ISSN 1009-6248CN 61-1149/P 双月刊

主管单位:中国地质调查局

主办单位:中国地质调查局西安地质调查中心
中国地质学会

    高级检索

    东秦岭北岭金矿床黄铁矿标型特征及成矿指示意义

    Typomorphic Characteristics and Metallogenic Indicative Significance of Pyrite in Beiling Gold Deposit, East Qinling

    • 摘要: 北岭金矿床地处东秦岭熊耳山多金属矿集区,作为典型的受构造控制的蚀变岩型金矿床,其深部成矿潜力亟待深入探究。本研究聚焦于北岭金矿床 530 m 与 620 m 标高矿体中的载金矿物黄铁矿,借助野外地质调查、矿相学分析,以及对载金矿物黄铁矿的产出特征、成分标型特征和热电性特征的系统研究,深入探讨不同标高黄铁矿的成矿温度、形成深度及剥蚀率,获得如下成果与认识:①针对 530 m 与 620 m 两段标高的黄铁矿样本开展分析, Fe/(As + S)值未呈现显著差异,这一结果表明两段标高处的黄铁矿均处于矿体中深部位置,Au/Ag值显示该矿体为岩浆热液成因。②经测定,530 m 标高的黄铁矿平均形成温度为 202~291 ℃,620 m 标高的黄铁矿平均形成温度则为 219~275 ℃,两段标高的黄铁矿形成温度基本相近,指示其形成于中温环境。③ 530 m 标高的矿体剥蚀率为 53.0%~54.0%,620 m 标高的矿体剥蚀率为 53.5% ~56.8%,整体呈现出较低的剥蚀率。研究结果表明,北岭金矿床两段标高的黄铁矿样品均处于矿体中深部位置,这代表着矿体向深部存在延展空间,具备较大的深部勘查潜力。

       

      Abstract: Beiling gold deposit is located in the Xiong'ershan polymetallic ore cluster in Eastern Qinling, as a typical tectonically controlled alteration rock gold deposit, its deep metallogenic potential needs to be explored urgently. This study focused on the gold-bearing mineral pyrite in the 530 m and 620 m elevation orebodies of the F881 ore body at the Beiling Gold Deposit. With the help of field geological investigation, mineralogical analysis, and systematic study of the production characteristics, composition standard characteristics and thermoelectric characteristics of gold-bearing mineral pyrite, the metallogenic temperature, formation depth and denudation rate of pyrite at different elevations are deeply discussed, and the following results and understandings are obtained: ① Analysis of pyrite samples at 530 m and 620 m elevations shows no significant difference in ω(Fe)/ω(As+S) values, which indicates that the pyrite at the elevations of the two elevations is in the middle and deep positions of the ore body. At the same time, the ω(Au)/ω(Ag) ratio indicates that the ore body is of magmatic hydrothermal origin. ② The average formation temperature of pyrite at 530 m elevation is 202~291 ℃, and the average formation temperature of pyrite at 620 m elevation is 219~275 ℃, The formation temperature of pyrite in the two elevations is basically the same, indicating that it was formed in a mesothermal environment.③In terms of ore body denudation rates over two elevations, the ones at the 530 m elevation is from 53.0% to 54.0% and the ones at the 620 m elevation is from 53.5% to 56.8%, showing a lower denudation rate overall. Based on the above research results, the pyrite samples of the two elevations of the Beiling gold deposit are in the middle and deep positions of the ore body, which indicates that there is room for extension of the ore body to the deep part and has great potential for deep exploration.

       

    /

    返回文章
    返回