The Genesis and Period of Authigenic Diagenetic Mineral in Triassic Yanchang Formation,the Southern Ordos Basin

doi:10.11885/j.issn.1674-5086.2018.05.18.02

Abstract

Abstract: In order to understand the time and process of diagenetic mineral formation in the Triassic Yanchang Formation in the southern Ordos Basin, the occurrence of authigenic minerals and their alternative relationship with other types of minerals are examined. Furthermore, the liquid information of diagenetic minerals is recorded using fluid inclusion and the oxygen isotope data of carbonates. Based on these findings, the genesis and period of authigenic diagenetic minerals in the southern part of the Ordos Basin is discussed in detail. The study shows that mud-microcrystalline calcite, siderite, and dolomite (Xunyi Area) are diagenetic minerals precipitated at the early stages. Among these minerals, siderite is formed earlier than the authigenic chlorite coating, while the mud-microcrystalline calcite is formed at approximately the same time with siderite. The dolomite cement found in the Xunyi Area is formed at the same time with the mud-microcrystalline calcite and siderite found in the north source areas. The mid-late stage sparry calcite and ferroan calcite are both formed earlier than the dolomite and ferroan dolomite. The two generations associated with quartz secondary enlargement corresponds to 90.0~100.0℃ and 110.0~120.0℃, respectively. The growth period of authigenic microcrystalline quartz is slightly earlier than or the same as the formation time of authigenic chlorite. The authigenic chlorite coating is formed during early diagenesis, which often grows in two generations. The authigenic chlorite in the first generation is formed at 20.0~50.0℃ and mainly exists in the form of ring-edge occurrence of chlorite particles. The second generation authigenic chlorite, formed by compaction, is found to only grow on the particle surface in contact with the pore, or the surface of microcrystalline quartz crystals formed from the first-generation chlorite. The formation temperature of the second generation authigenic chlorite is around 50.0~70.0℃. The authigenic illite is found to be widely distributed in the Yanchang Formation in the research region. The authigenic illite is formed from multiple sources.

Key words: southern Ordos Basin, Triassic period, Yanchang Formation, authigenic mineral, genesis, period

CLC Number:

TE122

YANG Chao, HE Yonghong, LEI Yuhong, PANG Fei, LI Xiaolu. The Genesis and Period of Authigenic Diagenetic Mineral in Triassic Yanchang Formation,the Southern Ordos Basin[J]. 西南石油大学学报(自然科学版), 2019, 41(4): 45-54.

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