Gravel Fabric Characteristics of the Neocene Mahui Formation in Yushe Basin, Shanxi and Its Geological Significance

Abstract

Abstract:

Based on the analysis of gravel fabric characteristics of conglomerate layers of the Middle Neogene Mahui Formation in Yushe basin, combined with the lithological study of basin basement and its adjacent mountains, this paper deals with the origins, sources, hydrodynamic conditions, climate environment, geomorphy and tectonics of Yushe basin, Shanxi. The study reveals that Mahui Formation is composed of fluvial and lacustrine basal conglomerate during Neocene, of which three conglomerate layers show better consistency in origins, sources, transport and sedimentary environment. The conglomerate layers of Mahui Formation are multiperiods, multisources and unsteady alluvial and lacustrine sediment, which indicates an environment from drycold to humid. The gravels underwent strongly physical and chemical weathering and some biological action. The main source rocks of the conglomerate are basement strata of the basin and strata located in the eastern, northern and western margin of the basin. Lower content granite gravels were carried over comparatively long distance. Nevertheless, the majority of gravels underwent nearmedium distance transport. A conclusion is drawn that Yushe basin is an intramontane basin formed by relative mountain uplift in the east of Shanxi during the second stage of the Himalayan movement.

Key words: Mahui Formation, conglomerate layer, gravel fabric, Yushe basin, Neogene

CLC Number:

P53462

JIAN Cheng, HAN Jian-En, TU Jia, HE Cheng-An, SHU Da-Gang, MENG Xian-Gang, SHAO Zhao-Gang, WANG Jin. Gravel Fabric Characteristics of the Neocene Mahui Formation in Yushe Basin, Shanxi and Its Geological Significance[J]. Geoscience, 2011, 25(4): 778-788.

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