Zircon U-Pb Geochronological Evidence for the Evolution of the Nan-Uttaradit Suture in Northern Thailand  

作　　者：Wenqiang Yang Xin Qian Qinglai Feng Shangyue Shen Chongpan Chonglakmani 

机构地区：[1]Wuhan Center of Geological Survey,Wuhan 430205,China [2]State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China [3]School of Earth Sciences,China University of Geosciences,Wuhan 430074,China [4]School of Geotechnology,Suranaree University of Technology,Nakhon Ratchasima 30000,Thailand

出　　处：《Journal of Earth Science》2016年第3期378-390,共13页地球科学学刊（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.41172202,41190073,41302178);the China Geological Survey(No.1212011121256);the State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences in Wuhan(No.MSFGPMR201402)

摘　　要：The Nan-Uttaradit suture is marked by a narrow N-S trending and discontinuous ophiolite belt in northern Thailand. This suture zone is a mélange composed of gabbro, tholeiitic meta- basalt, andesite and radiolarian chert. Samples of gabbro and meta-basalt in the Nan-Uttaradit suture yield zircon U-Pb ages of 311±10 and 316±3 Ma, respectively, interpreted as the crystallization ages of the rocks, suggesting the Nan-Uttaradit Ocean existed in the Late Carboniferous. Our results indicate that the Nan-Uttaradit Ocean co-existed with the Ailaoshan-Jinshajiang Ocean to the north and was probably an along-strike extension of the latter.The Nan-Uttaradit suture is marked by a narrow N-S trending and discontinuous ophiolite belt in northern Thailand. This suture zone is a mélange composed of gabbro, tholeiitic meta- basalt, andesite and radiolarian chert. Samples of gabbro and meta-basalt in the Nan-Uttaradit suture yield zircon U-Pb ages of 311±10 and 316±3 Ma, respectively, interpreted as the crystallization ages of the rocks, suggesting the Nan-Uttaradit Ocean existed in the Late Carboniferous. Our results indicate that the Nan-Uttaradit Ocean co-existed with the Ailaoshan-Jinshajiang Ocean to the north and was probably an along-strike extension of the latter.

关 键 词：Nan-Uttaradit suture ophiolite mélange zircon U-Pb age northern Thailand 

分 类 号：P597.3[天文地球—地球化学] P548[天文地球—地质学]