ZHOU Xin-ping1,2, QI Hua-wen1*, HU Rui-zhong1, BI Xian-wu1, MENG Yu-miao1,2
1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract: In order to detect the features of ore-containing granites, the relationship between the Tungsten polymetallic ore mineralization and diagenesis, the regional tectonic significance of granite in the Tengchong region of west Yunnan, a systematical geochemical study on Guyong and Xinqi rock bodies in the Xinqi region of Tengchong was carried out. Results indicated that these two rock bodies have features of high-silicon, high potassium, rich alkaline, rich aluminum, and low titanium. The CaO/Na2O, Rb/Ba and Rb/Sr values of these rock beds reflected that their sources were clay-rich sandstone; the difference between trace and rare-earth elements contents indicated that the rock beds had different crystalline evolution processes. The diagenesis ages of the Guyong rock body and the Xinqi rock body by Zircon U-Pb dating are 62.9 ± 1.9 Ma and 61.9 ± 1.4 Ma, respectively, indicating that they invaded this area simultaneously or almost simultaneously. On the regional perspective, the diagenesis ages of the two rock bodies are similar to that of the Gangdese Lingzizong igneous rock (60 to 64.47 Ma), which represents the initial collision between the south-eastern edge of the Gangdese-Indian Plate and the Euro-Asian Plate.
Keywords: Xinqi area of Tengchong Granite geochemical characteristics U-Pb isotopes of zircon
*Corresponding Author, E-Mail: qihuawen@vip.gyig.ac.cn
Bulletin of Mineralogy, Petrology and Geochemistry Vol. 34, No.1, 2015, page 139-148
