| 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 |
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| 引用本文：.2003.Discovery of Yanshanian K_feldspar Granite in Huitongshan Copper Deposit, Gansu Province, and Its Implication[J].Mineral Deposits,22(2):185~190 |
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| 基金项目:国家自然科学基金（40073015）和国土资源大调查项目（K1.3.32） |
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| 中文摘要: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40Ar/39Ar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。 |
| 中文关键词:地球化学 40Ar/39Ar测年 钾长花岗岩 夕卡岩型铜矿床 辉铜山 甘肃 |
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| Discovery of Yanshanian K_feldspar Granite in Huitongshan Copper Deposit, Gansu Province, and Its Implication |
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| 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, 40Ar/39Ar age dating, K-feldspar granite, skarn type of copper deposit, Huitongshan, Gansu |
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