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《MINERAL DEPOSITS》 1994-01
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A PRELIMINARY DISCUSSION ON GEOLOGICAL CHARACTERISTICS AND GENESIS OF THE LAERMA GOLD DEPOSIT IN LUQU COUNTY,GANSU PROVINCE

Yao Zhongyou(Ndnjing Institute of Geology and Mineral Resources,Nanjing,Jiangsu Province)  
The Laerma gold deposit,discovered in 1985,occurs in Lower Cambrian carbonaceous sericite slate and carbonaceous siliceous slate and belongs to fine- dissemination type. The gold orebodies, generally irregular and assuming stra- tiform or irregular form,are strictly confined to the principal fault F_3,with the ore-bearing rocks being black rocks of the epimetamorphic formation,Gold occurs as ultramicroscopic particles in quartz,pyrite,barite and stibnite as well as small amounts of realgar,pyrrhotite and limonite,Alterations are silicifica- tion,pyritization,sericitization and carbonatization,with silicification being dominant,The ore-forming process might be divided into two epochs:hydrother- mal epoch(which can be subdivided into four stages)and supergene epoch. The ore-forming process proceeded under the following conditions:temper- ature 200~261℃;low pressure,small depth;oxygell fugacity-33~-52;Eh -0.4~-0.68V ;weakly acid ore-forming media;δ ̄(34)-25.20‰~+15.5‰(sul- fides);δ ̄(18)O+13.18‰~+16.55‰(quartz and calcite);δD-90.87‰~102.59‰(fluid inclusions).In addition,gold content of Lower Cambrian is higher than the background value of gold.All these physical-chemical parameters indicate that ore-forming materials came mainly from wall rocks. According to geological characteristics of the ore deposit,the Laerma gold deposit is believed tO be genetically of hydrothermal reformation type.
【CateGory Index】: P618.510.2
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