نتایج جستجو برای: prograde metamorphism

تعداد نتایج: 2624  

Journal: :Geoscience frontiers 2023

The processes leading to the assembly of Rodinia supercontinent through Grenvillian collisional orogeny are relatively well known. In contrast, accretionary orogenic occurring at periphery following poorly understood. To fill this gap, we have identified metamorphic rocks in Mongolia collage Central Asian Orogenic Belt, where numerous data testify for Meso- Neoproterozoic magmatic reworking. te...

ترابی, قدرت,

Amphibolites are one of the metamorphic rock units of Jandaq ophiolite and exposed in a considerable volume. These rocks are metamorphism products of basalts, pillow lavas and diabasic dikes of Jandaq ophiolite. Amphibolites contain amphibole, plagioclase, garnet, alkali feldspar (orthoclase), magnetite, biotite, muscovite, sphene, quartz, epidote and calcite minerals. These rocks contain very ...

Journal: :Geological Magazine 1895

Journal: :Journal of Petrology 2022

Abstract As one of the widest terranes exposed in icy Antarctica, Larsemann Hills Prydz Bay belt preserves diverse rock types with a complex metamorphic history and thus is critical to tectono-metamorphic evolution East Antarctica. Garnet-sillimanite-spinel-cordierite-bearing garnet-orthopyroxene-bearing granulites are typical rocks region. Phase equilibrium modelling mineral thermometry based ...

2008
Hilke E. Schlichting

With the discovery of Kuiper Belt binaries that have wide separations and roughly equal masses new theories were proposed to explain their formation. Two formation scenarios were suggested by Goldreich and collaborators: In the first, dynamical friction that is generated by the sea of small bodies enables a transient binary to become bound (Ls mechanism); in the second, a transient binary gets ...

2010
A. Cartwright

Context. The fidelity of smoothed particle hydrodynamics (SPH) simulations of accretion disks depends on how artificial viscosity (AV) is formulated. Aims. We investigate whether standard methodology is reliable in this regard. Methods. We test the operation of two methods for selective application of AV in SPH simulations of Keplerian accretion disks, using a ring spreading test to quantify ef...

Journal: :Proceedings of the International Astronomical Union 2016

زنگنه قاسم آبادی, محسن, بومری, محمد , بیابانگرد , حبیب الله ,

Keybarkuh Skarn is located in southwest of Khaf and northeast of Lut block in the Razavi Khorasan Province. Cretaceous limestone in the study area was intruded by granitoid plutons and as a result the skarn and related iron minerals were formed. The most important minerals in Keybarkuh skarn are garnet (andradite-grussolar), clino-pyroxine (diopsid – hedenbergite), amphibole, epieote, magnetite...

مرادیان, عباس, احمدی‌پور, حمید , پیغمبری, سیما ,

Tanbour metamorphic complex east of Sirjan is compoused of metasediments and metabasic rocks. Petrofabric study of this complex shows two metamorphic and two deformational phases. Chemical studies of index minerals indicate that second phase of metamorphism occurred with a degree up to lower amphibolite facies. Mineral assemblage of first phase are biotite, muscovite and garnet while staurolite...

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