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Magnetostratigraphy of the Zanda basin in southwest Tibet Plateau and its tectonic implications
作者: Wang, S.F., et al.
期刊名称: Chinese Science Bulletin
发表年度: 2008
卷: 53
期: 9
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页码: 1393-1400
摘要: The Zanda basin is one of the very important basins at the north slope of the Himalaya Range. Thus the study of the basin strata will provide critical information about the tectonic evolution of the Himalayan Orogenic Belt. 268 oriented block samples were collected in the 750-m-thick sections of the Zanda basin. The characteristic remanent magnetization (ChRM) was isolated that decays linearly to the origin between 500 degrees C and 690 degrees C for most studied samples. An age range of 9.5-2.6 Ma was estimated from the correlation between our observed polarity column and the Geomagnetic Polarity Time Scale (GPTS). The age of the Zanda basin does not support the models that the South Tibetan Detach system (STDS) is one of the basin controlling faults. Given the sedimentological features in the basin and the tectonic features at the north edge of the basin, the Zanda basin was a half graben that was possibly controlled by the Karakorum fault on the northeast.

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