Results 41 to 50 of about 43,981 (268)

Creep of dry clinopyroxene aggregates [PDF]

open access: yesJournal of Geophysical Research: Solid Earth, 2001
We have determined diffusional and dislocation creep rheologies for clinopyroxenite Ca1.0Mg0.8Fe0.2Si2O6 under dry conditions by deforming natural and hot‐pressed samples at confining pressures of 300–430 MPa and temperatures of 1100°–1250°C with the oxygen fugacity buffered by either nickel‐nickel oxide or iron‐wüstite powders.
Misha Bystricky, Stephen Mackwell
openaire   +1 more source

Adiabat_1ph: A new public front-end to the MELTS, pMELTS, and pHMELTS models [PDF]

open access: yes, 2005
The program adiabat_1ph is a simple text-menu driver for subroutine versions of the algorithms MELTS, pMELTS, and pHMELTS [Asimow et al., 2004; Ghiorso et al., 2002; Ghiorso and Sack, 1995].
Asimow, Paul D., Smith, Paula M.
core   +1 more source

The Late- Cretaceous volcanic rocks from Talesh area (western Alborz): chemical variation, crystallization condition, hygrometry and tectonic setting [PDF]

open access: yesپترولوژی, 2020
In the Talesh area (western Alborz), a thick sedimentary- volcanic association formed in a littoral- deltaic environment during the Late Cretaceous. The extrusives comprise volcanoclastics (tuffs), lava flows (pillow and massive) and basic dykes.
Khadijeh Amani   +3 more
doaj   +1 more source

Symplectite and kelyphite formation during decompression of mafic granulite from Gjelsvikfjella, central Dronning Maud Land, Antarctica [PDF]

open access: yesEuropean Journal of Mineralogy, 2023
Central Dronning Maud Land (cDML) is part of the late Mesoproterozoic Maud Belt in East Antarctica, which was metamorphosed and deformed during the Ediacaran–Cambrian Gondwana assembly. Here we study high-pressure (HP) mafic rocks in Gjelsvikfjella, cDML,
S. Elvevold   +5 more
doaj   +1 more source

The origin of alteration “orangettes” in Dhofar 019: Implications for the age and aqueous history of the shergottites [PDF]

open access: yes, 2017
The shergottites are the largest group of Martian meteorites, and the only group that has not been found to contain definitive evidence of Martian aqueous alteration.
Hallis, L.J.   +3 more
core   +1 more source

BONINITES AS A CRITERION FOR THE GEODYNAMIC DEVELOPMENT OF MAGMATIC SYSTEMS IN PALEOSUBDUCTION ZONES IN GORNY ALTAI

open access: yesГеодинамика и тектонофизика, 2018
Ancient primary boninitic melts of the Gorny Altai (65–105 km, 1410–1590 °C) were studied from the composition of melt inclusions in clinopyroxenes.
A. V. Kotlyarov   +2 more
doaj   +1 more source

Clinopyroxene/Melt Trace Element Partitioning in Sodic Alkaline Magmas

open access: yesJournal of Petrology, 2019
Clinopyroxene is a key fractionating phase in alkaline magmatic systems, but its impact on metal enrichment processes, and the formation of REE + HFSE mineralisation in particular, is not well understood.
C. Beard   +3 more
semanticscholar   +1 more source

The Origin and Significance of Reverse Zoning in Melilite from Allende Type B Inclusions [PDF]

open access: yes, 1984
In many Type B Allende inclusions, melilite is reversely-zoned over restricted portions of each crystal. Textural relationships and the results of dynamic crystallization experiments suggest that the reverselyzoned intervals in these Type melilites ...
Grossman, Lawrence   +3 more
core   +1 more source

Temperature effects on the 15-85-micron spectra of olivines and pyroxenes [PDF]

open access: yes, 2001
Far-infrared spectra of laboratory silicates are normally obtained at room temperature even though the grains responsible for astronomical silicate emission bands seen at wavelengths >20 micron are likely to be at temperatures below ~150 K.
A. M. Hofmeister   +7 more
core   +2 more sources

A micro-analytical approach to partition coefficients in plagioclase and clinopyroxene of basaltic sills in Serra Geral Formation, Paraná Basin, Brazil

open access: yesBrazilian Journal of Geology
: In the present study, detailed micro-analytical data (major and trace elements) in minerals from sills of Serra Geral Formation represents the first attempt to evaluate the partition coefficient of Sc, Ti, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Mo ...
Leonardo Cardoso Renner   +4 more
doaj   +1 more source

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