| 东准噶尔北缘老山口铁铜金矿床古生代岩浆岩锆石U-Pb年代学、氧逸度特征及地质意义 |
| |
| 引用本文： | 梁培,陈华勇,吴超,刘振江. 东准噶尔北缘老山口铁铜金矿床古生代岩浆岩锆石U-Pb年代学、氧逸度特征及地质意义[J]. 地学前缘, 2018, 25(5): 96-118. DOI: 10.13745/j.esf.sf.2018.4.2 |
| |
| 作者姓名： | 梁培 陈华勇 吴超 刘振江 |
| |
| 作者单位： | 1. 中国科学院 广州地球化学研究所 矿物学与成矿学重点实验室, 广东 广州 5106402. 中国科学院大学, 北京 1000493. 新疆地质矿产开发局 第四地质大队, 新疆 阿勒泰 831140 |
| |
| 基金项目： | 国家重点基础研究发展计划“973”项目(2014CB440802)；中国科学院交叉学科项目(Y433131A07)；中国科学院创新团队国际合作项目(20140491534) |
| |
| 摘 要： | 老山口矿床位于新疆东准噶尔北缘，是区域内重要的铁铜金矿床。矿区内岩浆岩发育广泛，对其中的奥陶纪玄武安山岩(约449 Ma)，奥陶纪安山岩(约447 Ma)，泥盆纪火山岩(393~376 Ma)、二长闪长岩(约379 Ma)、黑云母闪长岩(约379 Ma)、石英正长岩(约376 Ma)、细粒闪长岩(约370 Ma)，石炭纪碱性花岗岩(约330 Ma)和粗粒闪长玢岩(约310 Ma)进行了成岩年代学的统计和测试，结果表明老山口矿床存在3期岩浆活动：450~440 Ma、约390~370 Ma以及330~310 Ma。结合区域构造演化可知，其中450~440 Ma和390~370 Ma的岩浆活动形成于不同时期俯冲相关的岛弧环境，而330~310 Ma的岩浆活动则形成于后碰撞板内伸展环境。根据铜金矿化的时代，可将矿区内的岩浆岩分为3期：成矿前、同成矿及成矿后。老山口同成矿期岩浆岩(泥盆纪火山岩、二长闪长岩、闪长玢岩和黑云母闪长岩)具有相对较高的(Eu/Eu*)N、(Ce/Ce*)N和CeⅣ/CeⅢ值，分别为0.13~0.86、1.14~445.92和33.34~1 165.04，说明铁铜金矿化与高氧逸度的岩浆活动有关。
|
| 关 键 词： | 东准噶尔北缘 老山口铁铜金矿床 锆石U-Pb年代学 锆石微量元素 氧逸度 |
| 收稿时间： | 2018-02-08 |
Geochemistry,geochronology and oxygen fugacity of volcanic and intrusive rocks from the Laoshankou Fe-Cu-Au deposit in the northern margin of East Junggar,NW China. |
| |
| LIANG Pei,CHEN Huayong,WU Chao,LIU Zhenjiang. Geochemistry,geochronology and oxygen fugacity of volcanic and intrusive rocks from the Laoshankou Fe-Cu-Au deposit in the northern margin of East Junggar,NW China.[J]. Earth Science Frontiers, 2018, 25(5): 96-118. DOI: 10.13745/j.esf.sf.2018.4.2 |
| |
| Authors: | LIANG Pei CHEN Huayong WU Chao LIU Zhenjiang |
| |
| Affiliation: | 1. Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. No.4 Geological Party of the Xinjiang Bureau of Geology and Mineral Exploration and Development, Altay 836500, China; |
| |
| Abstract: | The Laoshankou deposit is an important Fe-Cu-Au deposit in the northern margin of the East Junggar, NW China. LA-ICP-MS U-Pb dating of zircon constrains the timing of crystallization of Ordovician basaltic andesite (~449 Ma), Ordovician andesite (~447 Ma), Devonian volcanic rocks (393376 Ma), monzodiorite (~379 Ma), biotite diorites (~379 Ma), quartz syenites (~376 Ma), fine-grained diorite (~370 Ma), alkali granite (~330 Ma) and coarse-grained diorite porphyry (~310 Ma). Zircon dating indicates three periods of magmatism in Laoshankou: 450440 Ma, ~390370 Ma and 330310 Ma. The magmatism for the first two periods occurred in a subduction-related island arc setting; the magmatism for the last one occurred in a post-collision or inplate extensive setting. Pre-, syn- and post-mineralization volcanic and intrusive rocks are divided based on the Fe-Cu-Au mineralization timing. Syn-mineralization intrusions in Laoshankou have relatively high (Eu/Eu*)N, (Ce/Ce*)N and CeIV/CeIII values of 0.130.86, 1.14445.92 and 33.341165.04, respectively, indicating Fe-Cu-Au mineralization was associated with high oxygen fugacity magmatism. |
| |
| Keywords: | northern margin of East Junggar Laoshankou Fe-Cu-Au deposit zircon U-Pb geochronology zircon trace elements oxygen fugacity |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地学前缘》浏览原始摘要信息 |
|
点击此处可从《地学前缘》下载全文 |
|
