نتایج جستجو برای: metasomatism
تعداد نتایج: 517 فیلتر نتایج به سال:
Abstract The slab–mantle interface in subduction zones is one of the geological boundaries with most significant chemical potential gradients, which leads to fluid-mediated metasomatic reactions and transport. As subducting sediment basaltic crust often contain silica various forms, Si-metasomatism mantle rocks thought occur along zone interface. However, growing evidence from geochemistry alte...
Siah-Kamar hornfalses and skarns are located about 5Km east of Dehsalm and 85Km west of Nehbandan city, southeast of Birjand Province and east of Lut Block. This Skarn formed by injected Rigi granitoid (Eocene age) into limestone and sandstone (Upper Cratacious). Rigi Mountain is mainly granodiorite in composition and contains plagioclase, quartz, hornbelend and biotite minerals. Geochemistry ...
چکیده ندارد.
The studied area is a small portion of Sanandaj – Sirjan zone. Metasomatism at the contact of intrusive body studied and penetration of Al-rich rocks caused tourmalinization to stratiform tourmalinite in pelitic hornfels. In addition, hydrothermal fluids crystallized tourmaline nodules in monzogranite surface. The Fe/ (Fe + Mg) ratio in varied between 0.4-0.76 in stratiform tourmaline and 0.83-...
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