小秦岭地区秦南矿区金矿床特点及成因研究
发布时间：2018-11-20 15:39
【摘要】：秦南矿区位于小秦岭金矿田的北部。本文收集了前人的研究成果,在野外地质调查及室内资料综合分析的基础上,开展了成矿地质特征、控矿因素及成矿规律的研究。基本查明了秦南矿区主要的构造、地层、岩浆活动及围岩蚀变等地质特征;查明了金矿的矿体特征、矿石特征及矿石类型等。确定了秦南金矿床形成于120Ma左右,即其形成时代为燕山晚期;确定了金、硫、铅等成矿物质均来源于地壳深部或上地幔,与太古代绿岩及燕山期构造—花岗岩浆活动有密切的联系。大致确定出矿床的控矿因素及成矿机制:小秦岭绿岩是金矿的重要矿源层;含矿构造带和石英脉内不同阶段构造活动所形成的裂隙系统控制了不同矿化阶段的金矿化;燕山期花岗岩不仅为金的成矿作用提供了热液—热动力条件,而且还提供了矿质来源;秦南矿区金矿床主要成矿阶段(Ⅱ、Ⅲ)温度变化为283~153℃,表明矿床形成的温度属中、低温,以中温为主,秦南金矿床应属中—低温岩浆期后热液脉状矿床成因类型。
[Abstract]:Qinnan mining area is located in the north of Xiaoqinling gold ore field. On the basis of field geological survey and comprehensive analysis of indoor data, this paper has studied the geological characteristics, ore-controlling factors and metallogenic regularity of ore deposits. The main geological features, such as structure, strata, magmatic activity and wall rock alteration, are basically found out, and the orebody characteristics, ore characteristics and ore types of gold deposits are also found out. It is determined that the gold deposit was formed in 120Ma, that is, the late Yanshanian gold deposit was formed in the late Yanshanian period. It is determined that gold, sulfur and lead are derived from the deep crust or upper mantle and are closely related to Archean greenstone and Yanshanian tectonic-granite magma. The ore-controlling factors and metallogenic mechanism of the deposit are roughly determined: the Xiaoqinling greenstone is an important source bed of gold deposits, and the fracture system formed by the tectonic activity in different stages of the ore-bearing structural belt and quartz vein controls the gold mineralization in different mineralization stages; Yanshanian granites not only provide hydrothermal and thermodynamic conditions for gold mineralization, but also provide the source of mineral material. The main metallogenic stages (鈪，
本文编号：2345296
[Abstract]:Qinnan mining area is located in the north of Xiaoqinling gold ore field. On the basis of field geological survey and comprehensive analysis of indoor data, this paper has studied the geological characteristics, ore-controlling factors and metallogenic regularity of ore deposits. The main geological features, such as structure, strata, magmatic activity and wall rock alteration, are basically found out, and the orebody characteristics, ore characteristics and ore types of gold deposits are also found out. It is determined that the gold deposit was formed in 120Ma, that is, the late Yanshanian gold deposit was formed in the late Yanshanian period. It is determined that gold, sulfur and lead are derived from the deep crust or upper mantle and are closely related to Archean greenstone and Yanshanian tectonic-granite magma. The ore-controlling factors and metallogenic mechanism of the deposit are roughly determined: the Xiaoqinling greenstone is an important source bed of gold deposits, and the fracture system formed by the tectonic activity in different stages of the ore-bearing structural belt and quartz vein controls the gold mineralization in different mineralization stages; Yanshanian granites not only provide hydrothermal and thermodynamic conditions for gold mineralization, but also provide the source of mineral material. The main metallogenic stages (鈪，
本文编号：2345296
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