The key constraints on large-scale mineralization of Cenozoic potassic alkaline rocks in the Eastern Tibet-Sanjiang Belt
文献类型：期刊论文
| 作者 | Huang, WenTing5,6; Wang, JingTao6; Xia, XiaoPing4,5 ; Ci, Luo3; Luosang, JianCuo2; Yang, Yang2; Zhu, JiTao1; Liang, HuaYing5
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| 刊名 | ACTA PETROLOGICA SINICA
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| 出版日期 | 2025-02-01 |
| 卷号 | 41期号:2页码:693-710 |
| 关键词 | Sanjiang Belt Porphyry deposits Zircon water content Ore-forming factors |
| ISSN号 | 1000-0569 |
| DOI | 10.18654/1000-0569/2025.02.19 |
| 英文摘要 | During the Cenozoic Indo-Asian continental collision, a 1500km long, north-south oriented potassium-rich magmatic belt emerged in the Eastern Tibet-Sanjiang region. In this belt's northern sector, magmatic activity produced the extensive Yulong porphyry ore belt, while only sporadic deposits appeared in the central and southern sectors. This study employs SIMS water and oxygen isotope analyses, LA-ICP-MS trace element analyses, and Lu-Hf isotope analyses on primary zircon grains from three potassium-rich, barren rocks located in the middle and southern parts of the Sanjiang Belt. By comparing these with contemporaneous ore-forming porphyries in the Yulong ore belt, we delve into critical factors influencing large-scale porphyry mineralization of potassium-rich rocks in the Eastern Tibet-Sanjiang Belt. Our results reveal that zircon epsilon(Hf)(t) values (-6.00 to 2.70, average -2.94) from the barren rocks are significantly lower than those from fertile porphyries (-3.37 to 6.63, average 2.68), indicating that magmatic sources in the central and southern sectors have more ancient crustal material, while the northern sector's source is enriched with juvenile crustal material. Zircon grains of the three barren rocks display high H2O and OH-contents (average (734 +/- 184)x10(-6) and (14 +/- 4)apfux1000), akin to those from the giant porphyry deposit (average (640 +/- 213)x10(-6) and (12 +/- 5)apfux1000), and much higher than those from the medium-sized porphyry deposit (average (335 +/- 181)x10(-6) and (5.3 +/- 3)apfux1000) in the Yulong belt. Elevated zircon H2O contents in the barren rocks are primarily influenced by high pressures during zircon crystallization, which resulted from the regional high-pressure stress background and deep magmatic storage depths. These factors inhabited early fluid exsolution from the magmas, as indicated by the absence of fluid inclusions in zircons from the barren rocks, subsequently impeding metal extraction and porphyry mineralization. In summary, we propose that juvenile crust-rich sources, extensive regional stress, and early fluid exsolution of water-rich magmas collectively facilitated the large-scale porphyry mineralization of Cenozoic potassium-rich magmas in the Sanjiang Belt's northern segment. Additionally, the inputs of mantle-derived ore-rich potassic magmas controlled the porphyry mineralization and its spatial distribution in the belt's central and southern segments. Moreover, our approach suggests that zircon H2O is regulated by regional stress fields, storage depths, and magmatic water content. Zircons from different tectonic setting formed under different regional stresses, thus caution should be exercised when interpreting the zircon water contents. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001417074100004 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/82657]  |
| 专题 | 中国科学院广州地球化学研究所 |
| 通讯作者 | Xia, XiaoPing |
| 作者单位 | 1.Qinghai Xiwang Min Dev Co Ltd, Dulan 816100, Peoples R China 2.Tibet Xianglong Min Co Ltd, Xigaze 858532, Peoples R China 3.Geol & Mineral Explorat & Dev Bur Tibet Autonomous, Geol Team 6, Lhasa 851400, Peoples R China 4.Yangtze Univ, Coll Resources & Environm, Hubei Key Lab Petr Geochem & Environm, Wuhan 430100, Peoples R China 5.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 6.City Polytech Shenzhen, Sch Jewelry, Shenzhen 518116, Peoples R China |
| 推荐引用方式 GB/T 7714 | Huang, WenTing,Wang, JingTao,Xia, XiaoPing,et al. The key constraints on large-scale mineralization of Cenozoic potassic alkaline rocks in the Eastern Tibet-Sanjiang Belt[J]. ACTA PETROLOGICA SINICA,2025,41(2):693-710. |
| APA | Huang, WenTing.,Wang, JingTao.,Xia, XiaoPing.,Ci, Luo.,Luosang, JianCuo.,...&Liang, HuaYing.(2025).The key constraints on large-scale mineralization of Cenozoic potassic alkaline rocks in the Eastern Tibet-Sanjiang Belt.ACTA PETROLOGICA SINICA,41(2),693-710. |
| MLA | Huang, WenTing,et al."The key constraints on large-scale mineralization of Cenozoic potassic alkaline rocks in the Eastern Tibet-Sanjiang Belt".ACTA PETROLOGICA SINICA 41.2(2025):693-710. |
入库方式： OAI收割
来源：广州地球化学研究所
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