摘要
钨锑砷金矿床主要赋存于元古界线变质岩系之韧性剪切断裂带内,受地层层位和构造控制。 金为自然金,主要呈显微和次显微粒状,以机械混入物或微包体赋存于硫(砷)矿物裂隙、晶隙间和晶面上。 成矿作用是在晚元古代火山—碎屑沉积矿源层的基础上,经变质溶液,在中低温偏低盐度和中偏弱酸性条件下完成的。属火山沉积—变质热液型矿床,主要成矿期为加里东早期。 安化-溆浦-洪江深大断裂两侧的元古代地层中韧性变形带是主要找矿对象。
W-Sb-As-Au ore deposits are mainly occurred in tenacity shear structural zone of low grade metamorphic rocks of Proterozoic Erathem, and are controlleb by stratigraphy hor-rizon and structures.
It is native gold, and is mainly occurred as micro to submicron granular one, and occurred in the fracture, crystal crevasse and on crystal face of sulfur (Arsenic) minerals as mechanical mixture or microinclusion.
On the basis of deposition in late Proterozoic volcanic-clastic ore source bed mineral-zation was accomplished at the condition of medium-low temperature, lower salinity and in intermediate-weak acidio metamorphic solution. It is belonged to volcanic deposition-metamorphic hydrothermal type. The major minerogenetic epoch is in early stage of Caledonian Period.
Major exploratory target is the tenacity deformation zone in Proterozoec strata on both sides of the Anhua-Xufu-Hongjiang deep fracture zone.
出处
《矿产与地质》
1990年第3期18-25,共8页
Mineral Resources and Geology
