| 张家口北部铅锌银多金属矿床区域剥蚀程度分析 |
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| 引用本文：李随民,焦雪红,郝花金,韩腾飞,孙志伟,李宾,李紫烨,邢欢,韩玉丑.2021.张家口北部铅锌银多金属矿床区域剥蚀程度分析[J].地球学报,42(4):537-544. |
| DOI：10.3975/cagsb.2020.082801 |
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| 基金项目:河北省自然资源厅基金项目(编号: 2011055548; 2013045650) |
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| 中文摘要:张家口北部是河北省重要的铅锌银多金属矿床富集区。区内多金属矿床成矿作用和控矿因素相似, 矿化形成均与燕山期酸性小岩体侵入变质结晶基底有关。区域多金属矿床化探异常具可对比性。化探异常图显示区内多金属矿床与化探异常在地表总体呈现无偏性空间分布特征, 化探数据因子分析结果表明成矿元素相关性在水系沉积物中未发生改变。据此可将原生晕中依据不同元素组合识别矿体剥蚀程度的思路运用于1:20万化探数据, 以此识别区域多金属矿床剥蚀程度。本文以张家口研究程度较高的蔡家营多金属矿床为例, 选用可有效识别矿体剥蚀程度的(Bi+V+Ba)/(B+Sb+U)、(U/Th)元素比值, 将区域化探数据用于多金属矿床剥蚀程度分析, 结果显示区内多金属矿床均出露于剥蚀强度较高区域, 受到不同程度的剥蚀。累加NAP值方法显示兰闫多金属矿床剥蚀程度最高, 蔡家营、青羊沟矿床剥蚀程度明显降低。区内多金属矿床多分布于岩石风化程度较高的变质结晶基底出露区域及其周边。火山岩盖层下伏变质岩中多金属矿床多呈隐伏-半隐伏状态分布, 应是区内下步多金属矿床找矿方向。 |
| 中文关键词:矿体剥蚀程度 岩石风化程度 铅锌银多金属矿床 张家口北部 |
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| An Analysis of the Denudation Degree of Pb-Zn-Ag Polymetallic Deposits in the North of Zhangjiakou Area |
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| Abstract:The northern part of Zhangjiakou area is an important area with Pb-Zn-Ag polymetallic deposits in Hebei Province. Because the mineralization process and ore-controlling factors of polymetallic deposits are similar in this area, the mineralization should be related to the Yanshanian acid small rock body that invaded the metamorphic rocks under the volcanic cover, so that the geochemical anomalies can be compared. Geochemical anomalies have overall unbiased characteristics to the position of the polymetallic ore deposit, factor analysis of geochemical surveying data shows that correlation of the ore-forming elements does not change from primary halos in stream sediments, and hence researchers can use primary halos of these elements to distinguish the denudation degree of the orebody so as to analyze regional denudation extent of the polymetallic deposit. With the Caijiayin polymetallic deposit as an example, the authors investigated the parameter of (Bi+V+Ba)/(B+Sb+U) and (U/Th) ratios which can effectively identify the denudation extent. The results of geochemical surveying data analysis indicates that the polymetallic deposits are widely distributed all over the study areas which have different degrees of denudation. The cumulative NAP method shows that the denudation degree of the Lanyan polymetallic deposit is the highest and that of Caijiaying and Qingyanggou deposit is significantly reduced. The polymetallic deposits are mostly distributed in the area of metamorphic crystal basement and its periphery where there exists high degree of rock weathering. As the weathering degree of the rocks of volcanic rock cover area is low, the polymetallic deposits which lie in the underlying metamorphic rocks are mostly distributed in the concealed to semi-concealed state, these areas should be the new targets in search for polymetallic deposits. |
| keywords:degree of denudation of deposit degree of rock weathering Pb-Zn-Ag polymetallic deposit north of Zhangjiakou |
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