安徽西湾铅锌矿含矿层位顶部原生晕特征

doi:10.11720/wtyht.2022.1406

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摘要

安徽西湾铅锌矿位于庐枞火山岩盆地北缘,该区属于第四系覆盖区,勘查难度大。本文利用钻孔岩心样的分析结果,对西湾铅锌矿的原生晕特征进行研究,发现矿化带及其顶、底板的元素含量及异常特征差异明显:矿化带赋存的角砾状灰岩中Pb、Zn、Ag、As、Sb、Bi、Au、Cu、Mo等含量高,异常强度及规模大,具清晰的浓度和组分分带,异常不仅很好地反映了矿体特征,对矿体呈NE向延伸的趋势指示明显;而矿化带顶板的火山岩中As、Sb、Pb、Zn、Ag等含量较高,有较弱的异常,异常无明显的分带特征,仅对采样点附近矿体有一定的指示;底板的硬石膏上述元素含量低,无明显的异常显示。本区As、Sb、Pb、Zn、Ag、Mo为铅锌矿化的指示元素。采集于不同成矿部位的岩心样的元素含量及其异常特征,可以指导矿区的进一步找矿。

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	程培生
	汪曙潮
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	顾大年
	张建明
	杜东旭

关键词 ：覆盖区, 铅锌矿, 原生晕, 庐枞盆地

Abstract：

The Xiwan lead-zinc deposit in Anhui Province is located on the northern margin of the Luzong volcanic basin. This deposit is an overburden area, causing great difficulties with exploration. Based on the analysis results of borehole core samples, this study analyzed the characteristics of the primary halos of the Xiwan lead-zinc deposit. The results show that the mineralized zone and its roof and floor have significantly different contents and anomaly characteristics of elements. Specifically, brecciated limestones in the mineralized zone have high contents of elements such as Pb, Zn, Ag, As, Sb, Bi, Au, Cu, and Mo. These elements feature high anomaly intensity and large anomaly scales and have definite concentrations and component zoning. These element anomalies effectively reflect the characteristics of orebodies and significantly indicate the NE-trending extension of ore bodies. The volcanic rocks on the roof of the mineralized zone have high contents of elements such as As, Sb, Pb, Zn, and Ag. These elements feature weak anomalies without significant zoning. These element anomalies can only indicate the ore bodies near the sampling points. The anhydrites on the floor have low contents of the abovementioned elements, without significant anomaly. Therefore, As, Sb, Pb, Zn, Ag, and Mo are indicator elements of lead-zinc mineralization in the study area. The brecciated limestones in the mineralized zone have high element contents, forming anomalies with high intensity and large scales. Moreover, these anomalies are characterized by significant concentrations and component zoning and can clearly indicate the extension direction of ore bodies. The contents and anomaly characteristics of elements in the core samples collected from different metallogenic parts can guide the further prospecting of the mining area.

Key words： overburden area lead-zinc deposit primary halo Luzong volcanic basin

收稿日期: 2021-07-22 修回日期: 2022-06-17 出版日期: 2022-12-20

ZTFLH:

P632

基金资助:东华理工大学核资源与环境国家重点实验室开放基金项目(NRE1903);安徽省地质勘查基金项目(2012-1-4);安徽省地质勘查基金项目(2015-2-4);安徽省地质勘查基金项目(2018-1-Ⅰ)

作者简介: 程培生(1966-),男,工程硕士,教授级高级工程师,长期从事地球化学、矿产勘查工作。

引用本文:

程培生, 汪曙潮, 李壮, 顾大年, 张建明, 杜东旭. 安徽西湾铅锌矿含矿层位顶部原生晕特征[J]. 物探与化探, 2022, 46(6): 1381-1387.
CHENG Pei-Sheng, WANG Shu-Chao, LI Zhuang, GU Da-Nian, ZHANG Jian-Ming, DU Dong-Xu. Primary halo characteristics on the top of the ore-bearing horizon in the Xiwan lead-zinc deposit in Anhui Province. Geophysical and Geochemical Exploration, 2022, 46(6): 1381-1387.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2022.1406 或 https://www.wutanyuhuatan.com/CN/Y2022/V46/I6/1381

Fig.1 西湾矿区基岩地质简图
1—白垩系下统龙门院组;2—侏罗系下统磨山组;3—三叠系上统拉犁尖组;4—三叠系中统铜头尖组;5—三叠系中统东马鞍山组;6—三叠系下统南陵湖组;7—粗安斑岩;8—闪长岩;9—推测地质界线;10—推测断层;11—矿体水平投影范围;12—研究区范围;13—勘探线

Fig.2 西湾铅锌矿20线地质剖面

Fig.3 西湾铅锌矿纵Ⅱ线地质剖面

Table 1 西湾矿区主要岩性元素含量统计

Fig.4 西湾铅锌矿光谱样元素聚类分析谱系

Table 2 异常下限及分带值

Fig.5 首个火山岩样元素异常

Fig.6 首个灰岩样元素异常

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