| 冈底斯: 东西超过一千千米的中新世斑岩-矽卡岩-浅成低温热液型铜矿带 |
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| 关键词:Tibetan Plateau Gangdese epithermal porphyry copper deposit |
| 基金项目:中国地质调查局新一轮找矿突破“铜(金)锑等紧缺战略性矿产调查与潜力评价”项目(编号: DD20230054)；国家自然科学基金面上基金“斑岩-高硫型浅成低温热液铜金成矿系统的砂金矿物学标志”项目(编号: 42172100) |
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| Gangdese: A Miocene Porphyry-skarn-epithermal Copper Belt over 1 000 km from East to West |
| The central and eastern part of Gangdese magmatic arc is rich in copper deposits. To the west of 88°E in longitude, the potential and prospecting of copper resources have always been key focus both in academic and industrial circles. Under the guidance of the metallogenic series theory, mineral geological survey was conducted in the continental volcanic rock area in northwest Xizang, and drilling was carried out in the altered volcanic clastic rocks of the Miocene Gazhacun Formation. It revealed a thick (>550 m) advanced argillic alteration zone and a copper (gold and silver) orebody with a thickness of 137 m and an average Cu grade of 0.46%. This achieved a major breakthrough in copper exploration in the western section of Gangdese. The Zhule–Mangla area has typical high-sulfidation epithermal mineralization and alteration mineral assemblages, which belong to the new type of copper deposits in the Tibetan Plateau. Geochemical studies of the volcanic rocks aged approximately 17 Ma in the Zhule–Mangla area reveal that the Miocene potassic calc-alkaline magmatic rocks of Gangdese exhibit relatively consistent petrogeochemical characteristics. This is associated with the partial melting of the lower crust in the post-collision extensional tectonic setting of the India–Asia collision. Therefore, the discovery of the high-sulfidation epithermal copper deposit in Mangla extends the Gangdese Miocene porphyry-skarn-epithermal copper belt westward by nearly 1 000 km, and opens a new direction for searching for collisional porphyry-epithermal copper deposits in the continental volcanic rock region. |
| SONG Yang,TANG Juxing,LIU Zhibo,WANG Nan,YAN Xukun,XIE Fuwei,MA Xudong,SUN Hao.2025.Gangdese: A Miocene Porphyry-skarn-epithermal Copper Belt over 1 000 km from East to West[J].Acta Geoscientica Sinica,46(1):15-19. |
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