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Evidence for Tibetan Plateau Uplift in Qaidam Basin before Eocene–Oligocene Boundary and Its Climatic Implications

Journal of China University of Geosciences 2009年第2期20卷 430-437页

作者：裴军令孙知明王喜生赵越葛肖虹郭新转李海兵司家亮 Key Laboratory of Paleomagnetism Institute of GeomechanicsChinese Academy of Geological Sciences College of Earth Sciences Jilin University Key Laboratory for Continental Dynamics of the Ministry of Land and Resources Institute of GeologyChinese Academy of Geological Sciences

Geometry analysis of the Hongsanhan （红三旱） Section in the northwestern Qaidam basin illustrates the typical growth strata in the Xiaganchaigou （下干柴沟） Formation. The age and sedimentation rates of the Xiaganchaigou and the Shangganchaigou （上干柴沟） formations were determined by the high-resolution magnetostratigraphy. This result shows that the growth strata began to form at ca. 38.0 Ma and increased sedimentation rates occurred at ca. 37.0 Ma. The uplift of the Tibetan plateau before the Eocene-Oligocene boundary is confirmed, which enables us to better understand the relationship between climatic changes and the tectonic uplift. This uplift event could have resuited in the regional drying by blocking the moisture and contributed to the Eocene-Oligocene boundary global cooling event due to the declining atmospheric CO2 concentrations by increased weathering of the mountains.

关键词： Qaidam basin Eocene-Oligocene boundary growth stratum magnetostratigraphy.

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magnetostratigraphy.of the late Cenozoic Laojunmiao anticline in the northern Qilian Mountains and its implications for the northern Tibetan Plateau uplift

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Science China Earth Sciences 2005年第7期 1040-1051页

作者： FANG Xiaomin1,2, ZHAO Zhijun3,2, LI Jijun2, YAN Maodu2, PAN Baotian2, SONG Chunhui2 & DAI Shuang2 1. Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China 2. Key Laboratory of Western China's Environmental Systems, Ministry of Education & College of Resources and Environment, Lanzhou University, Lanzhou 730000, China 3. College of Geography, Nanjing Normal University, Nanjing 210097, China

Cenozoic sediments in the foreland basin——Jiuquan Basin in west Hexi Corridor recorded tectonic uplift information of the Qilian Mountains. High resolution paleomagnetic dating of the Laojunmiao （LJM） section across the central LJM anticline in the southern Jiuquan Basin reveals ages of the Getanggou Member, Niugetao Member in the Shulehe Formation, the Yumen Conglomerate, Jiuquan Conglomerate and Gobi Formation at >13―8.3 Ma, 8.3―4.9 Ma, 3.66― 0.93 Ma, 0.84―0.14 Ma and 0.14―0 Ma, respectively. Sedimentary evolution study suggests that the Qilian Mountains should begin to rise gradually since8―6.6 Ma, accompanied by sedimentary environments changing from lacustrine mudstones-sandstones to alluvial conglom- erates. Rapid uplift of the Qilian Mountains began at3.66 Ma, followed by a series of stepwise or intermittent intensive uplifts at about <1.8―1.23 Ma, 0.93―0.84 Ma and 0.14 Ma, which finally resulted in the present high Qilian Mountains.

关键词： Qilian Mountains Qinghai-Tibetan Plateau Jiuquan Basin magnetostratigraphy.

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PALAEOMAGNETIC STUDY OF SONGLIAO BLOCK IN LATE MESOZOIC ERA

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Chinese Science Bulletin 1989年第3期34卷 220-222页

作者：方大钧高瑞琪王兆梁程学儒张兆华谢锦龙 Department of Geology Zhejiang University Hangzhou Exploring and Developing Institute of Daqing Oil Field

Songliao is one of the large continental oil basins of Eastern China covering an area of 260,000 km^2. It is a new type of introcratonic complex basin. The Upper Jurassic Series and whole Cretaceous have well developed upon the pre-Mesozoic folded base. The Upper Jurassic and Cretaceous Taonan Fro., Shahezi Fro. and Yingcheng Fro. are composed of volcanic rocks, volcanic clastic rocks and

关键词： Sonsliao Cretaceous magnetostratigraphy.

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