广东长坑金银矿床氧同位素组成特征及矿床成因讨论  

Composition of Oxygen Isotopes and Discussion on the Formation of Changkeng Au-Ag Deposit,Guangdong Province

作　　者：庄文明[1] 陈国能[1] 林小明[1] 彭卓伦[1] 马浩明[1] 

机构地区：[1]中山大学地球科学系,广州510275

出　　处：《吉林大学学报（地球科学版）》2006年第4期521-526,共6页Journal of Jilin University：Earth Science Edition

基　　金：高等学校博士点专项科研基金项目(2001024411706;20030558005)

摘　　要：通过对长坑金银矿床16线部分钻孔进行较系统的氧同位素分析,发现岩石的δ18O值有自矿体下部(银矿体)向浅部(金矿体)、自矿体中心向围岩逐渐增大的趋势。全岩δ18O值的这种变化,与围岩蚀变强度减弱的方向一致。据此以及本区成矿元素的分带特征,结合近年提出的花岗岩原地重熔说所阐明的成矿元素分带规律,提出长坑金银矿床应为岩浆热液矿床、成矿热液流体应来自深部隐伏花岗岩的见解,并指出在银矿体的下部有寻找铅锌铜矿床的可能性。Oxygen isotope analyses of the samples collected systemically from six bores of the 16th prospecting line of Changkeng gold-silver deposit indicate that the δ^18 O values of rock increase from the deeper silver ore body to the shallower gold ore body and from the center of ore body to the wall rock, which consistent with the decreasing of alteration intensity of the wall rocks. Combining with the zoning characteristics of the ore-forming elements clarified by the in-situ melting hypothesis of granite formation in recent years, it is suggested that the Changkeng deposit should be a hydrothermal deposit, the hydrothermal fluids likely came from the concealed granite in the southern part of the region, and it is possible to find out lead, zinc and copper deposits below the silver ore body.

关 键 词：长坑金银矿床 氧同位素 围岩蚀变 成矿流体 花岗岩原地重熔模型 

分 类 号：P618.51[天文地球—矿床学]