摘要
安徽铜陵天马山金硫矿床发育上部层状矿体和下部网脉状矿体,地球化学特征呈现出明显的垂向变化和二元结构性。从下部网脉状矿化岩石到上部层状矿石,Pb、Zn、Au、Ag、As、Hg等含量和δ18O值总体逐渐增高,Cu、Mo、Cr、Co、Ni、REE等含量和成矿温度499℃→65℃及δ34S值总体呈逐渐降低趋势。黄铁矿的δ34S值为+4.0‰~+9.6‰,上部层状块状矿石中方解石和石英的δ18O平均值为+13.7‰,下部网脉状矿化岩矿石中脉石英或全岩δ18O平均值为+12.3‰。地质地球化学特征反映天马山金硫矿床为海底热水喷流沉积成因。
The Tianmashan Au-S deposit is geochemically characterized by a vertical variation and a "two-member texture" as well as the development of the upper stratiform ore bodies and the lower disseminated-veinlet mineralized rocks(ores).Pb,Zn,Au,Ag,As,Hg content and average δ18O values increase progressively whereas Cu,Mo,Cr,Co,Ni,REE content,measured temperatures(from 499℃ to 65℃) of fluid inclusions and δ34S decrease gradually from the lower disseminated-veinlet mineralized rocks(ores) to the upper stratiform ore bodies.δ34S values of pyrite range from +4.0‰ to +9.6‰.The average δ18O value of calcite and quartz in the upper stratiform ore body is +13.7‰,while that of quartz and whole rock in the lower disseminated-veinlet mineralized rocks(ores) is +12.3‰.These geological-geochemical characteristics suggest that the Tianmashan Au-S deposit is of the submarine sedimentary exhalative origin.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2010年第2期203-208,共6页
Acta Geoscientica Sinica
基金
国土资源部科技专项研究项目(编号:B0002-3)资助
关键词
金硫矿床
二元结构
地质地球化学
安徽天马山
Au-S deposit
two-member texture
geology-geochemistry
Tianmashan in Anhui