کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4730877 1356784 2014 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cenozoic high-K alkaline magmatism and associated Cu–Mo–Au mineralization in the Jinping–Fan Si Pan region, southeastern Ailao Shan–Red River shear zone, southwestern China–northwestern Vietnam
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
Cenozoic high-K alkaline magmatism and associated Cu–Mo–Au mineralization in the Jinping–Fan Si Pan region, southeastern Ailao Shan–Red River shear zone, southwestern China–northwestern Vietnam
چکیده انگلیسی


• Epithermal-porphyry Cu–Au mineralization is related to the 40–32 Ma high-K alkaline magmatism.
• The porphyry Cu–Mo–Au and epithermal Au systems have magmatic S and Pb isotopes.
• Paleotethyan subduction and Indian–Eurasian Plate interaction contributed to mineralization.

The Jinping–Fan Si Pan (JFP) Cenozoic magmatic and Cu–Mo–Au metallogenic belt in the southeastern part of the Ailao Shan shear zone host the Tongchang, Chang′an, Habo, and Chinh Sang Cu–Mo–Au deposits. These deposits form an integrated epithermal-porphyry regional mineralization system associated with 40–32 Ma high-K alkaline magmatism. The magmatic rocks in the belt have relatively low TiO2 (<0.73 wt%), P2O5 (<0.29 wt%), and FeO* (<4.99 wt%), and high Na2O (2.86–4.75 wt%) and K2O (4.01–7.98 wt%). They also have high contents of incompatible trace elements, and are enriched in LILE (Rb, Ba, K, Sr) and LREE. They have marked Nb, Ta, Ti and P depletion in primitive mantle-normalized spidergrams, and plot close to the EMII mantle field in the Sr–Nd isotopic diagram. These characteristics are similar to those of the Eocene high-K alkaline rocks along the northern Ailao Shan belt, eastern Tibet plateau. The sulfur and lead isotope analyses of sulfide minerals from both the ores and related magmatic rocks confirm the involvement of a magmatic ore fluid. The Cenozoic alkaline intrusions and Cu–Mo–Au mineralization in the JFP were formed prior to the initiation of left-lateral shearing along the Ailao Shan shear zone. The magmas appear to have been derived from enriched mantle, possibly with mixing of materials from the buried Tethyan oceanic lithosphere, and/or crust.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Asian Earth Sciences - Volume 79, Part B, 5 January 2014, Pages 858–872
نویسندگان
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