Discussion on Genesis of Red Beds of Jurassic in Yongjin Area in Junggar Basin

Abstract

Abstract: The red sandy mudstone deposit (red beds) occurs in the top of Jurassic in Yongjin area of Junggar basin. Based on the core observation, change of clay mineral composition, oxide ratio and chemical alteration index analysis, the red beds are normal sedimentary rocks formed in the shore-shallow lake or braided delta front environment, followed by being oxidized while migration and deposition under the semiarid-subhumid climate. The result shows that the red beds are in weak chemical weathering and leaching process without weathering crust. It is suggested that the red beds should belong to Toutunhe formation of Middle Jurassic. The Che-Mo palaeohigh developed in late of Middle Jurassic is of short-term subsidence and then uplift features.

Key words: Junggar basin, Yongjin area, Jurassic, red bed, genesis

CLC Number:

TE111.3

HE Zhen-jian. Discussion on Genesis of Red Beds of Jurassic in Yongjin Area in Junggar Basin[J]. Xinjiang Petroleum Geology, 2009, 30(1): 133-135.

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