| 青藏高原羌塘地体南缘浅成低温热液成矿系统的保存机制及其重要意义——以铁格隆南超大型矿床为例 |
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| 关键词:epithermal deposit porphyry deposit preservation uplift Bangong Co–Nujiang Tibet |
| 基金项目:国家自然科学基金项目(编号: 41402178);中国地质科学院基本科研业务费项目(编号: YYWF201608);国土资源部公益性行业科研专项(编号: 201511017);中国地质调查局二级项目(编号: DD20160026) |
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| The Preservation System of Epithermal Deposits in South Qiangtang Terrane of Central Tibetan Plateau and Its Significance: A Case Study of the Tiegelongnan Superlarge Deposit |
| The formation and preservation of the Mesozoic epithermal deposits are attributed to many coupling geological factors during the erosion of the Tibetan Plateau. The newly discovered Tiegelongnan Cu deposit in the western part of Bangong Co–Nujiang metallogenic belt in Tibet is a superlarge superimposed porphyry-epithermal deposit. The preservation of the Tiegelongnan deposit resulted from the covered Meiriqiecuo andesite formed after the mineralization according to the systematic geological log. The paleocrust of weathering developed between the orebody and andesite and the weak weathered eluvial, ancient soil, half-regolith deluvial was identified, which indicates the uplift and erosion of the Tiegelongnan deposit. The minimum denudation depth was 600~1 200 m in 118~111 Ma and the denudation rate was 0.1~0.2 mm/a with an average of 0.15 mm/a according to the indirect calculation of the metallogenic system protection. The ancient elevation of the Tiegelongnan deposit was about 2 000~2 500 m. The Tiegelongnan deposit formed at the last stage of the closure of the Bangong Co–Nujiang Ocean. The research in this paper has confirmed that southern Qiangtang terrane experienced an important denudation process in the late period of early Cretaceous and indicated the late period of early Cretaceous was an important period during the uplifting of Tibetan Plateau. |
| SONG Yang,YANG Huan-huan,LIN Bin,LIU Zhi-bo,WANG Qin,GAO Ke,YANG Chao,FANG Xiang.2017.The Preservation System of Epithermal Deposits in South Qiangtang Terrane of Central Tibetan Plateau and Its Significance: A Case Study of the Tiegelongnan Superlarge Deposit[J].Acta Geoscientica Sinica,38(5):659-669. |
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