K-Ar and Ar-40/-Ar-39 age dating of Nimu porphyry copper orefield in Central Gangdese: Constrains on magmatic-hydrothermal evolution and metallogenetic tectonic setting
文献类型：期刊论文
| 作者 | Li JinXiang; Qin KeZhang; Li GuangMing; Yang LieKun |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2007-05-01 |
| 卷号 | 23期号:5页码:953-966 |
| 关键词 | Gangdese porphyry copper belt Nimu metallogenetic cluster Ar-40/Ar-39 dating K-Ar age dating porphyries sequence magmatic-hydrothermal evolution tectonic setting |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | Gangdese porphyry copper metallogenetie belt, distinct from classical porphyry copper deposits that were occurred in island arc and continent margin setting, were formed in post-collision setting and showed considerable prospective. This article systematically researches the porphyries of Bairong and Tinggong porphyry deposits from Nimu metallogenetic cluster, and confirms its evolving and intrusive sequence from monzogranite to ore-forming monzogranite porphyry to quartz diorite porphyrite to granodiorite porphyry. The K-Ar age for phenocrystic hornblende in porphyroid monzogranite from Bairong copper deposit is 16.9 +/- 2.4Ma. The K-Ar ages for phenocrystic biotites in quartz diorite porphyrite and granodiorite porphyry are 12.3 +/- 0.2Ma and 11.5 +/- 0.2Ma from Bairong porphyry deposit, 13.8 +/- 0.2Ma and 13.5 +/- 0.3Ma from Tinggong porphyry deposit, correspondingly, its Ar-40/Ar-39 plateau ages are 12.5 +/- 0.2Ma and 12.4 +/- 0.2Ma, 14.9 +/- 0.2Ma and 14.2 +/- 0.2Ma respectively. These ages indicate quartz diorite porphyrite formed after porphyroid monzogranite, whereas before granodiorite porphyry. The ore-forming process is related to monzogranite porphyry, which the forming age is later than porphyroid monzogranite and slightly earlier than quartz diorite porphyrite and granodiorite porphyry. Sufficient differentiation and evolvement of the complexes contribute to the concentration of ore-forming fluid and gradually enrichment to ore in Nimu metallogenetic cluster. The K-Ar age and Ar-40/Ar-39 plateau age for hydrothermal sericites from altered monzogranite porphyry respectively yield 11.8 +/- 0.2Ma and 12.0 +/- 0.1 Ma in Bairong porphyry copper deposit, and represent the forming age of medium-low temperature alteration and late-mineralization, and its alteration age was consistent with the Ar-40/Ar-39 plateau ages for phenocrystie biotites in quartz diorite porphyrite and granodiorite porphyry from Bairong porphyry copper deposits and published molybdenite Re-Os age was consistent with the Ar-40/Ar-39 plateau ages for phenocrystic biotites in quartz diorite porphyrite and granodiorite porphyry from Tinggong porphyry copper deposit, which imply that the magma cooling and crystallization of quartz diorite porphyrite and granodiorite porphyry from Bairong and Tinggong porphyry copper deposits overlapped temporally with hydrothermal mineralization. Combined with the published ages, the duration limit of Bairong porphyry deposit approximately range from 0. 5 to 5Ma, and approximate to 4Ma for Tinggong porphyry deposit, approximate to 5Ma for Chongjiang. The emplacement of porphyries sequence from Nimu metallogenetic cluster was later than post-collisional rapid uplift of Gangdese approximate to 21 Ma and approximate to 15 Ma the normal fault began to form in Central Gangdese, indicated ore-forming porphyries possibly emplaced the tectonic setting from thickened crust and the rapid uplift of Gangdese mountain to initial extension, namely, the porphyry copper deposits possibly occur in a transition tectonic setting between contractional deformation associated with Gangdese uplift and the initial onset of east-west striking extension. |
| WOS关键词 | EAST-WEST EXTENSION ; SOUTHERN TIBETAN PLATEAU ; VOLCANIC-ROCKS ; THERMAL EVOLUTION ; NORTHERN CHILE ; OROGENIC BELT ; U-PB ; COLLISION ; UPLIFT ; DEPOSITS |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000248135100009 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/67836]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Qin KeZhang |
| 作者单位 | Chinese Acad Sci, Inst Geol & Geophys, Key Lab Min Resources, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li JinXiang,Qin KeZhang,Li GuangMing,et al. K-Ar and Ar-40/-Ar-39 age dating of Nimu porphyry copper orefield in Central Gangdese: Constrains on magmatic-hydrothermal evolution and metallogenetic tectonic setting[J]. ACTA PETROLOGICA SINICA,2007,23(5):953-966. |
| APA | Li JinXiang,Qin KeZhang,Li GuangMing,&Yang LieKun.(2007).K-Ar and Ar-40/-Ar-39 age dating of Nimu porphyry copper orefield in Central Gangdese: Constrains on magmatic-hydrothermal evolution and metallogenetic tectonic setting.ACTA PETROLOGICA SINICA,23(5),953-966. |
| MLA | Li JinXiang,et al."K-Ar and Ar-40/-Ar-39 age dating of Nimu porphyry copper orefield in Central Gangdese: Constrains on magmatic-hydrothermal evolution and metallogenetic tectonic setting".ACTA PETROLOGICA SINICA 23.5(2007):953-966. |
入库方式： OAI收割
来源：地质与地球物理研究所
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