Journal of Geographical Sciences ›› 2017, Vol. 27 ›› Issue (11): 1359-1375.doi: 10.1007/s11442-017-1440-2

• Research Articles • Previous Articles     Next Articles

The episodic geomorphological-sedimentary evolution of different basins in the Fenwei Graben and its tectonic implication

Xiaomeng HU(), Tianhang ZHOU, Shun CAI   

  1. Geography Department, Shanghai Normal University, Shanghai 200234, China
  • Received:2017-06-05 Accepted:2017-07-06 Online:2017-11-10 Published:2017-09-07
  • About author:

    Author: Hu Xiaomeng, Professor, specialized in geomorphology and Quaternary research. E-mail: hxm@shnu.edu.cn

  • Supported by:
    National Natural Science Foundation of China, No.41371021

Abstract:

There are a series of basins in the Fenwei Graben. Field survey found that there took place several paleolake regressions or intensive stream down-incisions in all basins during the Mid-Late Quaternary. The lowest and oldest paleosol/loess units overlying three of the lacustrine terraces or alluvial ones and some paleomagenetism data from the lacustrine sediment indicate that the onset times of three paleolake regressions or intensive stream down-incisions are synchronous with the formation of L9, L6 and L2 respectively in the Weihe Basin, S8, S5 and S1 respectively in the Linfen-Taiyuan-Xingding Basins, and L8, L5 and L1 respectively in the Datong Basin. The difference in the onset time of each lake regressions or intensive stream down-incision in different basins reveals that the farther the basin is from the Tibetan Plateau, the later it took place. Taking these field facts and the former research results in terms of the regional tectonic movement into account, it is inferred that the tectonic movement of the Tibetan Plateau most probably controlled such geomorphological- sedimentary evolution in the graben.

Key words: Fenwei Graben, lacustrine and alluvial terrace, paleolake regression, Tibetan Plateau