Information om | Engelska ordet ANDESITE

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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.
• It has a fine-grained (aphanitic) to porphyritic texture and is intermediate in composition between andesite and rhyolite.
• Numerous pyroclastic cones dot the lower flanks of basaltic to basaltic andesite volcano, particularly on the NW and SE sides, including an offshore cone formed during the 1933–34 eruption.
• Consisting of basaltic andesite, andesite, and dacite, the mountain has been extensively altered by glacial erosion.
• Despite its similarity to Rodley Butte, both in age and original composition, Bailey switched from erupting basaltic andesite to andesite.
• Andesite and basaltic andesite are the most abundant volcanic rock in island arc which is indicative of the calc-alkaline magmas.
• 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.
• Made mostly of mafic (rich in magnesium and iron) volcanic rock like subalkaline basalt and basaltic andesite, it has a volcanic plug occupying its summit cone and numerous dikes.
• The series which is up to 1000 metres (3000') thick also includes trachyte, dolerite and skomerite which is an altered andesite.
• For example, porphyritic andesite will have large phenocrysts of plagioclase in a fine-grained matrix.
• Volcanism resumed as evidenced by the Late Cretaceous Tutu Formation, consisting of volcaniclastic turbidites, basalt, and andesite.
• The cliffs' rocks were originally formed 12 to 13 million years ago during the Miocene Epoch due to various volcanic activities, and were created by magma mixing with sedimentary rock to form columnar joints of pyroxene andesite containing Plagioclase crystals, Augite and Enstatite crystals in pentagonal or hexagonal shapes, which has been eroded by the sea.
• The east slope of the range forms the footwall of the Lode, and is composed of diorite, while the hanging wall is composed of andesite, which the miners called "porphyry".
• The 4 mile wide volcano is characterized by a Cretaceous quartz monzonite stock within a topographic depression, surrounded by surface andesite flows at least 2,300 feet thick, and radial quartz latite or rhyolite dikes.
• Mount Tongariro is part of the Tongariro volcanic centre, which consists of four massifs made of andesite: Tongariro, Kakaramea-Tihia Massif, Pihanga,.
• 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.
• Diopside is found in ultramafic (kimberlite and peridotite) igneous rocks, and diopside-rich augite is common in mafic rocks, such as olivine basalt and andesite.
• 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.
• Ulleungdo is a volcanic island that rose from the seabed during the Cenozoic period, and consists of trachyte, andesite, and basalt.

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