نتایج جستجو برای: felsic pegmatite
تعداد نتایج: 1138 فیلتر نتایج به سال:
Fluid inclusions (FIs) and associated solids in host minerals garnet, tourmaline, spodumene, quartz from six pegmatite fields of Permian origin at Koralpe (Eastern Alps) have been investigated. Although pegmatites suffered intense Eoalpine high-pressure metamorphic overprint during the Cretaceous period, studied samples originate rock sections with well-preserved magmatic textures. Magmatic low...
The petrogenesis of the world famous Koktokay No. 3 pegmatite in Chinese Altai Mountains is still enigmatic due to its superenrichment rare metals and apparent absence a parental granite. We present results from granite apophysis that was recently discovered open pit. Results show it has low K/Rb (32.35−38.76), Zr/Hf (13.78−23.30), Nb/Ta (1.00−6.02), extremely K2O/Na2O (0.12−0.20) ratios, which...
Abstract The mechanical properties of the deep rock are impacted not only by complicated stress environment but also mineral composition. To reveal relationship between development characteristics and acoustic emission signals in evolution rocks, metagabbros with different feldspar were subjected to tests under hydraulic coupling. characteristic parameter their correlation investigated. results...
The ChemCam instrument, which provides insight into martian soil chemistry at the submillimeter scale, identified two principal soil types along the Curiosity rover traverse: a fine-grained mafic type and a locally derived, coarse-grained felsic type. The mafic soil component is representative of widespread martian soils and is similar in composition to the martian dust. It possesses a ubiquito...
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...
In the Palaeoproterozoic Nagssugtoqidian orogen of West Greenland reworked Archaean and juvenile Proterozoic orthogneisses occur side by side and are difficult to differentiate in the field. Archaean gneisses have tonalitic to trondhjemitic compositions with relatively low Al2O3 and Sr, and may have been derived from magmas formed by melting of basaltic or amphibolitic rocks at moderate pressur...
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