LA-ICP-MS zircon U-Pb geochronology of the Taihua complex in Lushan area of Henan Province and its geological implications
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    Abstract:

    As the largest and oldest craton in China, the North China Craton is an ideal region for investigating the magmatic activity and tectonic evolution of Archean period, and hence has attracted considerable interest among geologists in China. The Taihua complex is an important part of the North China Craton, distributed in WWN-EES direction along its southern margin. In this study, the authors chose the Taihua complex in the Lushan area as the study object, investigated geological section in detail, and revealed formation age, metamorphic events age by LA-ICP-MS zircon U-Pb dating. Zircon U-Pb dating of the amphiboite yielded the weighted mean 207Pb/206Pb ages of 2 788±16 Ma, 2 714±12 Ma, and 1 920±18 Ma, which represent the formation age of the amphiboite, first stage metamorphic age, and second stage metamorphic age, respectively. Together with previous work about zircon U-Pb dating and Hf isotope, the authors analyzed and discussed the geological significance of the three geological events:2 850~2 700 Ma is an important period of magmatic event, and represents the formation of Archean new crust; 2 800~2 600 Ma and~1 900 represent the two metamorphic events and suggest that the Taihua complex was subjected to Neoarchean and Paleoproterozoic metamorphic alteration. The results obtained by the authors not only contribute to the interpretation of the formation age and the age of the metamorphic events of the Taihua complex and their geological significance but also provide new data for the further study of the formation and evolution of the southern margin of North China Craton and the whole North China Craton.

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董猛猛,王长明,姚恩亚,贺昕宇,夏锦胜,王乔,陈晶源,王长侬,杨立飞,杜斌,石康兴,2018,河南鲁山地区太华杂岩LA-ICP-MS锆石U-Pb年代学及其地质意义[J].岩石矿物学杂志,37(1):1~18. DONG Meng-meng, WANG Chang-ming, YAO En-ya, HE Xin-yu, XIA Jin-sheng, WANG Qiao, CHEN Jing-yuan, WANG Chang-nong, YANG Li-fei, DU Bin, SHI Kang-xing,2018,LA-ICP-MS zircon U-Pb geochronology of the Taihua complex in Lushan area of Henan Province and its geological implications[J]. Acta Petrologica et Mineralogica,37(1):1~18.

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History
  • Received:February 18,2017
  • Revised:July 17,2017
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  • Online: January 13,2018
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