumbidgee River around Angle Crossing can be found the Bransby Beds or Goosoon Beds. These beds contain tuff and dacite with some sediments. They form a narrow band extending to the south as far as Cooma, New South Wales Cooma following on the east side of the Murrumbidgee River. See also Geology of the Australian Capital Territory External links http www.nswrail.net locations show.php?name NSW Williamsdale&line NSW bombala 0 Williamsdale Railway Siding coord 35 34 S 149 08 E regio ... more details
Unreferenced date December 2009 Orphan date December 2009 Image Paliokastro.jpg thumb right The Acropolis Palaiokastro in Methana Image Paliokastro methana.jpg thumb right Acropolis of ancient Methana is located 1 km from the town of Megalochori Methana , Greece Megalochori in the volcanic peninsula of Methana . It was first built in the Mycenean civilization Mycenean times . It was rebuilt and destroyed later during the Roman Empire Roman and the Byzantine Empire Byzantine times. It was built from andesite and dacite rocks from the volcanic mountain nearby. The small acropolis is located on a small lava dome . Around the acropolis, Pausanias described the ancient market Agor and a sanctuary of Isis and Hermes . Remains of the ancient town Methana can be found around the Paliocastro and some Roman columns in front of the little St. Niclaus chapel. Category Ancient Greek buildings and structures Category Troizina area Greece geo stub ... more details
Infobox mountain name Curacoa photo elevation convert 33 m ft ref name gvp cite gvp vnum 0403 102 title Curacoa accessdate 2010 02 27 ref prominence listing List of volcanoes in Tonga location Tonga Islands range coordinates coord 15.62 S 173.67 W type mountain topo type Submarine volcano age volcanic Arc Belt last eruption 1979 first ascent easiest route caption Curacoa is a submarine volcano located south of Curacoa Reef in northern Tonga . Eruptions were observed in 1973 and 1979, from two separate vents. The 1973 eruption produced a large pumice raft raft of dacite dacitic pumice . That eruption had a Volcanic Explosivity Index VEI of 3. See also List of volcanoes in Tonga References references Category Volcanoes of Tonga Category Submarine volcanoes Category Active volcanoes Tonga geo stub ca Curacoa nl Curacoa vulkaan sk Curacoa sopka ... more details
Roca Consag Consag Rock is a granitic or more precisely, dacite dacitic outcrop located in the northern Gulf of California about 17 miles ENE of the town of San Felipe, Baja California San Felipe . The outcrop stands about 286 feet above the sea, and is named for the Jesuit missionary Ferdinand Kon ak who was active in the early exploration and missionary work in Baja California . The ruins of an abandoned lighthouse can be seen on the west side of the outcrop. ref http www.mexfish.com rkyp rkyp af000823 af000823.htm Beyond Roca Consag A Different Trip To Puerto Pe asco, mexfish.com, photo ref The waters in the vicinity of the Roca Consag are a popular fishing area and also favored for spotting whales and porpoises. References reflist http books.google.com books?id mP0CklZvMMEC&pg PA115&lpg PA115&dq Roca Consag&source bl&ots ZMLLfaezO6&sig 4JL6X7AowJl5mSeCWF1WCsLHcw4&hl en&ei uUXPS8i7DJK2swP4lfiuDg&sa X&oi book result&ct result&resnum 7&ved 0CBMQ6AEwBjgU v onepage&q Roca 20Consag&f false Best Places Baja, by Lori Makabe, 2002, p.115 Category Geology of Mexico regional geology stub ... more details
content and consists of rhyolite or dacite . Dome dynamics Lava domes are Dynamics physics dynamic ... British Columbia , Canada Cascade Volcanic Arc Dacite 2350 BP Mount Merapi Indonesia Sunda Arc Nea Kameni Greece Nevados de Chill n Volc n Nuevo Chile Southern Volcanic Zone Dacite 1986 Puy de D me France Cha ne des Puys ca. 5760 BC Santiaguito Guatemala Central America Volcanic Arc Dacite 2009 Sollipulli Chile Southern Volcanic Zone Andesite to Dacite Soufri re Hills Montserrat Lesser Antilles 2009 ... Iceland Iceland hotspot Rhyolite Unnamed Japan Geology of Japan Japan Arc Dacite Miocene ref Yoshihiko Goto and Nobutaka Tsuchiya. Morphology and growth style of a Miocene submarine dacite lava dome at Atsumi ... more details
