The Pelona, Orocopia, and Rand Schists and the schists of Portal Ridge and Sierra de Salinas constitute a high–pressure-temperature terrane that was accreted beneath North American basement in Late Cretaceous–earliest Tertiary time. The schists crop out in a belt extending from the southern Coast Ranges through the Mojave Desert, central Transverse Ranges, southeastern California, and southwest...

The abundant phyllosilicate and carbonate minerals characterizing most of the returned particles from asteroid Ryugu suggest a history extensive aqueous alteration on its parent body, similar to rare mineralogically altered, but chemically primitive, CI (Ivuna-type) chondrite meteorites. Particle C0009 differs other examined so far by containing anhydrous silicates at level ~0.5 vol%, thus can ...

Abstract Most tungsten (W) and tin (Sn) deposits are associated with highly evolved granites derived from the anatexis of metasedimentary rocks. They commonly separated in both space time, rare cases where W Sn mineralization part a single deposit, two metals temporally separate. The factors controlling this behavior, however, not well understood. Our compilation whole-rock geochemical data for...

Abstract Eclogites represent the highest pressure conditions yet observed from rocks thrust to surface in central Himalaya. A detailed investigation of protolith nature these eclogites is needed better understand pre-Himalayan geological history. Retrogressed were collected Thongmön (Dingri County) and Riwu (Dinggye County), Himalaya, China. We investigated bulk rock major trace elements, Sr-Nd...

Geochemical changes and authigenic clays were detected in the fault rocks of Padul Fault. An enrichment from protolith to ultracataclasites Si, Al, Fe, Ca, Ti also Zn but an impoverishment Mg was detected. Although (dolostones) are mostly composed carbonates, characterized by presence fine-grained matrix (mainly chlorite Mg-rich biotite, smectite punctually talc). Neither nor talc protolith. Th...

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U-Pb and Hf isotope analyses of zircons from felsic granulite xenoliths in Mesozoic volcanics reveal Early Archean ($3.6 Ga) lower crust beneath the younger (,2.85 Ga) southern margin of the North China craton, and suggest that the eastern part of the craton formed a coherent block by 3.6 Ga. Hf model ages indicate extraction of protoliths from the mantle ca. 4 Ga or earlier, followed by remelt...

Findings of coesite and microdiamond in metamorphic rocks of supracrustal protolith led to the recognition of continental subduction to mantle depths. The crust-mantle interaction is expected to take place during subduction of the continental crust beneath the subcontinental lithospheric mantle wedge. This is recorded by postcollisional mafic igneous rocks in the Dabie-Sulu orogenic belt and it...

[1] Ultramafic xenoliths of spinel dunite, harzburgite, lherzolite, amphibole/phlogopite-bearing pyroxenite, and clinopyroxenite occur in andesitic pyroclastic debris from the 1964 eruption of Shiveluch volcano, Kamchatka. Peridotites have coarse/protogranular, porphyroclastic, and granuloblastic textures, abundant kink-banded olivine, and refractory mineral compositions with forsteritic olivin...