中国地质2011，Vol.38Issue(3)：701-715,15.
南秦岭金龙山金矿床中砷的赋存特征及其对金沉淀的影响
Mode of occurrence of arsenic and its influence on the precipitation of gold in the Jinlongshan gold deposit, southern Qinling
摘要
Abstract
Located in Zhen'an-Xunyang basin of southern Qinling Mountains, the Jinlongshan gold deposit is a superlarge Carlin-type disseminated gold deposit discovered in the 1980's.The ore deposit occurs in Upper Devonian and Lower Carboniferous clastic and carbonate strata composed of calcareous siltstone, silty shale, silty limestone and argillaceous limestone intercalated with flyschoid formation.Ore bodies are strictly controlled by fault zones.Ores were examined by such means as optical microscope, electron microprobe analyzer (EMPA) and X-ray surface scanning for the purpose of probing into the content and distribution of Fe, As and S in arsenian pyrite and arsenopyrite in primary ore samples from the Jinlongshan ore deposit.The results show that As of low content is likely to be concentrated in pyrite, and As in pyrite is stable.When the As content is higher than ～6 wt％, two-phase mixtures of pyrite and arsenopyrite are stable.The dissolution of ferruginous limestone in the host rocks, the sulfidation of the dissolved iron by H2S , and the exsolution of partial metastable auriferous arsenian pyrite may provide favorable conditions for gold precipitation in the Jinlongshan gold deposit.关键词
金矿床/地质特征/砷的赋存形式/金沉淀/金龙山Key words
gold deposit/ geological characteristics/ arsenic occurrence/ gold precipitation/ Jinlongshan分类
天文与地球科学引用本文复制引用
杨永春,刘家军,刘新会,吴胜华..南秦岭金龙山金矿床中砷的赋存特征及其对金沉淀的影响[J].中国地质,2011,38(3):701-715,15.基金项目
国家自然科学重点基金(41030423)、国家自然科学基金(40973035、40773036)、教育部长江学者和创新团队发展计划(IRT0755)、高等学校学科创新引智计划(B07011)和中国地质大学(北京)地球科学与资源学院本科生优秀论文资助计划资助. （41030423）
