| 焦建刚.东天山图拉尔根Ⅲ号岩体锆石年龄及地质意义[J].地质与勘探,2013,49(3):385-393 |
| 东天山图拉尔根Ⅲ号岩体锆石年龄及地质意义 |
| SHRIMP Zircon U-Pb Age of the No.3 Intrusion in the Tulargen Cu-Ni Mining Area, East Tianshan Mountains, Xinjiang, and its Geological Significance |
| 投稿时间：2012-07-07 修订日期：2012-12-30 |
| DOI： |
| 中文关键词: 铜镍硫化物矿床 成因联系 成矿潜力 图拉尔根 东天山 |
| 英文关键词: Cu-Ni sulfide deposits, genetic relationship, metallogenic process, Tulargen, Eastern Tianshan |
| 基金项目:中央高校基本科研业务费专项资金（编号：CHD2012JC014）、国家自然科学基金项目（编号：41072058）与公益性行业科研专项（编号：200911007,201011058）联合资助。 |
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| 中文摘要: |
| [摘要] 东天山地区图拉尔根大型铜镍硫化物矿床矿区有三个镁铁—超镁铁质岩体。Ⅰ号岩体（矿床）岩相由角闪橄榄岩、橄榄辉石岩、辉石岩与辉长岩组成，不同岩相之间为过渡接触；不同岩相样品的稀土元素配分曲线图显示平行过渡变化，证明各岩相是同一个岩浆系列演化。Ⅱ、Ⅲ号岩体由辉长岩组成，相对Ⅰ号岩体富集Ti、P，具有明显的Zr、Hf亏损，微量稀土元素配分曲线存在明显差异，证明图拉尔根Ⅰ号岩体（矿床）与北部Ⅱ、Ⅲ号辉长岩体不是同一个岩浆源区演化的产物。Ⅰ号岩体的成岩年龄为300.5±3.2Ma，Ⅱ号及Ⅲ号辉长岩体形成于357.5±2.5Ma与351±4Ma,虽然这三个岩体走向一致，但年代相差大于50Ma, 前者对应于东天山地区后碰撞伸展期（320-252Ma），属于拉伸环境，后者对应于区域主碰撞期（349-330Ma），属于挤压环境。 |
| 英文摘要: |
| Abstract?: The Tulargen large-scale Ni-Cu sulfide deposit hosts 3 mafic-ultramafic intrusions. The No.1 intrusion is mainly composed of amphibole peridotite, olivine pyroxenite, pyroxenite and gabbro, and the transition boundaries can be found between different lithofacies. The chondrite normalized REE diagrams show parallel lines of different lithoface samples, indicating different lithofacies have experienced the same evolution series. However, the No. 2 and No. 3 intrusions are mostly gabbro, which are much richer in Ti and P than No.1 intrusion. The chondrite normalized REE diagrams and primitive mantle normalized trace elements patterns of the No.2,3 intrusions show negative Zr and Hf anomalies, which are different from the No.1 intrusion. The No.1 intrusion has experienced different magma evolution processes from the No.2,3 intrusions. The newest zircon dating shows 300.5±3.2Ma for the No.1 intrusion (ore deposit), 357.5±2.5Ma and 351±4Ma for the No.2,3 intrusions respectively. Although the No.1,2 and 3 intrusions are very close and parallel distribution, the ages are more than 50Ma different between No.1 and No.2,3 intrusions, suggesting they are formed by different geologic events. According to regional magma events, the age of the No.1 intrusion is consistent with post-collision extension setting in the east Tianshan district（320-252Ma）, and the No.2 and 3 intrusions are accordant to the main collision squeezing setting in the east Tianshan district（349-330Ma）. |
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