利比里亚Harper地区水系沉积物地球化学特征及找矿方向

doi:10.11720/wtyht.2024.1128

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Abstract

Birimian rocks, the most significant Au ore-forming rocks in western Africa, are widespread in Harper, southeastern Liberia. As indicated by the geochemical parameters from the 1∶250 000 stream sediment survey of this region, elements Au and Hg exhibit high enrichment and high differentiation while element As manifests enrichment and high differentiation. These findings suggest considerable potential for Au prospecting. Based on the correlation analysis of elements, this study selected factors F1 (for the Au-Hg-Pb-Sn association) and F2 (for the As-Sb-W association) to effectively guide the exploration of gold deposits. Thirteen composite anomalies were delineated by extracting the anomaly information of Au, Hg, As, and Sb from the two principal factors, effectively reflecting the anomaly distributions of different gold deposits or ore occurrences. The geological and mineral surveys in anomaly areas reveal that areas HS1-HS3 and HS12-HS13 with composite anomalies characterized by directional distribution and high intensities show distinct Au mineralization information. Based on this, two major Au prospects, i.e., Seethum New and Behwan, have been identified for further detailed exploration.

Key words： gold deposit stream sediment anomaly extraction metallogenic prospect area Liberia

Received: 20 March 2023 Published: 16 April 2024

ZTFLH:

P632

Corresponding Authors: CHEN Kai-Xu E-mail: 493652968@qq.com;178372237@qq.com

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	Articles by authors
	Yang BAI
	Kai-Xu CHEN
	Chong CHEN
	Fu-Lin LI
	Ji-Chun ZHANG
	Ling-Xiao WEI
	Ke-Fu SI
	Xiong-Wei ZHENG
	Yun-Fei HU
	Ying WU
	Yuan-Pei ZHANG

Cite this article:

Yang BAI,Kai-Xu CHEN,Chong CHEN, et al. Stream sediment geochemistry and prospecting targets in Harper, Liberia[J]. Geophysical and Geochemical Exploration, 2024, 48(2): 382-392.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1128 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I2/382

1](a) and distribution of sampling points (b) in the study area
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Geotectonic location^[1](a) and distribution of sampling points (b) in the study area

Elemental analysis methods and detection limit

Statistical characteristics of elements geochemical values

Pedigree diagram for R-type cluster analysis of all elements(range 0 to 1 standardize, centroid clustering cluster method, Pearson correlation interval)

Characteristic parameters of factor analysis

Values for lower limit and concentration zoning of single element anomaly

The distribution of Au-As-Sb-Hg composite anomaly and metallogenic prospecting area in the study area

The profile maps of HS1-HS3 composite anomaly
a—geology map;b—Au anomaly;c—Hg anomaly

The geology and mineralization occurrence in anomaly area

The profile maps of HS5-HS6 composite anomaly
a—geology map, b—Au anomaly;c—Hg anomaly;d—As anomaly

The profile maps of HS12-HS13 composite anomaly
a—geology map;b—Au anomaly;c—As anomaly;d—Sb anomaly

The geology and mineralization occurrence in HS12-HS13 anomaly area

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