| 中甸岛弧带构造格架及斑岩铜矿前景 |
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| 引用本文：曾普胜,王海平,莫宣学,喻学惠,李文昌,李体刚,李红,杨朝志.2004.中甸岛弧带构造格架及斑岩铜矿前景[J].地球学报,25(5):535-540. |
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| 基金项目:国土资源部资源与环境科技攻关项目(编号:950200102)，国土资源大调查项目(编号:2003102000014)，国家自然科学基金项目(编号:40272046)和973项目(编号:2002CB412610) |
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| 中文摘要:中甸岛弧带属于中国西南三江构造一岩浆一成矿带中义敦岛弧的南端，其中有2条蛇绿混杂岩带存在，即EW向展布的洛吉蛇绿混杂岩带和近NS向分布的属都蛇绿混杂岩带。前者是中甸岛弧带与扬子地台的构造分界线，而后者则将岛弧带内的东、西两个火山岛弧带分开。西部岛弧带较早，活动时期为250237Ma；而东部岛弧带相对较晚，活动时期在218203Ma。从岛弧带活动时段(250～203Ma)分析，属都蛇绿混杂岩带所对应的洋盆(属都洋)的活动时段当在250Ma之前后，与甘孜理塘洋活动时段相近。属于峨眉山大火成岩省的一部分。2条蛇绿混杂岩带内的玄武岩的岩石学特征均表现为大洋拉斑玄武岩。中甸地区岛弧带内东、西两个斑岩带的斑岩型铜矿的找矿远景极大，尤以东斑岩带前景最佳，普朗斑岩铜矿床远景规模在大型以上。中甸斑岩铜矿将成为中国又一重要的斑岩铜(多金属)矿矿产地，具有极好的找矿前景。 |
| 中文关键词:岛弧带 构造格架 斑岩 铜矿 找矿前景 中甸 |
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| Tectonic Setting and Prospects of Porphyry Copper Deposits in Zhongdian Island Arc Belt |
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| Abstract:Located in the south of Yidun island arc of theSanjiang tectonic-magmatic-metallogenic belt, southwestern China, the Zhongdian island arc belt includes two ophiolite-melange belts, i.e., EW-striking Louji ophiolite-melangebelt and Shudu ophiolite-melange belt. The former serves as the boundary between the Zhongdian island arc belt and the Yangtze platform whereas the latter dividesthe Zhongdian island arc belt into the western part and the eastern part. The western part is earlier (250～203 Ma) than the eastern part (218～203 Ma). An analysis of the duration (250～203 Ma) shows that the activity time of the Shudu Ocean,corresponding to Shudu ophiolite-melange belt, should be ca. 250 Ma, close to theactivity time of Garze-Litang suture. The Shudu ophiolite-melange belt and theGarze-Litang ophiolite-melange belt therefore belong to the Emeishan great igneous province. The lithology is characterized by tholeiite in both ophiolite-melange belts. Within the Zhongdian island arc zone, both the eastern porphyry belt and the western porphyry belt are of great potential in search for porphyry copper deposits. The Pulang Porphyry copper deposit is superlarge in size in potential of resources. The Zhongdian porphyry copper deposit is likely to become an important base area in copper-polymetallic resources of China. The exploration work is very promising. |
| keywords:Zhongdian island arc belt tectonic setting porphyry copper deposit potential of resources |
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