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宝山铜钼多金属矿田矿化分带和蚀变组合特征
引用本文:李荣清.宝山铜钼多金属矿田矿化分带和蚀变组合特征[J].湖南地质,1990(2).
作者姓名:李荣清
作者单位:湖南省地质研究所
摘    要:宝山多金属矿田的矿化产于下石炭统石磴子组灰岩中。以宝岭倒转背斜轴为核心,矿田中部是由矽卡岩型铜钼矿床红组成的铜钼矿带,向外是由多个铅锌银矿床组成的铅锌跟矿带。笔者通过铜钼矿石和东部铅锌银矿石的化学成分,矿物组合及黄铁矿、黝铜矿的标型特征,探讨了宝山多金属矿田的矿化及蚀变组合分分带,并以此作为同类型矿床的找矿标志。

关 键 词:矿化分带  蚀变组合  蚀变分带  铜钼多金属矿田  宝山

THE MINERALIZATION ZONING AND THE ALTERATION ASSEMBLAGES IN BAOSHAN Cu-Mo POLYMETALLIC ORE FIELD
Li Rongqing Hunan Institute of Geology.THE MINERALIZATION ZONING AND THE ALTERATION ASSEMBLAGES IN BAOSHAN Cu-Mo POLYMETALLIC ORE FIELD[J].Hunan Geology,1990(2).
Authors:Li Rongqing Hunan Institute of Geology
Institution:Li Rongqing Hunan Institute of Geology
Abstract:Baoshan Cu-Mo-Pb-Zn-Ag polymetallic ore field is located in Guiyang county, southern Hunan. The mineralization occurs in the limestone of Shidenzi Formation of lower Carboniferous Series. The Cu-Mo zone, composed of skarn Cu-Mo deposits, controlled by Baolin overturned auticline, is the centre of Baoshan ore field,Out- side the Cu-Mo zone is the Pb-Zn-Ag zone which is composed of three Pb-Zn-Ag deposits. The main characteristics of the mineralization and alteration in Cu-Mo deposit and Pb-Zn-Ag deposit are as follow: The Cu-Mo ore is mainly composed of high temperature hydrothermal minerals, such as chalcopyrite, molybdenite, scheelite and bismuthinite etc., rich in Si, Al, Fe, Cu, Mo, W, Bi; the wall rock alteration is characterized by large-scale skarnization accompanied by marblization and recrystalization of limestone. The Pb-Zn-Ag ore is mainly composed of middle-lower temperature hydrothermal minerals, such as galena, sphalerite and freibergite etc., rich in Cu, Pb, Zn, Ag, etc.; the wall rock alteration is mainly recrystalization of limestone and MnMg calcitization in the limestone near orebody. From Cu-Mo deposit to the Eastern Pb-Zn-Ag deposit, the main crystal form of pyrite changes from cube to pentagonal dodecahedron and the combination of cube and octahedron, the Co and Ni content and the Co/Ni ratio of pyrite decreases gradually, while the Ag, Au and As content increases. The thermal electromotance values of pyrite are mainly negative in Cu-Mo deposits, but they are predominantly positive in the Eastern Pb-Zn-Ag deposits. The As content of tetrahedrite decreases while the Ag content increases from Cu-Mo deposit to the Eastern Pb-Zn-Ag deposits. The mineralization and alteration zoning in Baoshan orefield can be used as an indicator for the exploration of similar deposits.
Keywords:Mineralization zoning  Alteration assemblages  Alteration zoning  Cu-Mo polymetallic ore field  Baoshan
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