Geological and Geochemical Characteristics of the Hydrothermal Sediments in the Baguamiao Gold Deposit

The genesis of the Baguamiao gold deposit is noticeable. The author suggests that the banded rocks in the ore beds are of hydrothermal origin. This series of rocks occur along the strata, consisting mainly of interbeds of quartz-rich laminae, albite-quartz laminae and iron-rich carbonate laminae, which form a banded structure with sedimentary rhythms and sedimentary cycles. The banded rocks have gradually changed into phyllite or slate, which show characteristics of a hydrothermal sediment basin locally depressed. The chemical composition and microelement characteristics of the banded rocks are similar to those of siliceous, sodic and iron-carbonaceous hydrothermal sedimentary rocks in the Devonian lead-zinc deposits in the Qinling region. The hydrothermal sedimentary rocks are closely related to gold mineralization in space, which indicates that the Baguamiao gold deposit belongs to the hot water sedimentation (transformation) type. A correct understanding of the genetic type of the deposit is most helpful for ore prospecting in the region.