论文部分内容阅读
1 Geology CARLJN-TYPE gold deposits (CTDs) consist of extremely fine-grained gold that is generally submicron topossibly atomic in size. Most of the gold is hosted by hydrothermal arsenian pyrite and quartz, with lesseramounts present in carbonaceous matter and fine-grained phyllosilicates. In the Great Basin, the hostrocks consist primarily of Paleozoic sedimentary rocks, although few deposits are located primarily inyounger sedimentary rocks and minor mineralization also occurs in igneous rocks in some deposits.The most common host rock types are silty carbonates to calcareous siltstones and calcareous shales. Manydeposits are spatially associated with matured hydrocarbon accumulations (kerogen), but it is unclearwhether these hydrocarbons played an active or passive role in ore depositional process. There is significant structural control on the localization of ore zones in CTDs, consisting of bothfolds and faults. The general geometry of the ore zones comprises a feeder zone, commonly controlled by
Most of the gold is hosted by hydrothermal arsenian pyrite and quartz, with lesseramounts present in carbonaceous matter and fine-grained phyllosilicates The most common host rock types are silty carbonates to calcareous siltstones and calcareous There are significant structural controls on the localization of ore zones in CTDs, consisting of bothfolds and faults The general geometry of the ore zones includes a feeder zone, commo nly controlled by