Browsing ELibrary by Author "O'Reilly S.Y."

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ARCHEAN SULFIDE INCLUSIONS IN PALEOZOIC ZIRCON MEGACRYSTS FROM THE MIR KIMBERLITE, YAKUTIA: IMPLICATIONS FOR THE DATING OF DIAMONDS

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 ...
CARBONATE-BEARING MANTLE PERIDOTITE XENOLITHS FROM SPITSBERGEN: PHASE RELATIONSHIPS, MINERAL COMPOSITIONS AND TRACE-ELEMENT RESIDENCE

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 ...
CARBONATED PERIDOTITE XENOLITHS FROM SPITSBERGEN: IMPLICATIONS FOR TRACE ELEMENT SIGNATURE OF MANTLE CARBONATE METASOMATISM

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 ...
CR-PYROPE GARNETS IN THE LITHOSPHERIC MANTLE. I. COMPOSITIONAL SYSTEMATICS AND RELATIONS TO TECTONIC SETTING

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 ...
FELDSPAR-BEARING LHERZOLITE XENOLITHS IN ALKALI BASALTS FROM HAMAR-DABAN, SOUTHERN BAIKAL REGION, RUSSIA

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 ...
HELIUM AND STRONTIUM ISOTOPES IN ULTRAMAFIC XENOLITHS

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 ...
IGNEOUS ZIRCON: TRACE ELEMENT COMPOSITION AS AN INDICATOR OF SOURCE ROCK TYPE

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 ...
MAPPING OLIVINE COMPOSITION IN THE LITHOSPHERIC MANTLE

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 ...
NEW INSIGHTS INTO THE RE-OS SYSTEMATICS OF SUB-CONTINENTAL LITHOSPHERIC MANTLE FROM IN SITU ANALYSIS OF SULPHIDES

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 ...
PERIDOTITE XENOLITHS IN ALKALI BASALTS FROM THE SIKHOTE-ALIN, SOUTHEASTERN SIBERIA, RUSSIA: TRACE-ELEMENT SIGNATURES OF MANTLE BENEATH A CONVERGENT CONTINENTAL MARGIN

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 ...
THE DENSITY STRUCTURE OF SUBCONTINENTAL LITHOSPHERE THROUGH TIME

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 ...
THE HF ISOTOPE COMPOSITION OF CRATONIC MANTLE: LAM-MC-ICPMS ANALYSIS OF ZIRCON MEGACRYSTS IN KIMBERLITES

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 ...
THE ORIGIN AND EVOLUTION OF ARCHEAN LITHOSPHERIC MANTLE

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 ...
VOLATILE-BEARING MINERALS AND LITHOPHILE TRACE ELEMENTS IN THE UPPER MANTLE

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 ...

Browsing ELibrary by Author "O'Reilly S.Y."

Browsing ELibrary by Author "O'Reilly S.Y."

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