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| DOI | 10.1130/B36924.1 |
| The formation of a giant post-collision porphyry copper system: A case study of the Jiama deposit, Tibet | |
| 发表日期 | 2024 |
| ISSN | 0016-7606 |
| EISSN | 1943-2674 |
| 起始页码 | 136 |
| 结束页码 | 3-4 |
| 卷号 | 136期号:3-4 |
| 英文摘要 | The large magma reservoirs underlying world -class porphyry deposits are one of the key factors in their formation, which thus led to the present study focusing on the unmineralized intrusive rocks underlying the porphyry molybdenum -copper orebody of the post-collisional Jiama porphyry-skarn copper-polymetallic deposit in southern Tibet. The Jiama porphyry intrusion comprises intermediate -silica quartz diorite, monzogranite, and granodiorite porphyries, as well a high -silica granite porphyry. The intrusive rocks suite exhibits similar whole -rock SrNd isotopic compositions [epsilon Nd(t) = -3.9 to -0.8], suggesting a common, non-radiogenic magma source. Yet, these rocks have distinct geochemical characteristics. The intermediate -silica rocks are relatively enriched in Ba and Sr with minor Eu anomalies, and show adakite-like geochemical characteristics. In contrast, the high -silica granite porphyry is strongly depleted in Ba, Sr, and Eu, and lacks adakite-like geochemical characteristics. We propose that the high -silica granite porphyry represents highly fractionated melt extracted from a silicic mush reservoir (crystallinity of similar to 40%-65%), and that the monzogranite and granodiorite porphyries constitute the complementary residual silicic cumulates. High crystallinity facilitates the formation of connected fluid pathways, allowing the efficient removal of volatiles from the remaining silicic melt and a rapid flux of the ore-forming fluids toward the apical parts of the large magma reservoir. Less-evolved mafic melt is believed to have repeatedly intruded the base of the magma reservoir, thereby releasing volatiles and water into the silicic mush systems. The volatiles migrated upward through the fluid channels and accumulated in the apical part of the magma reservoir, subsequently, as result of the overpressure in the roof zone, ore-forming fluids and successive batches of magma were expelled together, thereby forming the Jiama porphyry-skarn deposit. |
| 语种 | 英语 |
| WOS研究方向 | Geology |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS记录号 | WOS:001186866600007 |
| 来源期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/287254 |
| 作者单位 | Ministry of Natural Resources of the People's Republic of China; China Geological Survey; Chinese Academy of Geological Sciences; China University of Geosciences; University of Erlangen Nuremberg; Laval University; Southwest University of Science & Technology - China; China Earthquake Administration |
| 推荐引用方式 GB/T 7714 | . The formation of a giant post-collision porphyry copper system: A case study of the Jiama deposit, Tibet[J],2024,136(3-4). |
| APA | (2024).The formation of a giant post-collision porphyry copper system: A case study of the Jiama deposit, Tibet.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,136(3-4). |
| MLA | "The formation of a giant post-collision porphyry copper system: A case study of the Jiama deposit, Tibet".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 136.3-4(2024). |
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