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| 甘肃辉铜山铜矿床燕山期钾长花岗岩的发现及其地质意义 | |
| 引用本文： | 江思宏,聂凤军,陈文,刘妍,白大明,刘新宇,张思红.甘肃辉铜山铜矿床燕山期钾长花岗岩的发现及其地质意义[J].矿床地质,2003,22(2):185-190. |
| 作者姓名： | 江思宏 聂凤军 陈文 刘妍 白大明 刘新宇 张思红 |
| 作者单位： | 1. 中国地质科学院矿产资源研究所,北京,100037 2. 中国地质科学院地质研究所,北京,100037;中国地质大学地球科学和资源学院,北京,100083 3. 中国地质科学院地质研究所,北京,100037 |
| 基金项目： | 国家自然科学基金 ( 4 0 0 73 0 15 )，国土资源大调查项目 (K1.3 .3 2 )的联合资助 |
| 摘 要： | 文章对辉铜山铜矿床内的钾长花岗岩进行了岩石化学分析、钕同位素测量和高精度的40 Ar/ 3 9Ar法年龄测定。结果表明 ,钾长花岗岩的形成时代为 (192± 3)Ma ,相当于燕山早期 ,它们具有A型花岗岩的特征 ;成岩物质来自地幔 ,并遭受了地壳物质的混染。岩浆侵位可能与本区在燕山早期发生的陆内伸展有关 |
| 关 键 词： | 甘肃 铜矿床 钾长花岗岩 燕山期 岩石化学分析 钕同位素 ^40Ar／^39Ar法年龄 形成时代 |
| 文章编号： | 0258-7106(2003)02-0185-06 |
Discovery of Yanshanian K_feldspar Granite in Huitongshan Copper Deposit, Gansu Province, and Its Implication |
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| Jiang Sihong ,Nie Fengjun ,Chen Wen ,Liu Yan ,Bai Daming ,Liu Xinyu and Zhang Sihong.Discovery of Yanshanian K_feldspar Granite in Huitongshan Copper Deposit, Gansu Province, and Its Implication[J].Mineral Deposits,2003,22(2):185-190. | |
| Authors: | Jiang Sihong Nie Fengjun Chen Wen Liu Yan Bai Daming Liu Xinyu and Zhang Sihong |
| Institution: | Jiang Sihong 1,Nie Fengjun 1,Chen Wen 2,3,Liu Yan 1,Bai Daming 1,Liu Xinyu 2 and Zhang Sihong 2 |
| Abstract: | Located in the southern part of the Beishan Mountain, the Huitongshan deposit is an important skarn type copper deposit in this region. The orebodies occur in the contact zone between the K-feldspar granite and the CM(46]marble of the Middle-Lower Ordovician Huaniushan Group. The ore-forming age of the deposit has not been determined since its discovery in 1956. According to the 40Ar/39Ar isotopic dating of the K-feldspar from the K-feldspar granite, the plateau age is (192±3) Ma. It indicates that the Huitongshan copper deposit was formed at 190 Ma or so. The petro-chemical data of the K-feldspar granites in Huitongshan and Huaniushan areas show that these K-feldspar granites belong to A type granites. The Nd isotopic data further demonstrate that these K-feldspar granites were derived from the mixture of the mantle and crust-derived materials. The emplacement of these K-feldspar granites was related to the intracontinental extension during early Yanshanian tectonic movement. As the Au, Pb, Zn, Cu and Mo deposits are associated with the K-feldspar granites in the region, a detailed study of the K-feldspar granites is helpful not only to understanding the tectonic evolution but also to guiding the evaluation and exploration of regional mineral resources. |
| Keywords: | geochemistry 40 Ar/ 39 age dating K_feldspar granite skarn type of copper deposit Huitongshan Gansu |
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