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

doi:10.11720/wtyht.2022.1444

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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 words： primary geochemical halo enrichment factor factor analysis element association Zhajiatongna gold deposit

Received: 12 August 2021 Published: 17 August 2022

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Corresponding Authors: YUAN Zhao-Xian E-mail: up.hzg@126.com;sdyzx86@126.com

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	Zhen-Guang HOU
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Cite this article:

Zhen-Guang HOU,Zhao-Xian YUAN. The spatial variations of elements and element associations in the primary geochemical halos:A case study of the Zhajiatongna gold deposit in Qinghai province[J]. Geophysical and Geochemical Exploration, 2022, 46(4): 798-807.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1444 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I4/798

Sketches of gold orebodies and wall rocks in the profile of No.11 prospecting line

Analyticalmethods and the limits of detection for the elements

Lithological classification of the primary halo samples from the Zhajiatongna deposit

Variationsin elemental enrichment factor of mineralized wall rock and ore relative to unmineralized wall rock

Loadings of elements in the two biggest factors of the four sets of data

The loading plots of the two biggest factors of the four sets of data

Sketch map of zonation of elements and element associations in the primary halo of the Zhajiatongna deposit

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