Trace Elements in Muscovite as a Guide to Gem Tourmaline Bearing Pegmatites in Nepal
نویسندگان
چکیده
منابع مشابه
بررسی سنگ‌شناسی و ژئوشیمی دایک‌های مافیک و فلسیک مجموعه پلوتونیک الوند- همدان و بررسی شیمی کانی‌های موجود در آنها
The Alvand plutonic complex is composed of various plutonic rocks, mafic and felsic dikes (pegmatites and aplites). Pegmatites and aplites consist of quartz, feldspar, mica, tourmaline, garnet and allanite. Based on the mineralogycal compound, pegmatites can be divided into tourmaline-garnet-muscovite-bearing, aluminosilicate-bearing and tourmaline-bearing pegmatites and aplites are composed of...
متن کاملMineralogy and geochemistry of pegmatitic dykes in the Boroujerd-Nezam Abad zone with respect to trace and rare earth elements mineralization
Boroujerd-Nezam Abad zone widespread along NW-SE trend in part of Sanandaj-Sirjan zone. Borujerd-Nezam zone consists of hornfels, schist, phyllite, migmatite, granite and granodiorite rock types. Metamorphic (hornfels and schist) and igneous (granitoids) rocks are known as host pegmatitic dykes. Quartz, feldspar, muscovite and tourmaline are the most common pegmatite, and mica are as muscovite ...
متن کاملTransmission electron microscopy of muscovite alteration of tourmaline
Partially sericitized tourmaline from a pegmatite was investigated using high-resolution transmission electron microscopy (HRTEM). Fine-grained muscovite crystals form extensive narrow veinlets preferentially developed along the {110} and {100} cleavages of tourmaline, indicating that a cleavage-controlled alteration mechanism was dominant. HRTEM images show that tourmaline-muscovite interfaces...
متن کاملLithium and its isotopes in tourmaline as indicators of the crystallization process in the San Diego County pegmatites, California, USA
In the lithium-cesium-tantalum-type pegmatite dikes of San Diego County, California, USA, tourmaline is the main reservoir for Li, except in the cores and the pockets of the dikes where other Li-bearing minerals also occur. Tourmaline from three subhorizontal dikes was analyzed for bulk Li concentrations and Li isotope ratios. The bottom portion of each dike includes rhythmically layered aplite...
متن کاملترکیب تورمالین در پگماتیت‌های چاه رویی، جنوب غربی نهبندان
The Chah ruii area in southwest of Nehbandan contains two types of tourmaline pegmatites. Type one (type CH) pegmatites are found in the granitoid body and type two (type D) pegmatites in metamorphic rocks around the granitoid. Based on petrography and electron microprobe analyses these tourmalines show schorl- dravite, and located in alkali groups and have high Al contents and deprotonation-su...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Nepal Geological Society
سال: 1995
ISSN: 2676-1378,0259-1316
DOI: 10.3126/jngs.v11i0.32789