Information om | Engelska ordet DACITE

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• Pillow lavas are commonly of basaltic composition, although pillows formed of komatiite, picrite, boninite, basaltic andesite, andesite, dacite or even rhyolite are known.
• Bentonite usually forms from the weathering of volcanic ash in seawater, or by hydrothermal circulation through the porosity of volcanic ash beds, which converts (devitrification) the volcanic glass (obsidian, rhyolite, dacite) present in the ash into clay minerals.
• It lies in the southwestern corner of the Long Valley Caldera and consists of about 12 rhyodacite and dacite overlapping domes.
• Consisting of basaltic andesite, andesite, and dacite, the mountain has been extensively altered by glacial erosion.
• Lapilli tuffs are a very common form of volcanic rock typical of rhyolite, andesite and dacite pyroclastic eruptions, where thick layers of lapilli can be deposited during a basal surge eruption.
• During the explosive process, the Venus breccia formed when the ascending dacite magma reacted with groundwater to produce a phreatic eruption.
• The Pliocene Undu Group in the northeastern portion of the island, consists of breccia, tuff, and flows of rhyolite and dacite overlain by pumiceous strata.
• Most of the volcanoes are basalt cinder cones, but there are also large lava domes consisting of rhyolite and dacite.
• It includes varieties of andesite, argillite, basalt, bluestone, breccia, conglomerate, coquina, coral, dacite, diabase, diorite, dolomite, gabbro, gneiss, granite, granodiorite, greenstone, labradorite, limestone, marble, melaphyre, pitchstone, pumice, pyrophyllite, quartz, quartzite, sandstone, schist, serpentinite, shellstone, soapstone, syenite, travertine, and tuff.
• This mountain has produced andesite, basalt and dacite, with relatively silicic andesite dominant in recent eruptions.
• Overlaying these deposits are Cenozoic volcanic rocks, including the thick, Eocene-aged Ohanapecosh Formation, comprised by chemically altered basalt and andesite lava flows and bedded andesite and dacite volcaniclastic rock.
• Most of Campbell is dominated by the lowest layer of the Ainslie Volcanics, a grey dacite and other erupted particles such as agglomerate and tuff.
• Chemically a full spectrum of subduction-zone lava types occur: basalt, mafic andesite, two-pyroxene andesite, hornblende-hypersthene andesite, hornblende andesite, hornblende dacite, rhyolite.
• It is constructed by lava flows that range in composition from basaltic andesite bordering on trachyandesite over dacite and smaller flows of partially silicic magma.
• The volcanic rocks of Bridgeman Island are formed by basaltic andesite and subalkaline basalt, and there is one questionable occurrence of dacite.
• Volcanic rocks include andesite and dacite with a porphyritic appearance and hornblende and plagioclase inclusions.
• The fell top is composed of dacite lava flows with the volcaniclastic sandstones and tuffs of the Blisco Member outcropping to the south.
• The dacite volcanic plugs, lava domes, intrusive sheets, and felsitic rhyolite-dacite between Morro Rock and Islay Hill are part of the Morro Rock-Islay Hill Complex of the Oligocene epoch (from 27 to 23 million years ago).
• 78 million years ago, built up much of the stratovolcano and consisted of trachyandesite, trachydacite, and dacite.
• During the Llanquihue glaciation Villarrica produced pyroclastic flow deposits, subglacial andesite lavas and dacite dykes.

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