Geochronology of the Middle Triassic Andesites in Moheertu Area,Inner Mongolia,China,and Its Implications

摘要：

　　The Moheertu Middle Triassic andesitic rocks were first recognized in the middle east of the Xinganlling-Mongolia Orogenic Belt (XMOB) on the south of the Siberrian paleo-plate through our filed works.These rocks are composed of basaltic andesite and trachyandesite.Two representative samples were dated by LA-MC-ICP-MS.Zircon U-Pb dating results show that the crystallization ages of the andesites are between 234.8±3.2Ma (1σ, MSWD=0.84) and 231.4±-1.2 Ma (1σ, MSWD=2.5), which belong to the Middle Triassic.Combined these data with previously regional age data, we conclude that the andesites were formed in post-collisional extension tectonic setting within the XMOB, and they can be treated as new volcanic evidences formagrnatic evolution in the Middle Triassic.

关键词： Middle Triassic andesite U-Pb dating Xinganling-Mongolia Orogenic Belt Moheertu

作者: CHENG Yinhang TENG Xuejian YANG Junquan

作者单位: Tianjin Institute of Geology and Mineral Resources,Tianjin,P.R.China

会议类型: 国际会议

会议名称: 第十八届凯洛林国际地质学术研讨会(The 18th Kerulien International Conference on Geological)

会议地点: 石家庄

会议语种:英文

页码: 58-65

在线出版日期: 2013-09-20（万方平台首次上网日期，不代表论文的发表时间）