Paleogeography of the Northern Margin of Indian Continent Prior to Its Collision: An Investigation of the Late Cretaceous Limestones in South Tibet
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    Abstract:

    The available paleomagnetic data from Duila limestones provide important constraints on paleogeography of the northern margin of Greater India but controversy still remains. Hence we carried out a further study on the late Cretaceous marine sediments in this area. On the basis of systematic demagnetization and statistical analysis on samples collected from 10 sites, characteristic remnant magnetizations (ChRMs) were successfully isolated with tilt-corrected direction of D=168.2°,I=-7.3°,α95=7.5°, which is insignificantly different from the one obtained from the middle and upper part of the Zongshan Formation in the area of Duila and have passed a positive fold test suggesting a pre-folding in nature. The uniform reversed polarity of the ChRMs for the Zongshan and Gamba CunKou formations is, however, incompatible with the geomagnetic polarity time scale during the time interval from the Turonian to Maastrichtian suggesting that the primary remanence of the rocks had most probably been completely overprinted and hence could not be used for paleogeographic reconstruction of Greater India. Excluding the data obtained from the Zongshan Formation in the Duila area, the remaining 8 sites obtained from the area of Gamba suggest that the Tethyan Himalayan Terrane was located at ~9°S, and the amount of the northern extension of Greater India is recalculated to be ~1500 km, which is compatible with the one obtained from the Zongpu Formation by former studies.

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YI Zhiyu, LIANG Yalun, ZHAO Jie, YAN Yonggang, CHEN Liwei, TAN Xiangde.2016. Paleogeography of the Northern Margin of Indian Continent Prior to Its Collision: An Investigation of the Late Cretaceous Limestones in South Tibet[J]. Acta Geologica Sinica,90(11):3282-3292

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  • Received:
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  • Online: November 01,2016
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