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Now showing items 10528-10547 of 39124
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(1990)To elucidate the origin of clinopyroxenites and melanocratic gabbros, which generally form annular rims around the dunite 'cores' of the plutons, and of their paragenetic association with the dunites, it is important to ...
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(1999)Compact type A (CTA) inclusions are one of the major types of coarse-grained refractory inclusions found in carbonaceous chondrites. They have not been studied in a systematic fashion, leading to some uncertainties and ...
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(2001)A kerogen, termed aBS base, from the Gorodische section (Russian Platform) was studied using a combination of microscopic, spectroscopic and pyrolytic methods in order to determine its chemical structure, source organisms ...
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(2004)The average crystal structures of two natural porous titanosilicates of the labuntsovite group, lemmleinite-Ba and lemmleinite-K, ideally Na4K4Ba2Ti8(Si4O 12)4O4(OH)4·8H 2O and Na4K4K2Ti 8(Si4 O12)4O 2(0H)6·8H2O, respectively, ...
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(2005)Lherzolite–wehrlite (LW) series xenoliths from the quaternary Tok volcanic field in the southeastern Siberian craton are distinguished from the more common lherzolite–harzburgite (LH) series by (a) low Mg numbers (0.84–0.89) ...
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(PANGAEA, 2009-10-25)The origin of friable sediments blanketing the Barents Sea shelf is considered. It is shown that their characteristic seismoacoustic record patterns reflect low degree of diagenetic transformations and indicates continuous ...
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(1989)Garnet is rather common in intermediate and silicic plutonic igneous rocks but rare in volcanic rocks, particularly those of mafic composition. Finds of garnet of igneous origin are of great interest because they are a ...
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(1999)In the Bashkir mega-anticline (western Urals) stratabound magnesite, siderite, fluorite and base-metal deposits are hosted by a sequence of Riphean sediments with a thickness of more than 12 km. The giant deposits of ...
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(2004)The occurrence of graphite-coated microdiamonds is a characteristic feature of ultrahigh-pressure metamorphic rocks. Nonetheless, their tiny dimension was an insurmountable obstacle for the study of these aggregates for a ...
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(1995)The composition and amounts of fluids strongly affect phase relations near the liquidus of Group 1A kimberlites. Under CO2-saturated conditions olivine disappears from the liquidus at 45 kbar and orthopyroxene, garnet and ...
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(PANGAEA, 2008-09-04)Data are presented on content and composition of hydrocarbons (HC) (aliphatic AHC and polyaromatic PAH) in filtered particulate matter and in the surface layer of bottom sediments from the northern shelf of the Caspian Sea ...
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(1989)The authors describe silicate inclusions in chromian spinels and syngenetic platinum minerals from the alpinotype ultramafic rocks of the Koryak Highlands and the alkalic-ultramafic plutons of the Aldan Shield. Both of ...
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(2004)Most hypotheses about the origin of kimberlites explain the specific composition of the rocks (high content of incompatible elements, mainly, LREE) by the low degree of partial melting of the lithospheric mantle during ...
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(1993)A coal-bed wax was fractionated and analyzed using capillary column GC and combined GC/MS. It was found that the major components in the wax were n-alkanes (55.6%), cyclic/branched alkanes (26.0%), and several homologous ...
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ORIGIN OF LOW-CA PYROXENE IN AMOEBOID OLIVINE AGGREGATES: EVIDENCE FROM OXYGEN ISOTOPIC COMPOSITIONS (2005)Amoeboid olivine aggregates (AOAs) in primitive carbonaceous chondrites consist of forsterite (Fa<2), Fe,Ni-metal, spinel, Al-diopside, anorthite, and rare gehlenitic melilite (Åk<15). ~10% of AOAs contain low-Ca pyroxene ...
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(2002)Edingtonite and yugawaralite showing sectoral textures were studied by polarized optical microscopy and X-ray analysis. In edingtonite, the m{110} sector (2Vα = 22°) is optically triclinic and the c{001} sector (2Vα = 52°) ...
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(2000)Phase equilibria experiments on an Apollo 14B green glass composition are used to develop a petrogenetic model for the Apollo 14B green glasses. New compositional data for the Apollo 14B green glasses are presented, which ...
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(1997)Magnetite in the oxidized CV chondrite Allende mainly occurs as spherical nodules in porphyritic-olivine (PO) chondrules, where it is associated with Ni-rich metal and/or sulfides. To help constrain the origin of the ...
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(Федеральное государственное бюджетное учреждение науки Институт земной коры Сибирского отделения Российской академии наук, 2017)
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(The Volcanological Society of Japan, 2015-09-28)
Now showing items 10528-10547 of 39124