Zircon U-Pb age of mafic-ultramafic rock from Pingchuan Region in Southern Sichuan and its geological implications

被引：4
作者：
Zeng, Ling-Gao [1 ,2 ,3 ]
Zhang, Jun [2 ]
Sun, Teng [2 ]
Guo, Dong-Bao [4 ]
机构：
[1] No. 9 Geological Brigade, Xinjiang Bureau of Geology and Mineral Resources
[2] Faculty of Earth Resources, China University of Geosciences
[3] State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences
[4] Faculty of Earth Sciences, China University of Geosciences
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2013年 / 38卷 / 06期
关键词：
Diagenesis-mineralization; Geochemistry; Mafic-ultramafic rock; Pingchuan region; Zircon;
D O I：
10.3799/dqkx.2013.118
中图分类号：
学科分类号：
摘要：
LA-ICP-MS zircon U-Pb dating and elements geochemical analysis has been carried out for mafic-ultramafic rock from Pingchuan to discuss the petrology characteristics and the time series of diagenesis-mineralization in Pingchuan region and further improve the geochronological framework of diagenesis-mineralization of the Panxi area. The test results show that Huangcaoping gabbro formed in 259.7±1.2 Ma and its capture zircon's crystallization age is 269.8±2.4 Ma, and the subvolcanic's reference diagenetic age is 248± Ma and its metamorphic zircon age is 67± Ma. The results indicate that mafic-ultramafic rock in Pingchuan region is a set of homologous phase sodium-rich tholeiitic rock series, conduciving to the formation of iron-mineralization, outputting in the continental rift environment, magma source coming from the upper mantle spinel lherzolite. The magmatic activity started no later than 269.8±2.4 Ma, and the large-scale magmatic activity occurred at 259.7±1.2 Ma, which constrained the mineralization time of magmatic profiled and volcanic eruptions (underflow) sedimentary, and the subvolcanic diagenetic age limited the upper mineralization time of sub-volcanic hydrothermal, and the metamorphic zircon U-Pb age recorded that Pingchuan region experienced Himalayan intracontinental orogeny. The tectonic-magmatic activity of Pingchuan region is featured with being explosive, phased and metallogenic; the formation of mafic-ultramafic rock in Pingchuan region is probably related to the large-scaled lithospheric thinning; diagenesis-mineralization in Hercynian-Indosinian in Panxi area is the comagmatic product of different phases evolution, controlled by regional uniform deep geodynamics.
引用
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页码：1197 / 1213
页数：16
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