نتایج جستجو برای: piemontite quartz schist

تعداد نتایج: 12676  

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...

Journal: :IOP conference series 2023

Abstract The Kawatuna area has a complex geological structure condition and is estimated to be weak zone for hydrothermal solutions rise then accumulate into deposits in the form of veins. Based on this, it makes this interesting study. This study aims determine its influence distribution veins area. method used surface mapping structures analysis. mapping, was found that composed schist rock u...

Journal: :International journal of geography, geology and environment 2022

This study presents lithologic and petrogenetic investigation of bedded quartzite from Okemesi massive quartzites Ado-Ekiti in southwestern Nigeria. is extensive, thickly steeply dipping while hummocky, ferruginous, fractured, non-bedded. Analytical results reveal average SiO2 (94.74 %) (93.88%). Similarly, Rb/Sr are 0.74 1.22 Sr/Ba 0.89 0.69, respectively. These parameters portray them as supr...

2017
Nicholas R. J. Goodwin Ray Burgess Dave Craw Damon A. H. Teagle Chris J. Ballentine

The world-class Macraes orogenic gold deposit (∼10Moz resource) formed during the late metamorphic uplift of a metasedimentary schist belt in southern New Zealand. Mineralising fluids, metals and metalloids were derived from within the metasedimentary host. Helium and argon extracted from fluid inclusions in sulphide mineral grains (three crush extractions from one sample) have crustal signatur...

M. Jamshidi Badr

Soursat Metamorphic Complex (SMC) in west of Takab city is one of the polyphase metamorphic terrenes in northern Sanandaj-Sirjan metamorphic belt of Iran. The SMC composed mainly of metasedimentary rocks associated with granitic intrusions. Based on metamorphic rocks, two metamorphic phases could be separate in the complex. M1 is representative of regional metamorphisms which varies from greens...

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