کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8907648 1635126 2018 41 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Morphology and composition of zircons in rare metal granites from Brazilian tin provinces
ترجمه فارسی عنوان
مورفولوژی و ترکیب زیرکون ها در گرانیت های فلز نادر از استان های برزیل قلع
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
چکیده انگلیسی
Zircons of rare metal specialized granites from five large Brazilian tin provinces were compared morphologically and chemically through backscattered electron images and X-ray dispersive spectroscopy (SEM-EDS) in terms of Hf, Zr/Hf and Hf + Y + Th + U contents. Zircon crystals from the mineralized, evolved hydrothermalized rocks are fine-grained, anhedral, corroded and show little or no obvious zoning. They exhibit high Hf and Hf + Y + Th + U contents and low Zr/Hf values (generally <15) compared to those from less evolved unmineralized granites. Electron microprobe and LA-ICP-MS analyses of zircons from tin-mineralized and barren granites identified similar geochemical trends to those obtained by semiquantitative SEM-EDS. The Geochemical signature of zircon can be used as a prospective guide for specialized granites and zircon SEM-EDS analyses are a reliable tool in preliminary prospecting for this type of mineralization.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of South American Earth Sciences - Volume 84, July 2018, Pages 1-15
نویسندگان
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