Browsing ELibrary by Author "O'Reilly S.Y."
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Browsing ELibrary by Author "O'Reilly S.Y."
Now showing items 1-20 of 21
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Spetsius Z.V.; Belousova E.A.; Griffin W.L.; O'Reilly S.Y.; Pearson N.J. (2002)Zircon megacrysts from the Mir kimberlite, Yakutia, contain inclusions of chromite, chrome diopside, magnesian olivine, Ni-rich monosulfide solid solution and phlogopite. The mineral chemistry of the inclusion suite suggests ...
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Ionov D.A.; O'Reilly S.Y.; Genshaft Y.S.; Kopylova M.G. (1996)Carbonates of mantle origin have been found in xenoliths from Quaternary basaltic volcanoes in NW Spitsbergen. The carbonates range from dolomite to Mg-bearing calcite and have high Mg-numbers [Mg/(Mg+Fe)=(0.92–0.99)]. In ...
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Ionov D.A.; O'Reilly S.Y.; Dupuy C.; Kopylova M.G.; Genshaft Y.S. (1993)Peridotite xenoliths from basaltic volcanics in NW Spitsbergen contain carbonates of mantle origin. These occur as pockets of granular dolomite (Mg# 0.95–0.99) accompanied by fine-grained olivine and Al,Cr,Ti-rich clinopyroxene ...
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Griffin W.L.; Ryan C.G.; Fisher N.I.; Friedman J.; O'Reilly S.Y. (1999)Chrome-pyrope garnet is a minor but widespread phase in ultramafic rocks of the continental lithosphere; it complex chemistry preserves a record of events related to fluid movements in the mantle, including melt extraction ...
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Ionov D.A.; O'Reilly S.Y.; Ashchepkov I.V. (1996)Lherzolite xenoliths in Miocene to Pleistocene basalts from five sites in the Hamar-Daban range in southern Siberia provide sampling of the mantle close to the axis of the Baikal rift. These anhydrous spinel lherzolites ...
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Zheng J.; Griffin W.L.; O'Reilly S.Y.; Zhang M.; Pearson N.; Liou J.G. (2006)Granulite xenoliths from the Cretaceous-Paleogene Tuoyun basalts in the southwestern Tianshan area (NW China) are mainly pyroxene granulite and olivine granulite, with minor garnet granulite and quartz granulite. They can ...
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Porcelli D.R.; O'Nions R.K.; O'Reilly S.Y. (1986)The isotopic compositions of He and Sr have been obtained for suites of ultramafic xenoliths brought to the surface by Recent volcanic eruptions in continental environments. Samples include a range of petrologic types from ...
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Belousova E.A.; O'Reilly S.Y.; Griffin W.L.; Fisher N.I. (2002)Trace element abundances in igneous zircons, as determined by electron microprobe and laser-ablation microprobe ICPMS analysis, are shown to be sensitive to source rock type and crystallisation environment. The concentrations ...
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O'Reilly S.Y.; Griffin W.L. (2006)Suites of mantle-derived xenoliths in volcanic rocks provide estimates of the geothermal gradient and composition of the subcontinental lithospheric mantle (SCLM) at the time of the volcanic eruption. The development of ...
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Gaul O.F.; Griffin W.L.; O'Reilly S.Y.; Pearson N.J. (2000)The major-element composition of a grain of peridotitic Cr-pyrope garnet, coupled with a temperature estimate (TNi) derived from its Ni content, can be used to calculate the forsterite (Fo) content (100Mg/(Mg+Fe)) of the ...
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Alard O.; Griffin W.L.; Pearson N.J.; Lorand J.P.; O'Reilly S.Y. (2002)The Os isotopic compositions of mantle rocks generally are considered to be established during melt-depletion events and to be robust to subsequent disturbances (e.g. metasomatism). Consequently, Os isotopes are used to ...
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Ionov D.A.; O'Reilly S.Y.; Prikhodko V.S. (1995)Abundant spinel peridotite xenoliths occur in late Cenozoic alkali basaltic rocks in the Sikhote-Alin region at the Pacific margin of the Asian continent. Major- and trace-element compositions of representative peridotite ...
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Yu J.-H.; Xu X.; O'Reilly S.Y.; Zhang M.; Griffin W.L. (2006)This study characterizes the nature of fluid interaction and melting processes in the lithospheric mantle beneath the Yingfengling and Tianyang volcanoes, Leizhou Peninsula, South China, using in situ trace-element analyses ...
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Poudjom Djomani Y.H.; O'Reilly S.Y.; Griffin W.L.; Morgan P. (2001)This study uses information on composition, thermal state and petrological thickness to calculate the densities of different types of subcontinental lithospheric mantle (SCLM). Data from mantle-derived peridotite xenoliths ...
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Griffin W.L.; Shee S.R.; Pearson N.J.; Belousova E.; Jackson S.E.; Van Achterbergh E.; O'Reilly S.Y. (2000)Zircon megacrysts represent a late stage in the crystallisation of the magmas that produced the low-Cr megacryst suite (Ol+Opx+Cpx+Gnt+Ilm+Phl+Zir) found in many kimberlites, and may carry information on the sources of the ...
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Pearson N.J.; Griffin W.L.; Alard O.; O'Reilly S.Y. (2006)We have investigated detailed Mg isotopic variations in the lithospheric mantle by analysing olivine in mantle-derived peridotite xenoliths and megacrysts. High-precision in situ analyses of 26Mg/ 24Mg and 25Mg/24Mg are ...
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Zheng J.; Griffin W.L.; O'Reilly S.Y.; Zhang M.; Pearson N.; Luo Z. (2006)A suite of spinel peridotite xenoliths in Mesozoic basalts of the Tuoyun basin in the Tianshan area of northwest China has a high proportion of amphibole/mica-bearing lherzolites, with high Cpx/Opx ratios (mean 0.74). Many ...
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Griffin W.L.; O'Reilly S.Y.; Abe N.; Aulbach S.; Davies R.M.; Pearson N.J.; Doyle B.J.; Kivi K. (2003)The composition of the subcontinental lithospheric mantle (SCLM) varies in a systematic way with the age of the last major tectonothermal event in the overlying crust. This secular evolution in SCLM composition implies ...
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Beyer E.E.; Griffin W.L.; O'Reilly S.Y. (2006)Orogenic peridotites occur enclosed in Proterozoic gneisses at several localities in the Western Gneiss Region (WGR) of western Norway; garnet peridotites typically occur as discrete zones within larger bodies of garnet-free, ...
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Ionov D.A.; Griffin W.L.; O'Reilly S.Y. (1997)Amphibole (n = 11), mica (n = 16), apatite (n = 9) and clinopyroxene (n = 19) from mantle xenoliths in alkali basalts from Siberia, Mongolia and Spitsbergen were analysed for Rb, Sr, Ba, Y, Zr, Nb, Th, U, Pb, La, Ce by ...
Now showing items 1-20 of 21
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