Study on the paleoclimate during the Datangpo interglacial stage of the Nanhua Period in the Zouma area, western Hubei Province
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    Abstract:

    The Gucheng Formation and the Nantuo Formation of Nanhua System(≈Cryogenian System) in Western Hubei belong to Sturtian and Marinoan glacial deposits respectively, and the Datangpo Formation represents interglacial deposits. In this paper, the evolution of paleoclimate in the Datangpo interglacial period was studied, and the zircon U- Pb age of the tuff in the lower part of the Datangpo Formation was used to restrict the time of paleoclimate warming, and to provide the basis for the establishment of the time framework of the glaciation. Methods: In this paper, the main and trace elements of the fine clastic rock samples from the Datangpo Formation of the ZK701 drillcore in the Zouma area were measured, and the paleoclimate proxy indexes, such as CIA, CIW, n(K)/n(Na), n(Mg)/n(Ca), Rb/Sr, were calculated. Zircon U- Pb age of tuff was determined by LA- ICP- MS. Results: The CIA values of the two samples in the upper part of the Gucheng Formation were 57. 1 and 58. 1, respectively. The CIA values of the lower part of the Datangpo Formation were 56. 5~64. 6, with an average of 59. 8, and the CIA values of the upper part were 69. 8~78. 8, with an average of 75. 5. The evolution process of CIW, n(K)/n(Na), n(Mg)/n(Ca), Rb/Sr was consistent with the CIA. The n(206Pb)/n(238U) weighted average age of zircon in DTPN1 tuff sample was 658. 1 ± 2. 6 Ma (MSWD = 1. 5, n= 28). Conclusions: The climate of the provenance area in the Yangtze Plate was cold and dry during the late Gucheng glacial period. The climate in the early Datangpo interglacial stage was still cold, and the climate of the middle and late Datangpo stage was warm and humid. The paleoclimate warming time of the Datangpo interglacial was about 658 Ma, and the early Datangpo period in the Yangtze Plate (663~658 Ma) may still belong to the end of Sturtian.

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LI Minglong, YANG Boyong, ZHENG Deshun, CHEN Lin, TIAN Jingchun.2021. Study on the paleoclimate during the Datangpo interglacial stage of the Nanhua Period in the Zouma area, western Hubei Province[J]. Geological Review,67(1):39-54.

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History
  • Received:April 04,2020
  • Revised:August 10,2020
  • Adopted:
  • Online: January 19,2021
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