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Introduction to the geology and mineralogy of pegmatites located south of Mashhad (first report of Li-bearing pegmatites from Iran) | ||
Quarterly Journal of Tethys | ||
شناسنامه علمی شماره، دوره 3، شماره 2، شهریور 2015، صفحه 123-136 اصل مقاله (2.47 M) | ||
چکیده | ||
The granites south of Mashhad are located in the north-east of Iran and occur in the suture zone between the Binalud and Kopeh Dagh areas. These S-type granites are peraluminous with an Upper Triassic Age and include intersecting pegmatites. These pegmatites are homogenous and show simple mineralogical combinations which include K-feldspars (microcline and orthoclase), plagioclase, quartz, micas (biotite, muscovite and lepidolite), tourmaline (elbaite, dravite, and schorl) and garnet (almandine-spessartite). The pegmatites south of Mashhad belong to the LCT (Lithium-Cesium-Tantalum) and MSREL-Li (Muscovite- REE-Li).The Li-content of these pegmatites ranges between 202-1653 ppm and the ratios K/Cs, K/Rb and Al/Ga are high which indicates a low level of differentiation. The Mg/ Li ratio in these pegmatites lies between 0.2-12.6. All the element ratios indicate that pegmatites are low evolved. | ||
کلیدواژهها | ||
Pegmatite؛ Lepidolite؛ Lithium؛ Mashhad؛ Iran | ||
آمار تعداد مشاهده مقاله: 1,036 تعداد دریافت فایل اصل مقاله: 566 |