摘要
剪切带型金矿可分为蚀变破碎带型及韧性剪切带型,在阿尔泰造山带的沙尔布拉克金矿带及韧性剪切带,山东三山岛-仓上金矿带及其它地区的金矿带中,金矿的形成受变形强度及方式等因素的控制,只有剪应变强度达到一定程度如产生糜棱岩,超糜棱岩时,在有物源的情况下才有可能形成金矿。剪切带中的韧性变形与变质反应为金矿质的产生,运移、沉淀与富集提供了有利的环境和场所。在韧性变形情况下金矿质可能呈微粒扩散到由变形产生的高密度品格位错等晶内、晶界的缺陷中,两种类型的金矿在空间上具分带性。另外对阿尔泰造山带中剪切带型金矿进行了预测。
A great deal of information indicate that the shear zone type of gold deposits can be divided into two types: the brittle fractured and altered zone type the ductile shear zone type. The formation of gold deposits is controlled by the strength and style of deformation and other factors in the Sharbulake gold zone and other ductile shear zones in Altaides, three mountains island—Canshang gold deposit zone of Shandong Province and gold deposit zones in other areas. Gold deposits would be formed under the condition of having gold resource, as long as the value of shear strain reaching an extent to produce mylonite and super-mylonite. The ductile deformation and metamorphic reaction in the shear zone supply a suitable environment and site for the formation, translation, deposition and richness of gold. Under the ductile deformation, the micrograin of gold can diffuse into the inner and boundary defects and dislocations of crystal of high density. Two types of gold are of zoning in space. This paper also predicts the shear zone types of gold deposits in Altaides.
出处
《大地构造与成矿学》
EI
CAS
CSCD
1991年第3期225-232,共8页
Geotectonica et Metallogenia
关键词
金矿
成因
预测
剪切带
brittle fractured and altered zone, ductile shear zone, prediction of gold deposit, Altai, Xingiang, China.
