نتایج جستجو برای: dunite

تعداد نتایج: 231  

Journal: :European Journal of Mineralogy 2021

Abstract. Melt transport mechanisms have an important impact on the chemical composition of percolated host rock and migrating melts. migration is usually assumed to occur at grain boundaries. However, microstructural studies revealed occurrence polyphase inclusions along dislocations, subgrain boundaries microcracks in single mineral grains. The are interpreted as crystallized melt pockets sug...

Journal: :Journal of Petrology 2021

Abstract Peridotite–magma interaction is important in establishing magma pathways through the mantle and metasomatism of lithospheric mantle. Reactions that consume orthopyroxene produce olivine clinopyroxene are particular interest because these reactions should lead to a redistribution trace elements between solid melt phases at equilibrium. This study examines silica-undersaturated alkaline ...

Journal: :Earth, Planets and Space 2023

Abstract The mapping of available water–ice is a crucial step in the lunar exploration missions. Ground penetrating radars have potential to map subsurface structure and existence terms electromagnetic properties, specifically, permittivity. Slight differences permittivity can be significantly important when applied dry environment, such as on Moon Mars. capability detecting small fraction puta...

رحیم زاده, بهمن , شیرزادی, علیرضا , مسعودی, فریبرز ,

Significance of chromite, as the unique source for chromium, a metal with key role in industry, has inspired many geologists to investigate its genesis and natural distribution as an important contribution to its exploration in many parts of the world. To do this, geochemistry of chromite, which is considered to be the reflection of the nature of its parent magma and the geotectonic setting in ...

Journal: :Bulletin of The Geological Society of Finland 2022

Several mafic-ultramafic layered intrusions were emplaced in the NE Fennoscandian Shield during a magmatic episode at 2.44 Ga. The Paleoproterozoic Näränkävaara intrusion, northern Finland, is one of largest ultramafic bodies Shield, with surface area 25 km x 5 and stratigraphic thickness ~3 km. intrusion comprises 1.3 km-thick peridotitic–dioritic series (2436 ± Ma) two peridotitic reversals, ...

Journal: :Minerals 2023

The irregular and sporadic occurrence of chromite pods in podiform deposits (PCD), especially mountainous terranes with rough topography, necessitates finding innovative methods for reconnaissance prospecting. This research combines several remote sensing to discriminate the highly serpentinized peridotites hosting from other barren ultramafic mafic cumulates. case study is area Sabzevar Ophiol...

Journal: :Minerals 2022

The Dinaride Ophiolite Belt formed from the Jurassic part of Neotethys. investigated Ozren ophiolite complex in Bosnia and Herzegovina consists peridotites, plagioclase plagiogranites, troctolites other gabbroic rocks, fewer basalts. Lherzolites harzburgites contain corroded ortho- clinopyroxene1 porphyroclasts enclosed olivine matrix. boundaries between aggregates pyroxene1 spinel1 are infille...

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