| 吉泰盆地石炭系黄龙组黑色碳质泥岩物源、构造背景与古风化作用: 来自稳定元素地球化学的证据 |
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| 关键词:Jitai Basin geochemistry provenance tectonic evolution weathering |
| 基金项目:中央级公益性科研院所基本科研业务费专项(编号: KK2005; KK2016);国家973计划项目(编号: 2011CB403007);中国地质调查局地质矿产调查评价专项项目(编号: DD20190437; DD20190606) |
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| Provenance, Tectonic Setting and Palaeo-weathering of Black Carbonaceous Mudstones from Carboniferous Huanglong Formation in the Jitai Basin: Evidence from Stable Element Geochemistry |
| In the Cretaceous–Paleogene period, a huge amount of lithium-potassium rich brine was deposited in the Jitai Basin, which is rich in boron, rubidium, cesium, bromine, iodine and other emerging mineral resources, with high comprehensive utilization value. In this paper, the major, trace and rare earth element geochemical characteristics of Carboniferous Huanglong Formation black carbonaceous mudstone in the Jitai Basin were analyzed by X-ray fluorescence spectrometry (XRF) and inductively coupled plasma mass spectrometry (ICP-MS). Based on the detailed analysis of its provenance, tectonic setting and paleo-weathering, the influence of it on the overlying brine ore bed is discussed. The fine clastic rocks in the lower part of the M2 borehole in the Jitai Basin are characterized by LREE enrichment and gentle HREE, and they all show obvious negative Eu anomaly. Based on La/Th-HF and Zr-TiO2 diagram, they are mainly from the mixed source area of felsic/basic magmatic rocks and ancient sedimentary components, which brings abundant deep source materials for the formation of brine. The contents and ratios of trace elements and rare earth elements (La/Th, Cr/Th, Th/Sc) reflect the tectonic background characteristics of passive continental margin. The chemical weathering index (CIA, CIW, PIA and ICV) and the diagram of Al2O3-(CaO+Na2O)-K2O show that the chemical weathering degree is high, which is conducive to the migration and enrichment of elements, and provides rich ore-forming elements for the formation of brine deposits. |
| YAN Kai,WANG Chun-lian,WANG Jiu-yi,SHEN Li-jian,YU Xiao-can,MENG Ling-yang.2022.Provenance, Tectonic Setting and Palaeo-weathering of Black Carbonaceous Mudstones from Carboniferous Huanglong Formation in the Jitai Basin: Evidence from Stable Element Geochemistry[J].Acta Geoscientica Sinica,43(3):325-337. |
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