摘要
文章对江南造山带中段湖南东部地区主要金矿床开展了成矿年龄测定和硫同位素分析。获得该区黄金洞和大洞金矿床矿脉石英流体包裹体Rb-Sr等时线年龄分别为152±13Ma和70±1.3Ma;同时获得黄金洞矿床矿脉硫化物δ34S均值为-6.3‰(主要集中在-4.8‰到-8.6‰之间)、大洞δ34S均值为-9.2‰(主要在-8‰到-10‰之间)、雁林寺δ34S均值为-1.2‰(主要在-2.6‰和6.1‰之间)。结合华南区域大地构造演化特征、江南造山带主要金矿床成矿地质条件,认为440～400Ma、160～110Ma和～70Ma是该区的三个主要金矿化期;含矿流体主要来源于深部,与变质水和/或岩浆水有关,但成矿晚期有大量再循环的大气降水和/或海水加入。江南造山带湖南段金矿床具有与造山作用有关的浅成型金矿的某些成矿特点。
Based on Rb-Sr isotopic dating on fluid inclusion in quartz from auriferious quartz veins in the eastern Hunan Province of Jiangnan orogenic belt, south China and on analysis of sulfur isotopic component, the Huangjingdong gold ore deposit yielded a Rb-Sr isochrone age of 152 ± 13Ma whereas an age of 70± 1.3Ma for the Dadong ore deposits. The average δ^34 S values for sulfides in quartz ore veins are - 6. 3‰ （ mainly between - 4.8‰ and - 8.6‰） for the Huangjingdong gold deposit, - 9.2‰ （malnly between - 8‰ and - 10‰） for the Dadong gold deposit and - 1.2‰ （mainly between -2.6‰ and 6.1‰） for the Yanlinsi gold deposit, respectively. In the light of the regionally tectonic evolution of South China and the previous studies on gold ore deposits in the Jiangnan orogenic belt, we conclude that our studied region mainly contained three epochs of gold mineralization, which are 440 - 400Ma, 160 - 110Ma, and - 70Ma, respectively. The ore-forming fluids had a primary derivation from deep section and were related to metamorphic water or magmatic water, but recycled meteor water or sea water were largely involved during late stages of mineralization. The gold ore deposits in Hunan region of the Jiangnan orogenic belt show some features of orogeny-related epizonal gold ore deposits.
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
2008年第4期482-491,共10页
Geotectonica et Metallogenia
基金
国家自然科学基金项目(No.40773017)资助
