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ESR Dating of the Evolution of the shuanghu Basin in the Northern Tibetan Plateau

Acta Geologica Sinica(English Edition) 1999年第3期73卷 289-293页

作者： WU Zhenhan JIANG Wan Peter Blisniuk BI Siwen ZHANG Shukun Olaf Kuchel MAO Yi Institute of Geomechcmics CAGS Minzu Xueyuan Nanlu Beijing 100081 Institut für Geowissenschaften Universitat Potsdam Postfach 601553 D-14415 Potsdam Germany

The shuanghu basin is a NE-trending rift basin bounded by NE-striking normal faults and NW-striking shear-extensional faults of the northern Tibetan Plateau. Four samples from calcite veins in marginal faults and one sample from mudstone (S-3) were collected for dating the evolution of the shuanghu basin by using the ESR spectrograph of EXM-type. Ages were calculated according to the close-equilibrium model on the basis of the measured ESR signal spectra of samples, providing good chronological information. It is known from the ESR dating that the extensional faulting and rifting of the shuanghu area began at 4.92 Ma B.P., followed by regional folding in 3.56–1.36 Ma, NW-striking faulting in 0.60 Ma and normal faulting in 0.024 Ma in the shuanghu basin.

关键词： ESR dating tectonic events shuanghu basin Tibetan Plateau.

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Studies on the Blueschist Belt in the shuanghu Region, Central Northern Tibet and Its Tectonic Implications

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Continental Dynamics 1999年第2期 51-64页

作者： BAO Peisheng XIAO Xuchang WANG Jun (Institute of Geology Chinese Academy of Geological Sciences )LI Cai HU Ke (Academy of Earth Sciences, Changchun University of Science and Technologr )

The blueschist blocks extend intermittently more than 300 km, from the eastern Qagelela town, 13 km west of shuanghu, Xiyaergang, central northern Tibet, through Naro, Jiaomuri, Gangtang Co, Guoganjianian Shan to western Gangmar Co-Lungmu Co. Most of the blueschist blocks are newly discovered by Li Cai et al. in recent years, which are associated with ophiolite melange and olistostromes, except those of Qagelela and Guoganjianian *** protoliths of the blueschist are mainly of the Late Carboniferous sedimentary-volcanic rock series,belong to the products of the margin of the Gondwana land, including basic volcanic rock, argillaceous sandstone,sandy-argillaceous limestone etc., and a few basic *** H.P/T minerals mainly consist of crossite, next magnesio-riebeckite and minor *** mineral assemblages are as follows: (1) Epidote + chlorite + crossite + albite; (2) Sericite + chlorite +magnesio-riebeckite (+winchite) + feldspar + quartz; (3) Calcite + crossite + epidote; (4) Chlorite + actinolite +winchite (±clinopyroxene).Estimated metamorphic pressure of the blueschist varies from 0.62～0.75 GPa and metamorphic temperature from 410～460℃, corresponding to the transitional facies between blueschist and *** 40Ar/39Ar isotope dating of crossite is 222.5±3.7 Ma, showing the metamorphic age ranging from the Late Paleozoic to Early *** high pressure metamorphic zone associated with ophiolitic melange being distributed along Lungmu Co-Gangmar Co-Guoganjianian Shan- shuanghu-Lancang River may be as a tectonic symbol of the subduction of an "initial limited oceanic basin" at the northern side of the Gondwana land, which is taken as a boundary between the Gondwana- and the Eurasian land.

关键词： blueschist tectonic implications shuanghu Northern Tibet

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Characteristics of the shuanghu graben and Cenozoic extension in northern Tibet

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Science China Earth Sciences 2001年第S1期44卷 284-291页

作者：李亚林王成善伊海生邓斌刘池阳杨兴科赖绍聪方维萱

The latest Qiangtang Terrane structure is characterized by the south-north-trending graben formed during the eastwestward extensional processes. The shuanghu graben is composed of a series of nearly parallel NE to NNE-trending normal faults. Studies on fault geometry, kinematics and sedimentation in the fault-controlled basin suggest that the faults activated periodically and their early activities began in the Pliocene, which caused the unconformable contact between the Pliocene and the subjacent shuanghu Formation, as well as between the Pliocene and the overlying Quaternary. The movement rates of the faults had been strikingly increased since Quaternary when the faults activated intensively. The graben resulted from the gravitational spreading after the uplift of the Tibetan Plateau. It is indicated that the collapse has been on setting in plateau hinterland.

关键词： : Qiangtang Terrane shuanghu graben extensional process.

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