| 东川式层状铜矿40Ar-39Ar成矿年龄研究：华南地区晋宁-澄江期成矿作用新证据 |
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| 引用本文：.2002.New 40Ar-39ArEvidence for Ore-forming Process During Jinning-Chengjiang Period in Dongchuan Type Copper Deposits, Yunnan[J].Mineral Deposits,21(2):129~136 |
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| 基金项目:国家自然科学基金(编号: 49972033)、国家973项目(编号: G1999043201)、国家攀登预选项目(编号: 95_YU_25) 和中国科学院大型仪器功能开发项目(编号: 9804A_077) |
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| 中文摘要:本文采用 40Ar-39Ar真空击碎技术和阶段加热技术，测定了采自落雪矿的“东川式”层状铜矿之两个石英样品的年龄，获得了810～770 Ma的40Ar-39Ar等时线年龄，这是首次获得的“东川式”铜矿的成矿年龄。这些年龄与作者以前获得的脉状铜矿石英的年龄范围一致，远远小于赋矿围岩落雪组的年龄。研究结果表明“东川式”层状铜矿并非沉积成因，与脉状铜矿一样，也是热液成因，并且再次证实晋宁-澄江期是东川铜矿的主要成矿期。 |
| 中文关键词:40Ar-39Ar法 流体包裹体 东川铜矿 晋宁 澄江期 |
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| New 40Ar-39ArEvidence for Ore-forming Process During Jinning-Chengjiang Period in Dongchuan Type Copper Deposits, Yunnan |
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| Abstract:Two quartz samples from the Dongchuan_type layered copper deposits in the Luoxue Mine were dated by 40Ar-39 crushing and heating techniques. Two age groups of～1470 Ma and 810～770 Ma are recognized from the 40Ar-39isochron plots. The age of ～1470 Ma, obtained from the isochron of the quartz 98-4aQ by vacuo crushing technique, is interpreted as the crystallization age of 98-4aQ from the hydrothermal fluid. The ages of 810～770 Ma, obtained from the 40Ar-39 isochrons of 98-4aQ by stepped heating and of 98-4fQ by crushing and stepped heating, seem quite in agreement with the 40Ar-39isochron ages of the quartz samples DC-50-3Q and DC_51_1Q by crushing and siliceous breccia DC-5-2 by heating selected from the quartz_vein ores, and are interpreted as the copper mineralization ages. These ore_forming ages further indicate that the major ore-forming process in the Dongchuan copper deposits took place in the Jinning-Chengjiang period. |
| keywords:40Ar-39 techniques, fluid inclusions, Jinning period, Chengjiang period, Dongchuan copper deposits |
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