Geochemical Characteristics of Mudstones in the Permo-Carboniferous Strata of the Jiaozuo Coalfield and Their Paleoenvironmental Significance
FU YaFei1, SHAO LongYi1, ZHANG Liang1, GUO ShuangQing2, SHI Biao3, HOU HaiHai1, YAN Han2, SONG JianJun3
1. School of Earth Sciences and Surveying Engineering, China University of Mining & Technology, Beijing 100083, China;
2. No. 3 Team of Henan Coal Geological Bureau, Zhengzhou 450046, China;
3. Henan Coal Geological Bureau, Zhengzhou 450016, China
Geochemical characteristics of mudstones contain a large amount of geological information, which are widely used in the analysis of provenance and sedimentary environments. The Permo-Carboniferous mudstones from the Jiaozuo Coalfield of Henan Province, northern China, were analyzed by means of X-ray fluorescence spectrometer and ICP-MS, and the major elements, trace elements, rare earth elements(REE) and minerals were determined. The provenance, source area weathering and paleoenvironmental characteristics are discussed. Argillaceous rocks were predominantly derived from post-Archean felsic igneous rocks based on the high values of Al2O3/TiO2, low values of Cr/Zr,K2O/Al2O3 and plots of Zr-TiO2,Th/Co-La/Sc,Ni-Cr and (Gd/Yb)N-Eu/Eu*. The values of CIA were underestimated because of potassium metasomatism of the argillaceous source area reflected by Al2O3-CaO*+Na2O-K2O diagrams and high clay mineral composition. Palaeo-weathering indices(CIW ratios) and Al2O3-CaO*-Na2O diagrams suggest that the source rocks were subjected to an extreme chemical weathering. Trace element composition characteristics (Sr/Ba, B/Ga) indicate that from the Benxi Formation to the early Taiyuan Formation, the sedimentary environment is marine facies, from the mid Taiyuan Formation to the early Shanxi Formation, the sedimentary environment is marine-continental transitional facies, from the mid Shanxi Formation to the Shangshihezi Formation, and the sedimentary environment is continental facies.
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Geochemical Characteristics of Mudstones in the Permo-Carboniferous Strata of the Jiaozuo Coalfield and Their Paleoenvironmental Significance[J]. Acta Sedimentologica Sinica, 2018, 36(2): 415-426.
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