| 贵州普安矿区晚二叠世煤中贵金属元素的赋存状态和地质成因 |
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| 关键词:coal noble metal elements mode of occurrence pyrite low-temperature hydrothermal fluid |
| 基金项目:国家重点基础研究发展计划(编号:2006CB202201); 陕西省教育厅自然科学基金项目(编号:DK01jk145); 陕西科技厅自然科学基金项目(编号:2004D02) |
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| Modes of Occurrence and Geological Origins of Noble Metal Elements in Late Permian Coals from the Pu'an Coalfield, Guizhou Province |
| The concentrations, modes of occurrence, and origins of noble metal elements in Late Permian coals from the Pu' an coalfield were studied by using inductively coupled plasma-mass spectrometry (ICP-MS) and sequential chemical extraction technology (SECT). The results show that the minerals in No. 2 coal seam of the Pu' an coalfield are dominated by pyrite of low-temperature hydrothermal origin and clay minerals of detrital terrigenous origin. Compared with coals of China, Rh (38 ng/g), Pd (640 ng/g), Ir (9 ng/g), Pt (98 ng/g), Au (16 ng/g), and Ag (1620 ng/g) are significantly high in No.2 coal seam. The concentrations of Pd, Ir, and Au in No.2 coal seam are 4.3, 9, and 5.3 times higher than those in coals of China, respectively. The SECT results indicate that the noble metals concentrated in No.2 coal seam mainly exist in the sulfide association state. The concentrations of Rh, Pd, Ir, Pt, Au, and Ag in the sulfide association are 720 ng/g, 15000 ng/g, 310 ng/g, 2380 ng/g, 360 ng/g, and 32300 ng/g,respectively. However, the concentrations of noble metals occurring in organic and silicate associations were lower than or close to their background values in coal. The low-temperature hydrothermal fluids must have played a dominant role in the enrichment of noble metals in the coal. |
| YANG Jian-ye.2007.Modes of Occurrence and Geological Origins of Noble Metal Elements in Late Permian Coals from the Pu'an Coalfield, Guizhou Province[J].Acta Geoscientica Sinica,28(3):277-282. |
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