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| DOI | 10.5382/econgeo.5054 |
| MULTIPULSED MAGMATISM AND DURATION OF THE HYDROTHERMAL SYSTEM OF THE GIANTJIAMA PORPHYRY Cu SYSTEM, TIBET, CHINA | |
| 发表日期 | 2024 |
| ISSN | 0361-0128 |
| EISSN | 1554-0774 |
| 起始页码 | 119 |
| 结束页码 | 1 |
| 卷号 | 119期号:1 |
| 英文摘要 | Jiama is the largest porphyry-skarn ore system in the Gangdese metallogenic belt, Tibet. It is composed of porphyry Cu -Mo, Cu-polymetallic skarn, Cu -Pb -Zn manto, and distal vein Au orebodies with associated Ag, W, and Bi. However, the precise timing of the magmatism and hydrothermal events at Jiama remains obscure. Here, using high-precision chemical abrasion -isotope dilution -thermal ionization mass spectrometry (CA-ID-TIMS) U -Pb zircon dating of ore-bearing and post -ore intrusions, we accurately constrain the lifespan of magmatism and hydrothermal mineralization. Monzogranite porphyry dikes are cut by Cu -Mo vein mineralization in the deeper part of the system, indicating that they were emplaced pre -ore, and yield a crystallization age of 15.534 +/- 0.007 Ma (mean square of weighted deviates [MSWD] = 0.99, n = 6). A granodiorite porphyry that cuts the monzogranite porphyry and hosts vein and disseminated chalcopyrite and molybdenite is considered synchronous with ore and yields a crystallization age of 15.368 +/- 0.007 Ma (MSWD = 1.01, n = 5). These two phases of intrusions are cut by quartz-diorite porphyry bodies, which yield a crystallization age of 15.076 +/- 0.006 Ma (MSWD = 0.13, n = 6) and contain weak, subeconomic Cu and almost no molybdenum mineralization. A post -ore barren quartz monzonite porphyry yields a crystallization age of 14.925 +/- 0.006 Ma (MSWD = 1.12, n = 6). The lifespan of magmatism at Jiama is thus about 0.61 m.y. The difference with previous molybdenite Re -Os isochron ages from the porphyry (14.7 +/- 0.3 Ma), hornfel (14.7 +/- 0.4 Ma), and skarn (15.4 +/- 0.2 Ma) suggests that high-precision chronology is required to decipher accurate timing of mineralization in porphyry systems such as Jiama. The 40 Ar/ 39 Ar ages of hydrothermal biotite coexisting with molybdenite in monzogranite porphyry and hornfels are 15.25 +/- 0.17 Ma (MSWD = 1.6) and 15.25 +/- 0.24 Ma (MSWD = 0.14), respectively, slightly younger than the granodiorite porphyry and older than weakly mineralized quartz diorite porphyry, which represents the time of the ore -forming hydrothermal event. Thus, Jiama is the product of pulsed magmatism during which a short-lived hydrothermal event formed the giant Cu polymetallic system. |
| 语种 | 英语 |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| WOS类目 | Geochemistry & Geophysics ; Mineralogy |
| WOS记录号 | WOS:001214260200003 |
| 来源期刊 | ECONOMIC GEOLOGY
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/291597 |
| 作者单位 | China Geological Survey; Chinese Academy of Geological Sciences; China Geological Survey; Chinese Academy of Geological Sciences; Laval University; Southwest University of Science & Technology - China; China University of Geosciences; China Geological Survey; Chengdu Center, China Geological Survey; Chengdu University of Technology; University of British Columbia |
| 推荐引用方式 GB/T 7714 | . MULTIPULSED MAGMATISM AND DURATION OF THE HYDROTHERMAL SYSTEM OF THE GIANTJIAMA PORPHYRY Cu SYSTEM, TIBET, CHINA[J],2024,119(1). |
| APA | (2024).MULTIPULSED MAGMATISM AND DURATION OF THE HYDROTHERMAL SYSTEM OF THE GIANTJIAMA PORPHYRY Cu SYSTEM, TIBET, CHINA.ECONOMIC GEOLOGY,119(1). |
| MLA | "MULTIPULSED MAGMATISM AND DURATION OF THE HYDROTHERMAL SYSTEM OF THE GIANTJIAMA PORPHYRY Cu SYSTEM, TIBET, CHINA".ECONOMIC GEOLOGY 119.1(2024). |
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