of large rhyolite and dacite dome flow complexes U Pb zircon dated at 2.692 Ga . The Innerring and Thlewycho ... sequence on the northwestern side comprises epiclastic volcarenite, rhyolite dacite block breccia from lava domes, polymict breccia, and a conglomerate of andesite, dacite rhyolite clasts, and andesitic ... more details
Infobox mountain name Nevado Anallajsi photo AnallajsiNevado.jpg photo caption The upper right part of the NASA Space Shuttle image shows the eroded volcanic complex Nevado Anallajsi. elevation m 5,750 elevation ref prominence location Bolivia range Andes coordinates coord 17 55 S 68 55 W type mountain topo type Stratovolcano age last eruption Unknown first ascent easiest route Nevado Anallajsi is a stratovolcano in Bolivia . The date of its last eruption is unknown, but its youngest lava flows appear to have erupted from a vent on the north flank of the mountain. The main composition of the volcano is Andesite andesitic and Dacite dacitic . It overlies a plateau which is composed of ignimbrite . See also List of volcanoes in Bolivia Sources Global Volcanism Program DEFAULTSORT Anallajsi Category Stratovolcanoes Category Subduction volcanoes Category Mountains of Bolivia Category Polygenetic volcanoes Category Volcanoes of La Paz Department Bolivia LaPazBO geo stub de Anallajsi es Nevado Anallajsi fr Nevado Anallajsi ka os hu Nevado Anallajsi pl Nevado Anallajsi pt Nevado Anallajsi qu Anallaqsi ... more details
Infobox mountain name Macizo de Larancagua photo photo caption elevation m 5520 elevation ref prominence location Bolivia range Andes coordinates coord 18 15 0 S 63 32 0 W type mountain region BO display inline,title topo type Stratovolcano age last eruption first ascent easiest route Macizo de Larancagua is a stratovolcano in Bolivia . It lies west of Turco municipio Turco and is composed of andesite and dacite . The date of its last eruptive episode is unclear, but some authors have assigned it as Holocene . See also List of volcanoes in Bolivia Sources Global Volcanism Program DEFAULTSORT Macizo De Larancagua Category Stratovolcanoes Category Subduction volcanoes Category Volcanoes of Bolivia Category Mountains of Bolivia Category Polygenetic volcanoes Category Oruro Department Oruro geo stub fr Macizo de Larancagua os ka hu Macizo de Larancagua pl Macizo de Larancagua pt Macizo de Larancagua qu Laram Q awa urqu Uru Uru ... more details
Infobox mountain name Mount Nansen photo photo caption elevation m 1827 elevation ref prominence m 532 prominence ref location Yukon , Canada range coordinates coord 62 06 22.3 N 137 18 10.1 W type mountain region CA display inline,title topo National Topographic System NTS 115J 03 type Stratovolcano age Late Cretaceous volcanic arc belt last eruption first ascent easiest route Mount Nansen is a deeply eroded Late Cretaceous stratovolcano located 53 kilometers west of Carmacks, Yukon Carmacks and 10 kilometers west of Victoria Mountain in the central Yukon , Canada . It consists of rhyolite , dacite , andesite flows, breccia s and tuff . Mount Nansen was formed when the ancient Kula Plate was subduction subducting under North America during the Late Cretaceous period. See also Portal Volcanism of Canada List of volcanoes in Canada Volcanism in Canada External links http www.bivouac.com MtnPg.asp?MtnId 3573 Mount Nansen in the Canadian Mountain Encyclopedia Category Volcanoes of Yukon Nansen, Mount Category Mountains of Yukon Nansen, Mount Category Stratovolcanoes Nansen, Mount Category Subduction volcanoes Nansen, Mount Yukon geo stub fr Mont Nansen Canada ... more details
