Paleosalinity Restoration of Lower Triassic Baikouquan Formation in Mahu Sag, Junggar Basin

doi:10.7657/XJPG20170303

Abstract

Abstract: The Lower Triassic Baikouquan formation in the Mahu sag, Junggar basin is a set of sedimentary system of fan delta, which is dominated by coarse detrital deposits with a small amount of mudstones. In order to restore the paleosalinities of the water body during the deposition of the Baikouquan formation, and compared with those of the Upper Permian Wuerhe formation and Middle Triassic Kelamayi formation, whole rock tests of clay minerals and trace elements are carried out for the mudstone samples in the cores obtained from the above three formations. The methods such as Boron element, Sr/Ba ratio and B/Ga ratio are used to restore the water paleosalinities during the deposition of the Baikouquan formation. The results show that the clay minerals in the sample are dominated by illite/montmorillonite mixing layer, so Coach formula is suitable to be adopted to restore the paleosalinities. The average paleosalinities of the Upper Permian Wuerhe formation, T1b1, T1b2, T1b3 and Middle Triassic Kelamayi formation are 7.0‰, 5.0‰, 7.2‰, 8.9‰ and 8.4‰, respectively, indicating that the water at that time was fresh water-brackish water environment. The Baikouquan formation in Huangyangquan fan and Xiazijie fan exhibits different paleosalinity variation trend, relatively low paleosalinity of Huangyangquan fan and relatively high paleosalinity of Xiazijie fan may be related to the palaeosedimentary environment of the selected well locations. In addition, both Sr/Ba ratio and B/Ga ratio indicate a fresh water-brackish water environment in Mahu sag during Late Permian to Middle Triassic

CLC Number:

TE111.3

HUANG Yunfei1a, ZHANG Changmin1a, ZHU Rui1a, YI Xuefei1b, QU Jianhua2, TANG Yong2. Paleosalinity Restoration of Lower Triassic Baikouquan Formation in Mahu Sag, Junggar Basin[J]. , 2017, 38(3): 1-1.

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Paleosalinity Restoration of Lower Triassic Baikouquan Formation in Mahu Sag, Junggar Basin

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