Zircon LA-ICP-MS U-Pb Dating and Geochemistry of Monzonitic Granite of Wujishan Iron Deposit in Yunnan Province
详细信息
- 责任者：Shen Zhanwu (Chengdu Institute of Geology and Mineral Resources ; Chengdu 610081 ; China) ; Jin Canhai
- 刊名：Journal of Mineralogy and Petrology
- 出版年：2013
- 卷期：33(1)
- 页码：p.53-59
- issnNo：ISSN1001-6872
- isbnNo：CN51-1143/TD
摘要
Monzonitic granite is related to the mineralization of Wujishan iron deposit in the Diantan of Tengchong County.Zircon LA-ICP-MS U-Pb dating shows that monzonitic granite has an average weighted age of 131.2 Ma±2.8 Ma,belonging to early cretaceous.w(SiO2) content ranges from 75.84% to 78.07%,w(K2O+Na2O) total content is 7.75%～8.64%,w(K2O/Na2O)>1,demonstrating that they are high K calc alkaline granites.In the ACF diagrams,data are plotted in the range of plagioclase-muscovite-cordierite,in accordance with range of S type or crust-derived type granite.A/NK value is 1.06～1.28(average 1.14) and A/CNK value is 0.92～0.97(average 0.94),belonging to category of quasi aluminum quality granite.In the trace element spider diagram,Rb,Ba,Ga,Nb,Ta,Th,U are of obvious positive anomaly,while Sr,V,Cr,Co,Ni,Sc are of obvious negative anomaly,and the distribution curve is characteristic of left "uplift" and right "sink",similar to S type or crust-derived type granite in the Nanling region.The smooth REE pattern,the poor fraction-ation between HREE and HREE,and strong depletion of EU(δEu = 0.04～0.05) indicate that Wujishan monzonitic granite belongs to crust-derived S type granite formed in the early Cretaceous.
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