seealso Palisades Sill Image Palisades Sill sign near Cimarron, NM Picture 2023.jpg 200px right thumb font size 2 Description of Palisades Sill south of Cimarron, New Mexico Cimarron , New Mexico font size 2 Image Palisades Sill in NM Picture 2021.jpg 200px right thumb font size 2 Cliffs of Palisades Sill font size 2 File Palisades sill, NM.jpg thumb 200px left font size 2 Palisades Sill of Cimarron River Canadian River Cimarron River Canyon font size 2 The Palisades Sill is a fine grained porphyritic dacite Sill geology sill which form spectacular cliffs and palisades in the Cimarron River Canadian River Cimarron River canyon between Eagle Nest, New Mexico Eagle Nest and Cimarron, New Mexico Cimarron in northern New Mexico . It can be seen in the eastern part of Cimarron Canyon State Park ref cite web url http geoinfo.nmt.edu tour state cimarron home.html title NMBGMR Geologic Tour Cimarron Canyon State Park publisher New Mexico Bureau of Geology and Mineral Resources accessdate 2009 03 29 ref References reflist coord missing New Mexico Category Geology of New Mexico Category Sills geology br NewMexico geo stub he ... more details
File WheelerGACO.jpg thumb The Fish Canyon Tuff ignimbrite The Fish Canyon tuff is the tuff volcanic deposit resulting from one of the largest known explosive eruptions on Earth, estimated at 5,000 cubic kilometers. ref cite web last Ort first Michael title Largest explosive eruptions url http staff.aist.go.jp s takarada CEV newsletter lagarita.html accessdate 14 August 2010 ref see List of largest volcanic eruptions The eruption was centered at La Garita Caldera in southwest Colorado . The tuff can be assured to belong to one eruption due to its high chemical consistency SiO sub 2 sub bulk 67.5 68.5 dacite , matrix 75 76 rhyolite and consistent phenocryst content 35 50 and composition plagioclase , sanidine , quartz , biotite , hornblende , sphene , apatite , zircon , Fe Ti oxide s are the primary phenocrysts . This tuff and eruption is part of the larger San Juan volcanic field and Mid Tertiary ignimbrite flare up . References references See also Tuff Ignimbrite Mid Tertiary ignimbrite flare up World s largest eruptions Category Volcanic rocks no Fish Canyon Tuff ... more details
Infobox Australian Place type suburb name Hall state act city Canberra image Looking north west up Victoria Street in Hall.jpg caption lga postcode 2618 est 1882 pop 338 2006 census ref name Census2006Y Census 2006 AUS id SSC81231 name Hall State Suburb accessdate 1 June 2009 quick on ref ACTgov Ginninderra electorate Ginninderra fedgov Division of Fraser Fraser near nw Wallaroo, New South Wales near n Springrange, New South Wales near ne near e near w near sw near s Kinlyside, Australian Capital Territory near se Hall is a small town in the north of the Australian Capital Territory ACT , Australia . It was founded in 1882, named after the first landholder in the area, Henry Hall farmer Henry Hall . In 1911 Hall was included within the boundary of the land allocated for the Australian Capital Territory, close to the north western corner, near the New South Wales border. Although considered a village, similar to Tharwa , in practical terms Hall might now be considered an outer suburb of Australia s capital Canberra . In 1954 the main street of Hall which had been part of the state highway system since 1935 was named the Barton Highway . In 1980 the alignment of the highway was shifted to the south as part of a dual carriage upgrade, bypassing Hall completely. Some features of note within Hall village are the equestrian park , playing fields, showground, and former Hall Primary School , along with a small shopping centre and three historic churches. The showground area plays host to the Hall Markets , a popular monthly charity market showcasing hand produced goods. Geology In the Hall area the rocks are all Silurian age volcanic rocks. Green grey and purple quartz andesite and dacite from the Hawkins Volcanics are under the village and extending up the Halls Creek valley. Green grey dacite and quartz andesite from the Hawkins Volcanics cover the surrounding areas including up to the New South Wales border, north to One Tree Hill, south east to the Harcourt Hill, Austr ... more details
broken columns of crystalline dacite at the east base of Mount Boucherie Mount Boucherie is composed ... on the north and south flanks. The more prominent black and dark gray east and north east face is dacite ... , were formed in the later stages of Mount Boucherie s volcanic period, as evidenced by the fact that the dacite ..., the east cliff face is composed of folded volcanic flows of dacite. ref name okgeology How to insert ... of crystalline dacite in the foreground. Image Mount Boucherie top eastern view towards Kelowna.jpg ... more details
