| 云南个旧锡铜多金属矿区新山和高峰山岩体中高温热演化史及其与成矿的关系 |
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| 引用本文： | 李宝龙,季建清,龚俊峰,周晶,毛景文.云南个旧锡铜多金属矿区新山和高峰山岩体中高温热演化史及其与成矿的关系[J].大地构造与成矿学,2016(6):1154-1173. |
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| 作者姓名： | 李宝龙 季建清 龚俊峰 周晶 毛景文 |
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| 作者单位： | 1. 中国地质科学院矿产资源研究所,国土资源部成矿作用与资源评价重点实验室,北京100037;2. 北京大学地球与空间科学学院,造山带与地壳演化教育部重点实验室,北京100871;3. 浙江大学地球科学系,浙江杭州,310027 |
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| 基金项目： | 中国地质调查局地质调查项目(12120114034301)，中央级科研院所基本科研业务专项(K1309) |
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| 摘 要： | 云南个旧是全球最大的锡铜多金属矿床,主要成矿作用是与燕山期花岗岩密切有关的岩浆–热液体系。本文依据锆石U-Pb测年和~(40)Ar/~(39)Ar年代学对矿区内新山和高峰山花岗岩体进行测试分析,数据揭示矿区内南部和北部的花岗岩体的高–中温阶段热演化史曲线具有相似的演化趋势,只是冷却时间存在3~6 Ma的间隔。南部新山岩体于89~85 Ma形成,此后岩体经历了快速冷却过程,冷却速率为58.70~62.08℃/Ma。之后进入中温400~250℃的缓慢冷却过程,冷却速率为17.39~19.32℃/Ma,并持续到68~69 Ma。北部岩体的热演化史曲线明显滞后于南部岩体,北部高峰山岩体于83~82 Ma形成,之后经历快速冷却过程,冷却速率为295.59℃/Ma和103.29℃/Ma,于80 Ma进入400~250℃,此后以冷却速率为7.14~5.69℃/Ma,进入极其缓慢冷却过程并持续至67 Ma。矿区内花岗岩体先遭受快速冷却后进入中温阶段的缓慢长时间冷却作用过程,为锡铜主期成矿作用提供了持续的热源和流体运移动力学过程,也与矿区南、北部的成矿作用差异相吻合。
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| 关 键 词： | 锆石LA-MS-ICP U-Pb定年 40Ar/39Ar年代学 热演化史 冷却速率 锡铜矿床 个旧 |
The High-Middle Thermal Evolution of Xinshan and Gaofengshan Granites and its Relationship with Mineralization in Gejiu Tin-Copper Polymetallic District |
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| Abstract: | Gejiu is one of the largest polymetallic tin ore-concentrating districts over the world,which is a granite-related magmatic-hydrothermal system.In this paper,the high-middle thermal evolutional history of granites was drew based on zircon U-Pb dating and 40Ar/39Ar geochronology.The analytical results revealed that the high-middle temperature phase thermal evolution history curves of south granite body and north granite body have the same trend,except a temporal lapse of 3-6 Ma.The Xinshan granite body in the south region of the Gejiu deposit has undergone rapid cooling with cooling rate of 58.70-62.08 ℃/Ma immediately subsequent to its formation at 85 Ma to 89 Ma,and then slowed down to temperature range of 400-250 ℃ with cooling rate of 17.39-19.32 ℃/Ma,this slow cooling process continued until 68-69 Ma;And the thermal evolution history of the Gaofengshan granite body in the north region of the Gejiu lags behind that of the south granite body.The Gaofengshan granite body formed at 83-82 Ma experienced rapid cooling with cooling rate of 295.59 ℃/Ma and 103.29 ℃/Ma,and the temperature dropped into 400-250 ℃ at 80 Ma,thereafter it fell into the extremely slow cooling process with rate of 7.14-5.69 ℃/Ma which continued into 67 Ma.The cooling mode of granite body that is rapid cooling at the beginning and then slow down and persists for a long period at middle temperature range plays a very important role in the formation of the Gejiu tin-copper polymetallic district.It provided a continuous source of heat and geodynamic drives for the regional mineralization,and this is also consistent with the temporal difference of the mineralization between the north and south parts of the Gejiu area. |
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| Keywords: | zircon LA-ICP-MS U-Pb dating 40Ar/39Ar geochronology thermal evolutional history cooling rate copper-tin deposit Gejiu |
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