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滇西点仓山构造带新生代岩浆活动及其构造意义 - igeodata@CAGS.PDF

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1000 - 0569 /2014 /030 (08)- 2217 - 28 Acta Petrologica Sinica 岩石学报 * 滇西点仓山构造带新生代岩浆活动及其构造意义 戚学祥1 赵宇浩1 朱路华2 胡兆初3 张超1 吉风宝1 QI XueXiang1 ,ZHAO YuHao1 ,ZHU LuHua2 ,HU ZhaoChu3 ,ZHANG Chao1 and JI FengBao1 1. , 100037 大陆构造与动力学国家重点实验室 中国地质科学院院地质研究所北京 2. , 510080 广东省有色地质勘察局地质勘察研究院 广州 3. , 430074 中国地质大学地质过程与矿产资源国家重点实验室 武汉 1. State Key Laboratory of Continental Tectonics and Dynamics ;Institute of Geology ,Chinese Academy of Geological Sciences,Beijing 100037,China 2. Geological Survey Institute of Guangzhou Bureau of Nonferrous Geology ,Guangzhou 510080 ,China 3. State Key Laboratory of Geological Processes and Mineral Resources ,Chinese University of Geosciences,Wuhan 430074 ,China 2014 - 03 - 20 收稿,2014 - 05 - 14 改回. Qi XX ,Zhao YH ,Zhu LH ,Hu ZC ,Zhang C and Ji FB. 2014. Cenozoic magmatism in Diancanshan Range ,southwestern :2217 - 2228 Yunnan ,China ,and its tectonic implications. Acta Petrologica Sinica ,30 (8) Abstract The Diancangshan (DCS)Range is an important part of the Ailoashan - Jinshajiang strike - slip shearing zone. New LA - ICP - MS zircon U - Pb analyses showed that the granites in the DCS intruded at a time span of 27. 9 ± 0. 7Ma to 34. 8 ± 0. 4Ma. Those granites are characterized by : 1()the mineral assemblages containing biotite and muscovite ; 2()high SiO2 (> 70. 95% ), O + K O (7. 16% ~ 8. 44% ) O (> 13. 48% )and A /CNK ratios (most of them > 1. 1 ) O /K O ratios (< 1. Na2 2 ,Al2 3 ,and low Na2 2 0 ) ;3()enrichment i
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