Results 121 to 130 of about 188 (175)

Mantle oxidation by sulfur drives the formation of giant gold deposits in subduction zones. [PDF]

Proc Natl Acad Sci U S A
He DY, Qiu KF, Simon AC, Pokrovski GS, Yu HC, Connolly JAD, Li SS, Turner S, Wang QF, Yang MF, Deng J.   +10 more
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Origin of Oshima-Oshima and other picrites

, 1998
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VIII.—The Petrology of Picritic Rocks in Minor Intrusions—a Picrite Sill on the Island of Soay (Hebrides)

Transactions of the Royal Society of Edinburgh, 1962
SynopsisA Small picrite sill of critical significance is examined in detail, from top to bottom, with particular reference to the distribution and crystallization of the olivine. Statistical evaluation of the sizes of olivine crystals establishes a gradation from large phenocrysts to small groundmass crystals.
Wyllie, P. J., Drever, H. I.
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The mantle origins of Karoo picrites

Earth and Planetary Science Letters, 1991
Karoo picrites are divided into a volumetrically dominant high Ti-Zr (HTZ) group and a less abundant low Ti-Zr (LTZ) group. Distinguished in this way, it is then possible to use the comparison of major element compositions with those of experimentally determined partial melts of mantle peridotites to constrain the depth of segregation for each magma ...
R.J. Sweeney, T.J. Falloon, D.H. Green, Y. Tatsumi   +3 more
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Modelling the ascent of picritic lunar magmas

2021
<p>Quantifying the volatile content of the lunar interior is valuable for understanding the formation, thermal evolution, and magmatic evolution of the Earth and Moon. Petrological modelling and geochemical measurements have been used to study the volatile composition of the lunar interior.
Marissa Lo, Giuseppe La Spina, Katherine Joy, Margherita Polacci, Mike Burton   +4 more
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Stabiliser degradation in picrite propellants

Journal of Applied Chemistry, 1960
AbstractPicrite propellants (N, NQ, SPCG) were artificially aged at 65° and the rate and manner of decomposition were followed by separation and analyses of the products derived from the stabiliser due to its combination with nitrogen oxides. An SC formulation which does not contain picrite was treated in a similar manner.The total amount of ...
Paul E. Gagnon, R. MaCdonald, C. Haggart, J. L. Myers   +3 more
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Picritic glasses from Hawaii

Nature, 1991
ESTIMATES of the MgO content of primary Hawaiian tholeiitic melts range from 8wt% to as high as 25wt%. In general, these estimates are derived from analysis of the whole-rock composition of lavas, coupled with the compositions of the most magnesian olivine phenocrysts observed. But the best estimate of magma composition comes from volcanic glass, as it
Clague, David A., Weber, William S., Dixon, Jacqueline E.   +2 more
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CO2 and the eruptibility of picrite and komatiite

Lithos, 1995
Abstract A tholeiitic picrite erupted from the summit region of Kilauea volcano, Hawaii in 1959. Work by Wright, Helz and Schwindinger and Anderson shows that the 1959 magma was a mixture of new, hot, MgO-rich magma that rose through and mixed with cooler stored magma causing crystallization of abundant olivine phenocrysts.
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186Os–187Os systematics of Hawaiian picrites

Earth and Planetary Science Letters, 1999
Abstract Primitive Hawaiian picrites have 187Os/188Os as high as ∼0.145 and are more radiogenic than the depleted upper mantle, reflecting a time-integrated suprachondritic Re/Os ratio. The high Re/Os may be explained either by an ancient recycled crustal component or an evolved outer core component in the Hawaiian plume.
Alan D. Brandon, Marc D. Norman, Richard J. Walker, John W. Morgan   +3 more
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Komatiites and picrites: evidence that the ‘plume’ source is depleted

Earth and Planetary Science Letters, 1994
High-temperature magmas such as picrites and komatiites are candidates for the material in the hot axial region of mantle plumes. In current plume theories these magmas should have an enriched ocean-island basalt (OIB) type chemistry. High MgO magmas, however, are often more like depleted mid-ocean ridge basalts (MORB) in trace element and isotopic ...
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