نتایج جستجو برای: quartz schist

تعداد نتایج: 12669  

2003
WILLIAM B. BULL

The Nahal Yael basin is underlain chiefly by schist, amphibolite, and granite. Thin (generally < 1 m thick), grussy colluvium which covered the lower portions of granitic hillslopes in the late Pleistocene has now been stripped completely, causing marked contrasts in outcrop morphologies, even where there is no contrast of fracture density or petrologic characteristics. Formerly mantled slopes ...

Journal: :Geochemistry Geophysics Geosystems 2022

The Arosa Zone, Central Alps, represents a Cretaceous to Paleogene fossil subduction interface from paleodepths of 10 >35 km. Metasedimentary schists directly below preserved seismogenic zone exhibit viscous (foliations, folds, and lineations) brittle (crack-seal quartz ± calcite veins) deformation features. Si-in-phengite barometry published temperature estimates yield metamorphism conditions ...

Journal: :Arabian Journal of Geosciences 2022

Abstract New investigations of petrographic and geochemical characteristics Mesozoic sandstones from the northwestern Gulf Suez in Egypt have been undertaken, documenting dominance quartzose containing on average ~ 5% mostly sedimentary subordinately metamorphic lithic fragments (siltstone, sandy siltstone, and, more rarely slate, metasiltstone, limestone, dolostone, quartz-muscovite schist, gn...

حاجی‌میرزاجان, حسین, حیدریان ‌شهری, محمدرضا, ملکزاده شفارودی, آزاده, همام, سید مسعود,

Dehzaman iron deposit is located southwest of Bardaskan, Khorasan Razavi province, and northeast of Kashmar-Kerman Tectonic Zone. Geology of the study area consists of late-Neoprotrozoic-lower Cambrian metamorphsed volcano-sedimentary units, including slate- phyllite, sericite schist, recrystallized carbonate rocks, metarhyolite-metarhyodacite and granitic intrusions. Mineralization is hosted b...

Journal: :Geochemistry Geophysics Geosystems 2021

Constraining conditions and mechanisms of the early stages exhumation from within subduction zones is challenging. Although pressure, temperature, age can be inferred exhumed rock record, it generally difficult to derive each these parameters any single rock, thus demanding assumptions that diverse data multiple samples safely combined into a pressure-temperature-time (P-T-t) path might then us...

Journal: :Journal of the Geological Society of Japan 2022

An exotic block of garnet-bearing schist has been found at the boundary between Early Triassic Takinosawa Unit Nedamo Belt and Jurassic Nakatsugawa Complex North Kitakami Belt, NE Japan. This is only second discovery schists in Belt; previously identified occur early Carboniferous Tsunatori units Belt. The characterized by a mineral assemblage garnet + phengite epidote albite quartz titanite. P...

جهانگیری, احمد, مجتهدی, منصور,

Microscopic and XRD investigations indicate that the main mica is phlogopi!e. There are also a small amounl of Muscovi!e in Ihe eas! pan. Trend of mica layers is NE-SW. Host rocks arc Gneiss, mi::.;!schist S, granite and gabbro. Minerals assemblage of this mine is phlogopitc, apatite and calcite. Chemical and microscopical in vestiga tions of granite indicate that they are nonorogen alkal...

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