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Geochronology of the volcanic rocks in the Lu-Zong basin and its significance

Science China Earth Sciences 2008年第10期51卷 1470-1482页

作者： David COOKE Sebastien MEFFRE Centre of Excellence in Ore Deposits (CODES) University of Tasmania

The Lu-Zong (Lujiang-Zongyang) basin is one of the most important volcanic basins in the middle and lower reaches of the Yangtze River area, China. It comprises four shoshonitic volcanic units, which are, in an ascending order, the Longmenyuan, Zhuanqiao, Shuangmiao and Fushan Groups. The LA-ICP MS U-Pb zircon ages of the four units are: 134.8±1.8 Ma for the Longmenyuan Group, 134.1±1.6 Ma for the Zhuanqiao Group, 130.5±0.8 Ma for the Shuangmiao Group, and 127.1±1.2 Ma for the Fushan Group. The results indicate that all volcanic rocks in the Lu-Zong basin were formed in the Early Cretaceous from about 135 Ma to 127 Ma, lasting 8-10 Ma. There were no Jurassic volcanic activities in all the volcanic basins including the Lu-Zong basin in the middle and lower reaches of the Yangtze River area. This work has provided new chronological results for the further study and understanding of the tec- tonic, magmatic and metallogenic processes of eastern China in the Mesozoic.

关键词： zircon LA-ICP MS dating volcanic rocks geochronologic age Lu-Zong basin

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DISPLACEMENT HISTORY OF THE GANGDESE THRUST, ZEDONG WINDOW, SOUTHEASTERN TIBET

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地学前缘 2000年第S1期7卷 109-109页

作者： T. Mark Harrison 1,Yin An 1, Marty Grove 1, Oscar M. Lovera 1,F.J. Ryerson 2,Zhou Xinhua 3[WT5,5”BX](1 Department of Earth and Space Sciences & IGPP, UCLA, Los Angeles, CA, 90095\|1567, USA. 2 Institute of Geophysics & Planetary Physics

Determining the timing, magnitude, and location of deformation due to the Indo\|Asian collision is widely acknowledged as an important step in understanding how the lithosphere responds during continental collision. Thus a puzzling result of geological investigations of the Lhasa Block over the past two decades has been the apparent lack of significant Tertiary deformation there. Perhaps the most important structural feature of the Lhasa Block is the south\|directed Gangdese Thrust System, which developed along its southern edge. The thrust system, which separates the Andean\|type batholith of southern Asia from rocks of Indian affinity, is obscured at most locations across southeastern Tibet by backthrusts of the younger, north\|directed Renbu Zedong Thrust System. The best documented site where both thrusts are exposed is a structural window near Zedong.

关键词： displacement geochronologic analyses the Gangdese Thrust the Z edong Window Southeastern Tibet

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