کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4683001 | 1635182 | 2006 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Re-Os and U-Pb geochronology of the El Arco porphyry copper deposit, Baja California Mexico: Implications for the Jurassic tectonic setting
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم زمین و سیاره ای (عمومی)
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چکیده انگلیسی
New geochronologic data from the El Arco porphyry copper deposit, Baja California, Mexico, yield a Middle Jurassic crystallization U-Pb age of 164.7 ± 6.5 Ma for zircons from a granodiorite porphyry that hosts the Cu-Au-(Mo) mineralization, and four Re-Os molybdenite ages yield a weighted average age of 164.1 ± 0.4 Ma. These ages disagree with previous K-Ar age determinations that suggest a correlation of the intrusive rocks of El Arco-Calmalli area with the eastern Peninsular Ranges batholith of Cretaceous age. Instead, the volcanic-plutonic rocks of the El Arco-Calmalli area are more properly associated with the San Andres-Cedros volcanic-plutonic complex (â¼166 Ma). El Arco-Calmalli block likely was part of the intraoceanic arc system described in the Vizcaino-Cedros region and accreted to the continent during the Cretaceous (98-110 Ma). The presence of a continental Jurassic magmatic arc in the mainland and the occurrence of El Arco-Calmalli (San Andres-Cedros) volcanic-plutonic complex indicate two Jurassic magmatic arcs at this latitude (continental and oceanic).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of South American Earth Sciences - Volume 22, Issues 1â2, November 2006, Pages 39-51
Journal: Journal of South American Earth Sciences - Volume 22, Issues 1â2, November 2006, Pages 39-51
نویسندگان
V.A. Valencia, F. Barra, B. Weber, J. Ruiz, G. Gehrels, J. Chesley, M. Lopez-Martinez,