Citation: | Jing Yuqian, Lei Chuang, Liu Kedong, Li Zhenhua. Deposition environment and provenance of the Palaeogene Shahejie Formation in Nanpu Sag: Evidences from trace and rare earth element geochemistry[J]. Bulletin of Geological Science and Technology, 2023, 42(1): 350-359. doi: 10.19509/j.cnki.dzkq.2022.0131 |
In order to reveal the formation mechanism of the organic-rich shales of the Shahejie Formation in Nanpu Sag, the depositional environment and provenance were investigated in detail through analyzing trace and rare earth elements(REE) geochemical characteristics. The results show that the trace elements Li, Cs and Bi are enriched, Cr and Sn are relatively depleted, and other trace elements are close to those in the upper continental crust(UCC).The total amount of REE vary widely, which is close to or higher than the average value in the UCC, and the supply of terrestrial source debris is adequate. The REE allocation pattern shows light rare earth element(LREE) enrichment with a high degree of divergence, and a relative deficit of heavy rare earth element(HREE) with a low degree of divergence. Eu negative anomaly is obvious, Ce is basically normal. The variations of Sr abundance and Sr/Ba ratio reflect that, in Nanpu Sag, the lake water was separated to a certain extent, and the fresh water, brackish water and saline water coexisted during sedimentary period of the third member of Shahejie Formation(E
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