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Zircon SHRIMP U-Pb dating for the Cangshuipu volcanic rocks and its implications for the lower boundary age of the Nanhua strata in South china

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Science Bulletin 2003年第16期48卷 1663-1669页

作者： WANG Jian1, LI Xianhua2, DUAN Taizhong3. LIU Dunyi4, SONG Biao4, LI Zhongxiong1 & GAO Yonghua5 1. Chengdu Institute of Geology and Mineral Resources, china Geologi-cal survey, Chengdu 610082, china 2. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, china 3. Colorado School of Mines, Golden, CO 80401-1887, USA (Present address: Marathon Oil Company, Houston, TX 77056-2725, USA) 4. Institute of Geology, Chinese Academy of geological Sciences, Bei-jing 10003., china 5. Graduate School of the Chinese Academy of geological Sciences, Beijing 10003., china Correspondence should be addressed to Wang Jian (e-mail: jianwang@ ***) Chengdu Institute of Geology and Mineral Resources China Geological Survey Chengdu China Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China Colorado School of Mines Golden USA Institute of Geology Chinese Academy of Geological Sciences Beijing China Graduate School of the Chinese Academy of geological Sciences Beijing China

the continental volcanic rocks and volcaniclas-tic sedimentary conglomerates of the Cangshuipu Formation occur well in Yiyang of Hunan province, consisting of a wedge-shaped succession of Neoproterozoic strata that over-lie with high-angle unconformity the flysch turbidites of the Lengjiaxi Group in the Upper Mesoproterozoic Eonothem. SHRIMP zircon U-Pb dating gives a weighted mean age of 814 12 Ma for the dacitic volcanic agglomerates from the lowest part of the volcanic rocks in the Cangshuipu Forma-tion. this age is younger than previously reported values of 921—93. Ma for the volcanic rocks from the Cangshuipu Formation. Our new dating represents the lower boundary age of the Neoproterozoic System in the studied area. the younger age for the Cangshuipu volcanic rocks is supported by the following observations: （1） Lower Neoproterozoic strata （814—1000 Ma） are missing in the studied area; （2） the Nanhua rift system was initiated at about 820 Ma; and （3. an age of820 Ma may be taken as the lower boundary tim-ing of the Nanhua System （even Neoproterozoic） in South china.

关键词： Zicon U-Pb dating Neoproterozoic volcanics rift basin Nanhua System.

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geological INTERPRETATION OF NANTIANMEN thRUST FAULT FROM TM IMAGE AND ITS SIGNIFICANCE

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Scientia Geologica Sinica 1997年第2期 45-52页

作者： Liu Junjie and Li Yonghua(liaoning Technical University, Fuxin 123.00)Ying Chengping(the 5th Prospecting Team of the Coal geological Bureau Northeast, Jinzhou))

ＧＥＯＬＯＧＩＣＡＬＩＮＴＥＲＰＲＥＴＡＴＩＯＮＯＦＮＡＮＴＩＡＮＭＥＮＴＨＲＵＴＦＡＵＬＴＦＲＯＭＴＭＩＭＡＧＥＡＮＤＩＴＳＳＩＧＮＩＦＩＣＡＮＣＥTXＧＥＯＬＯＧＩＣＡＬＩＮＴＥＲＰＲＥＴＡＴＩＯＮＯＦＮＡＮＴＩＡ... 详细信息

ＧＥＯＬＯＧＩＣＡＬＩＮＴＥＲＰＲＥＴＡＴＩＯＮＯＦＮＡＮＴＩＡＮＭＥＮＴＨＲＵＴＦＡＵＬＴＦＲＯＭＴＭＩＭＡＧＥＡＮＤＩＴＳＳＩＧＮＩＦＩＣＡＮＣＥTXＧＥＯＬＯＧＩＣＡＬＩＮＴＥＲＰＲＥＴＡＴＩＯＮＯＦＮＡＮＴＩＡＮＭＥＮＴＨＲＵＳＴＦＡＵＬＴＦＲ...

关键词： TM FROM IMAGE FAULT ITS AND

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Silurian Succession and Graptolite-Fauna of Lientan

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地质学报 1948年第Z2期 220-244+246-248页

作者： A.T.MU (geological survey of china)

Lientan is a town of Yu-nan;district of *** lies on the leftbank of Nankiang or South River which runs northward for 25 km toempty its water into Sikiang or West River at Nankiangkou;,about 150 kmwest of Canton.

关键词： Pt Silurian Succession and Graptolite-Fauna of Lientan

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Notes on Two New Ordovician Trilobites

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地质学报 1938年第2期 137-154+200-202页

作者： Y.WANG (geological survey of china)

While surveying the underground water resources in northwesternHonan in the winter of 193.,the writer accompanied by *** and ***,gave special attention to the collecting of fossils from the wide-spreadMiddle Ordovician Machiakou *** our collections thereis a single specimen of trilobite which is described in the present *** addition to the trilobite,there are cephalopods,crinoids and stroma-toporoids which still await identification.

关键词： view Notes on Two New Ordovician Trilobites

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Formation Mechanism and Exhumation Processes for HP-UHP Metamorphic Rocks in Dabie Mountains

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Journal of china University of Geosciences 2004年第2期15卷 193-205页

作者： Hou Mingjin Tectonique et Bassins Sédimentaires Laboratoire, Université de Paris-Sud 91405, ORSAY Cedex, France School of Resources and Environment, Hefei University of Technology, Hefei 23.009, china Anhui geological survey, Hefei 23.001, china Tang Jiafu Anhui geological survey, Hefei 23.001, china Tectonique et Bassins Sédimentaires Laboratoire Université de Paris-Sud 91405ORSAY CedexFrance School of Resources and Environment Hefei University of TechnologyHefei 230009China Anhui geological survey Hefei 230001China Anhui geological survey Hefei 230001China

the high, ultrahigh pressure metamorphic rocks, widely distributed in Dabie Mountains, were described in terms of the geological setting, the marks of the petrology and the mineralogy of the ultrahigh pressure (UHP) metamorphic rocks. According to the estimated uplifting and denudation of the Dabie Mountains, and to the thermodynamics theory, were assessed the depth and pressure (high pressure autoclave) of the formation setting of the UHP metamorphic rocks. Based on all the information mentioned above, a new explanation is derived from the mechanism of formation and the processes of exhumation of the UHP metamorphic rocks.

关键词： blueschist belt coesite-bearing eclogite belt abnormal crustal pressure,high pressure autoclave

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