与朝山金矿有关岩体地质地球化学特征  

GEOLOGICAL AND GEOCHEMICAL CHARACTERISTICS OF ROCK MASS RELATED WITH GOLD MINERALIZATION IN THE CHAOSHAN DEPOSIT

作　　者：徐兆文[1] 方长泉[1] 陆现彩[1] 宋敬祥[1] 陆建军[1] 华明[1] 黄顺生[2] 聂桂平[2] 朱士鹏[2] 

机构地区：[1]南京大学内生金属矿床成矿机制国家重点实验室南京大学地球科学系,南京210093 [2]江苏省地质调查研究院,南京210018

出　　处：《地质与勘探》2004年第3期42-46,共5页Geology and Exploration

基　　金：国家自然科学基金(编号:49873016);高等学校博士点研究基金(编号:20020284035)联合资助。

摘　　要：朝山金矿床与白芒山辉石闪长岩有直接的成因联系。岩石的主量元素分析结果表明:Si2O含量为50 8%～54 58%,Na2O+K2O为6 58%～7 38%,K2O/Na2O为0 62～1 12,全碱—硅投影显示朝山岩体岩性为辉石闪长岩;微量元素分析结果显示Au、Ag、Cu、Pb、Zn成矿元素含量较高;稀土元素球粒陨石标准化曲线显示轻稀土富集而重稀土亏损;δEu介于0 75%～0 85%之间,说明辉石闪长岩分异演化程度不高。结合矿床地质特征,推测朝山金矿成矿流体和成矿物质主要来源于岩浆,在热液充填交代和夕卡岩化复合作用下,促使热液流体中的金沉淀成矿。Chaoshan gold deposit is directly related to augite diorite. The analyzing results of major elements show that the content of Si2O is from 50.86% to 54.58%, Na2O+K2O from 6.58% to 7.38%, and K2O/ Na2O from 0.62 to 1.12. Total alkali-silicon projection of major elements reveals the rock mass in Chaoshan is augite diorite. The analyzing results of microelements show that the contents of Au, Ag, Cu, Pb and Zn are very higher. Metallogenic materials come mainly from magma. The chondrite standard curve of rare earth elements reveals a deficit of light rare earth and enrichment of heavy one. δEu is from 0.75 to 0.85, showing a low degree of differential evolution of the rock mass. The rock mass is the important source of metallogenic materials and ore-forming fluids. Gold deposited from ore-forming fluids by hydrothermal infilling and skarnization.

关 键 词：地质 地球化学 辉石闪长岩 朝山金矿床 安徽铜陵 

分 类 号：P632[天文地球—地质矿产勘探] P618.51[天文地球—地质学]