کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9524419 | 1348971 | 2005 | 16 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
40Ar/39Ar geochronology of gold mineralization in Brasiliano strike-slip shear zones in the Borborema province, NE Brazil
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
40Ar/39Ar geochronology of muscovite and biotite grains genetically related to gold and Be-Ta-Li pegmatites from the Seridó Belt (Borborema province, NE Brazil) yield well-defined, reliable plateau ages. This information, combined with data about paragenetic and field relationships, reveals Cambro-Ordovician mineralization ages (520 and 500-506 Ma) for the orogenic gold deposits in the Seridó Belt. Biotite ages of 525±2 Ma, which represent the mean weighted results of the incremental heating analysis of six biotite single crystals, record the time of pegmatite emplacement and reactivation of Brasiliano/Pan-African strike-slip shear zones. These results, along with previous structural evolution studies, suggest that shear zones formed during the Brasiliano/Pan-African event were reactivated in the Upper Cambrian-Lower Ordovician. Mineralization occurs late in the history of the orogen.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of South American Earth Sciences - Volume 19, Issue 4, September 2005, Pages 445-460
Journal: Journal of South American Earth Sciences - Volume 19, Issue 4, September 2005, Pages 445-460
نویسندگان
Mário Neto C. Araújo, Paulo M. Vasconcelos, Fernando C. Alves da Silva, Emanuel F. Jardim de Sá, Jaziel M. Sá,