Abstract：Helan Mountain-Liupan Mountain area is the key location to study the tectonic background in the west of North China Plate. We collected 20 samples of mud stone and silty mud stone and 1 coal sample in the study area. Then the testing on major,trace and rare earth elements were carried out by bulk rock analysis and ICP-MS,which could help understand the geochemistry characteristics of these samples. The results show: The ratio value of Al2O3/SiO2 stays steady from 0.17 to 0.31 with the average value 0.25; the ratio value of K2O/Na2O has a big fluctuation from 0.77 to 73.77 with the average value 9.78; the ratio of Al2O3/(Na2O+CaO)ranges from 0.49 to 96 with the average value 15.68. These ratio values are related to compositional maturity,element migration,hydrothermal fluid and weathering. Strong correlation among some elements is a natural advantage to determine provenance area. The total content of rare earth elements in the fine clastic sediments changes rapidly from 132.16×10μg·g-1 to 394.47μg·g-1 with the average value 198.68 μg·g-1. Meanwhile chondrite-normalized REE patterns reveal a deficit of light rare earth elements while the enriched heavy ones,negative Eu anomal and weak Ce anomaly. All of these characteristics together with UCC normalized REE patterns,ratios of La/Yb,Gd/Yb,La/Th and Hf indicate that the major source rock is felsic rock with slight elder sedimentary rock and basic rock or special minerals,meanwhile, the post￣Archeozoic strata provided most source rocks. The tectonic discrimination diagrams of trace element show the provenance of Middle Jurassic is close to the continental island arc and active continental margin,Mongol-Hinggan and Qilian orogenic belt maybe the provenance of the study area. The ratios of CIA and A-CN-K plots reflect the source rocks had experienced strong weathering with varying degrees in various regions.
Luo Wei,Liu Chiyang,Zhang Dongdong et al. Geochemistry characteristics of the Middle Jurassic Zhiluo Formation in Helan Mountain-Liupan Mountain area and their geological significances[J]. JOPC, 2016, 18(6): 1030-1043.
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