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物探与化探  2022, Vol. 46 Issue (4): 798-807    DOI: 10.11720/wtyht.2022.1444
  地质调查·资源勘查 本期目录 | 过刊浏览 | 高级检索 |
原生晕中元素及元素组合空间变化性研究——以青海省扎家同哪金矿为例
侯振广1(), 袁兆宪2()
1.青海省第五地质勘查院,青海 西宁 810008
2.河北地质大学 资源与环境工程研究所,河北 石家庄 050031
The spatial variations of elements and element associations in the primary geochemical halos:A case study of the Zhajiatongna gold deposit in Qinghai province
HOU Zhen-Guang1(), YUAN Zhao-Xian2()
1. No. 5 Exploration Institute of Geology and Mineral Resources, Qinghai Bureau of Geological Exploration and Mineral Development, Xining 810008, China
2. Institute of Resource and Environmental Engineering, Hebei GEO University, Shijiazhuang 050031, China
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摘要 

原生晕普遍存在于各种矿床尤其是热液矿床中,是深部找矿必不可少的地球化学标志。目前对于原生晕中元素的富集贫化及组分分带研究较多,而对于元素及组合元素的空间变化性关注较少。本文基于青海省扎家同哪金矿2 279个钻孔原生晕样品地球化学数据,拟使用元素富集系数计算和多元统计分析的方法,研究矿床不同空间位置的元素和元素组合的变化特征。结果显示,从围岩样品、矿化围岩样品、矿石样品和全体样品中都提取出了代表围岩组分和矿化组分的元素组合,反映了矿床形成过程的本质是矿化组分叠加于围岩组分。在矿石样品中,还提取出了中高温元素组合和中低温元素组合,而在矿化围岩样品中,提取出了高温成矿元素组合和中低温成矿元素组合,反映了矿质沉淀机制以及沉淀时间和空间的差异。研究揭示,在扎家同哪金矿原生晕中,从外围向矿化中心,从定量的角度,成矿相关元素总体上表现为富集程度递增及富集元素数量增多的趋势,而从定性的角度,表现为围岩—矿化元素组合叠加中高温—中低温和高温—中低温成矿元素组合。

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侯振广
袁兆宪
关键词 原生晕富集系数因子分析元素组合扎家同哪金矿    
Abstract

The primary geochemical halos, which exist in nearly all types of deposits, especially in hydrothermal deposits, serve as an essential geochemical indicator for deep prospecting. Many studies have been presently carried out on the elemental enrichment/depletion and component zoning in primary geochemical halos. However, there is a lack of reports on the spatial variations of elements and associated elements. This study collected geochemical data from 2,279 samples of the boreholes in the Zhajiatongna gold deposit and then calculated the enrichment factors and conducted a multivariate analysis to characterize the spatial variations of elements and element associations of the deposit. The element associations representing the components of surrounding rocks and mineralized components were extracted from all samples including surrounding rock samples, mineralized surrounding rock samples, and ore samples. They reflect that the deposit was formed by the superposition of mineralized components on the components of surrounding rocks in essence. Moreover, high-medium- and medium-low-temperature element associations were extracted from the ore samples, and high- and medium-low-temperature metallogenic element associations were extracted from the mineralized surrounding rock samples, indicating mineral precipitation mechanisms and the differences in the precipitation time and space. As suggested by the results, the primary geochemical halos of the Zhajiatongna deposit show the following variations from the periphery to the mineralization center: the mineralization-related elements generally exhibit an increasing trend in terms of enrichment degree and the number of enriched element types quantitatively, and the high-medium-temperature-medium-low-temperature and high-temperature-medium-low-temperature metallogenic element associations are superimposed on the surrounding rocks - mineralized element associations.

Key wordsprimary geochemical halo    enrichment factor    factor analysis    element association    Zhajiatongna gold deposit
收稿日期: 2021-08-12      出版日期: 2022-08-17
ZTFLH:  P  
基金资助:国家重点研发计划项目(2021YFC2900100);国家自然科学基金项目(41602338);河北省自然基金项目(D2021403050)
通讯作者: 袁兆宪
作者简介: 侯振广(1985-),男,工程师,主要从事矿产勘查研究工作。Email: up.hzg@126.com
引用本文:   
侯振广, 袁兆宪. 原生晕中元素及元素组合空间变化性研究——以青海省扎家同哪金矿为例[J]. 物探与化探, 2022, 46(4): 798-807.
HOU Zhen-Guang, YUAN Zhao-Xian. The spatial variations of elements and element associations in the primary geochemical halos:A case study of the Zhajiatongna gold deposit in Qinghai province. Geophysical and Geochemical Exploration, 2022, 46(4): 798-807.
链接本文:  
https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2022.1444      或      https://www.wutanyuhuatan.com/CN/Y2022/V46/I4/798
Fig.1  扎家同哪金矿11号勘探线剖面
元素 Ag As Au Cu Hg Mo Pb Sb Sn W Zn
方法 ES AF ICP-MS ICP-MS AF ICP-MS ICP-MS AF ES ICP-MS ICP-MS
检出限 20 0.33 0.25 1 0.5 0.15 0.85 0.046 0.85 0.3 4
Table 1  各元素使用的检测方法和检出限
围岩 矿化围岩 矿石
粉砂质板岩 含黄铁矿化粉砂质板岩、含黄铁矿化碎裂岩化粉砂质板岩、含黄铁矿化毒砂矿化粉砂质板岩 金矿石
泥质板岩 含黄铁矿化泥质板岩、含黄铁矿化碎裂岩化泥质板岩、含黄铁矿化毒砂矿化泥质板岩
长石砂岩 含黄铁矿化长石砂岩、含黄铁矿化碎裂岩化长石砂岩、含黄铁矿化毒砂矿化长石砂岩、含黄铁矿化毒砂矿化碎裂岩化长石砂岩
Table 2  扎家同哪矿床原生晕样品主要岩性
Fig.2  矿化围岩和矿石相对于围岩的元素富集趋势
元素 全体数据 围岩数据 矿化围岩数据 矿石数据
F1 F2 F1 F2 F1 F2 F1 F2
As 0.86 -0.06 -0.11 0.86 -0.84 0.38 0.79 -0.33
Au 0.78 -0.07 -0.11 0.81 -0.84 0.07 0.84 -0.10
Cu -0.06 0.74 0.75 0.01 0.90 0.15 -0.20 0.55
Hg 0.49 0.33 0.38 0.30 0.79 0.43 0.20 0.67
Mo 0.05 0.20 0.21 0.12 -0.02 -0.71
Pb 0.08 0.43 0.59 0.00 0.66 0.46 -0.31 0.39
Sb 0.56 0.10 0.09 0.43 0.21 0.88 -0.01 0.69
Sn -0.09 0.67 0.65 -0.02 0.66 -0.54 -0.46 -0.11
W 0.42 -0.02 0.26 0.68 -0.48 -0.11 0.83 -0.01
Zn 0.01 0.81 0.80 -0.01 0.90 0.27 -0.04 0.69
Table 3  不同位置数据因子分析前两个最大因子中的元素载荷
Fig.3  前两个最大因子的因子载荷
Fig.4  扎家同哪金矿原生晕中元素和元素组合空间分带示意
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