摘要
辽宁省清原县的南龙王庙金矿,赋存于太古宙绿岩带的变粒岩岩段中。矿体受深层次绿帘角闪岩相的韧性剪切带控制,矿体附近有明显蚀变。载金矿物为黄铁矿和脉岩,金为裂隙金,成色为946。金和微量元素相关性指示矿质金源自绿岩,同位素特征反映矿质疏、铅也源自绿岩,石英包体水的氢氧同位素指示成矿溶液为变生(质)水。所以,南龙王庙金矿是我国首次发现的同韧性剪切变生热液型金矿床,成矿时代为晚太古宙。
South Longwangmiao gold deposit in Liaoning Province occurred in the meta-felsic rock unit in Liaobei Archean greenstone belt.Two different ore bodies were controlled by the deepseated ductile shear zone of epidote-amphibolite facies.There are discoverable alterations near ore bodies.Gold is mostly found in pyrite and fills fissues. The fineness of gold is 946. The correlation between rare elements and ore shows that gold was derived from the greenstone. Sulphur and lead isotopes indicate that sulphur and lead were also derived from the greenstone.Hydrogen and oxygen isotopes of inclusions in veinlike quartz show that water is of metamor-phic origin.Consequently the gold deposit is of matamorphic hydrothermal origin and is synductile shearing in Archean, which is the oldest one found in China so far.
关键词
太古宙
绿岩
韧性剪切带
金矿
Archean greenstone belt,metamorphic hydrothermal, ductile shear zone,North Liaoning Province