tops the rock is from the Hawkins Volcanics, with mostly dacite in the south, and andesite in the north. The north east of the suburb has dacite from the Canberra Formation. The south east has a green grey porphyry geology porphyry with a dacite like composition, and visible white feldspar crystals ... more details
dome composed almost entirely of dacite dacitic lava flows which emerged from several vents ... s. Likewise, because of the high viscosity of the dacite, it is likely that the mountain formed ... dacite. See also Elden Pueblo References reflist External links http wrgis.wr.usgs.gov fact sheet ... more details
Image VolcanicBombMojaveDesert.JPG thumb The smooth texture of this basaltic volcanic bomb is aphanitic. Image LvMS Lvv.jpg thumb An aphanitic volcanic sand grain, with fine grained groundmass, as seen under a petrographic microscope Aphanite , or aphanitic as an adjective, from the Greek language Greek , invisible is a name given to certain igneous rock s which are so fine grained that their component mineral crystal s are not detectable by the unaided eye as opposed to phaneritic igneous rocks, where the minerals are visible to the unaided eye . This texture results from rapid cooling in volcanic or hypabyssal shallow subsurface environments. As a rule, the texture of these rocks is not quite the same as that of volcanic glass e.g. obsidian , with volcanic glass being even finer grained or more accurately, non crystalline than aphanitic rocks, and having a glass like appearance. ref Bates and Jackson, 1984, Dictionary of Geological Terms, 3rd ed., Prepared by the American Geological Institute ref Aphanites are commonly porphyritic , having large crystals embedded in the fine groundmass or matrix geology matrix . The large inclusions are called phenocryst s. They consist essentially of very fine grained minerals, such as plagioclase feldspar , with hornblende or augite , and may contain also biotite , quartz , and orthoclase . Common rocks that can be aphanitic Andesite Basalt Basanite Dacite Felsite Leucitophyre Phonolite Rhyolite Trachyte References references 1911 Category Aphanitic rocks Category Igneous petrology ca Afanita de Aphanitisch fa fr Aphanite he nl Afanitisch nn Afanittisk pt Afan tica vi n tinh th ch h c ... more details
Image Nist stone test wall.jpg thumb 300px right The NIST stone test wall. The NIST stone test wall is an experiment by the United States National Institute of Standards and Technology to determine how different types of construction rock geology stone weather. It includes 2352 samples of stone from 47 different states within the US and 16 different countries. The wall measures approximately 12 m long, 4 m high, 0.6 m thick at the bottom, and 0.3 m at the top. It includes varieties of andesite , argillite slate , basalt , bluestone , breccia , conglomerate geology conglomerate , coquina , coral , dacite , diabase , diorite , dolomite , gabbro , gneiss , granite , granodiorite , greenstone disambiguation greenstone , labradorite , limestone , marble , melaphyre , pitchstone , pumice , pyrophyllite , quartz , quartzite , sandstone , schist , serpentinite , shellstone , soapstone , syenite , travertine , and tuff . The wall was built by one stonemason , Vincent Di Benedeto, in 1948. He used two types of stone setting mortar on the front. He used both a 1 3 lime mortar , with a high calcium hydrate and a 1 0.4 3 portland cement , calcium carbonate whiting , and sand mortar . The wall was moved from its original location in Washington, D.C. to Gaithersburg, Maryland in May 1977. See also PAMELA the Pedestrian Accessibility and Movement Environment Laboratory References http stonewall.nist.gov NIST s stone test wall site Category Stonemasonry Category Building stone Category National Institute of Standards and Technology coord 39.12245 77.22075 display title region US MD type landmark ... more details
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