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Now showing items 13882-13901 of 43490
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(2006)The Granadilla eruption at 600?ka was one of the largest phonolitic explosive eruptions from the Las Canadas volcano on Tenerife, producing a classical plinian eruptive sequence of a widespread pumice fall deposit overlain ...
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(Hokkaido University, 2014-09-22)The numerous of national and international publications were dedicated to Plosky Tolbachik volcano eruptions and adjacent monogenetic cones, which were erupted repeatedly during Holocene, including historical time [i.e. ...
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(2003)Dredged samples from the Geophysicist seamount volcano in the northeastern part of the Kurile Basin include volcanic and volcanoclastic rocks ranging from basalt to andesite. The rocks have geochemical features typical of ...
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(PANGAEA, 1995-05-19)
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(2006)Site 1201D of Ocean Drilling Program Leg 195 recovered basaltic and volcaniclastic units from the West Philippine Basin that document the earliest history of the Izu–Bonin–Mariana convergent margin. The stratigraphic section ...
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(2006)Deerite, a typical mineral of Fe-rich metacherts metamorphosed under blueschist conditions, is not rare, but known occurrences have up to now been restricted mainly to the Tethyan collisional zone and the Western Cordillera ...
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(2006)Here new mineralogical data is presented on the occurrence of K-feldspar in granulite-facies metagabbronorite xenoliths found in recent alkaline lavas from Western Sardinia, Italy. The xenoliths originated from the ...
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(2004)Amoeboid olivine aggregates (AOAs) are irregularly shaped, fine‐grained aggregates of olivine and Ca, Al‐rich minerals and are important primitive components of CR chondrites. The AOAs in CR chondrites contain FeNi metal, ...
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(2004)The basaltic Martian meteorite Yamato 980459 consists of large olivine phenocrysts and often prismatic pyroxenes set into a fine-grained groundmass of smaller more Fe-rich olivine, chromite, and an interstitial residual ...
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(2006)The Carboniferous volcanic rocks occurring in western Tianshan Mountains range continuously from basalt, basaltic trachyandesite, trachyandesite, trachyte, to rhyolite. The isotopic compositions are variable for Carboniferous ...
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(2015)Abstract We report petrography, and bulk rock, mineral and glass analyses of eruptive products of the 2012–13 eruption of Tolbachik volcano, Central Kamchatka Depression, Russia. Magmas are shoshonitic in composition, with ...
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(2014)We report the petrology, whole-rock geochemistry, zircon LA-ICP-MS U–Pb chronology and zircon Hf isotopic data of Daxigou granitoids (western part of the Kuluketage Block, NW China) to evaluate their likely petrogenesis ...
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(1996)In the central Vetreny Belt, southeastern Baltic Shield, an areally extensive 110 m deep lava lake is exposed consisting of remarkably fresh differentiated komatiitic basalt. During eruption, the liquid had a temperature ...
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PETROLOGY OF A LOWER CRUSTAL XENOLITH SUITE FROM DIKES AND EXPLOSION PIPES OF THE KANDALAKSHA GRABEN (2001)The lower crustal xenolith suite contained in alkaline-ultramafic dikes and the explosion pipes of the Kandalaksha graben, northwestern Belomorie, consists of Grt granulites (Grt-Cpx-Pl ± Qtz), two-feldspar Grt granulites ...
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(2000)The megacryst assemblage of Pliocene-Quaternary basanites from the Vitim Plateau comprises clinopyroxene, garnet, ilmenite, Ti-magnetite, biotite, and K-Na-feldspar megacrysts. This assemblage also includes large aggregates ...
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(1997)Bulk compositions acquired by neutron activation analysis are reported for eight Allende dark inclusions (DIs) and compared with compositions of five DIs previously reported in the literature. Enrichments of the elements ...
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(1997)Geological and petrological features of Quaternary volcanic rocks from Bogdan Khmelnitskiy Volcano were used, along with the results of a mass balance calculation, detailed mineralogy, and crystal size distribution, to ...
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(1998)The subaqueous explosive eruption on January 2-3, 1996, produced tephra of predominantly aluminous calc-alkaline basalt composition. The rocks have a moderate alkalinity and an essential mineral assemblage of olivine, ...
Now showing items 13882-13901 of 43490