干旱区生态环境知识资源中心(Arid): Mineralogical and chemical characterization of supergene copper-bearing minerals: Examples from Chile and Burkina Faso

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DOI	10.1016/j.oregeorev.2021.104078
	Mineralogical and chemical characterization of supergene copper-bearing minerals: Examples from Chile and Burkina Faso
	Kahou, Zia Steven; Duchene, Stephanie; Brichau, Stephanie; Campos, Eduardo; Estrade, Guillaume; Poujol, Marc; Kathirgamar, Janogithan; Testa, Hugo; Leisen, Mathieu; Choy, Sandrine; de Parseval, Philippe; Riquelme, Rodrigo; Carretier, Sebastien
通讯作者	Kahou, ZS (corresponding author), Univ Toulouse, CNES, CNRS, UPS,IRD,Geosci Environm Toulouse GET, 14 Ave E Belin, F-31400 Toulouse, France.
来源期刊	ORE GEOLOGY REVIEWS
ISSN	0169-1368
EISSN	1872-7360
出版年	2021
卷号	133
英文摘要	Using optical microscopy, SEM, EPMA and LA-ICP-MS, we analyzed and characterized the textural features of Cenozoic supergene Cu-bearing minerals from three exotic and two in situ supergene copper mineralization from the Atacama Desert in northern Chile. In addition, we analyzed their major and rare earth elements compositions. We then compared these data to those obtained from the in situ supergene copper mineralization from the Gaoua Cu-Au porphyry district, emplaced during the Cenozoic in a different geodynamic setting in the West African craton. In both the in situ and exotic supergene copper mineralization, chrysocolla is the dominant supergene copper-bearing mineral, followed by pseudomalachite with minor amount of copper wad. Chrysocolla and pseudomalachite show distinct textural features. Chrysocolla appears either as black Mn-rich clasts or lightblue to green masses, filling the fractures and coating the non-mineralized clasts. Pseudomalachite occurs as green color bands or thin coatings filling empty spaces. All the deposits share some common features with regard to their major element and REE compositions, i.e. i) same range of chemical compositions suggesting similar conditions of formation and ii) strong Ce anomaly indicative of oxidant conditions during the crystallization of these supergene copper minerals. Our results reflect similar conditions for the formation of both supergene copper minerals in all the mining districts and lead us to propose that both areas (i.e. the Atacama Desert and southwestern Burkina Faso) underwent similar geological and climatic conditions in order to form and preserve supergene copper mineralization, i.e. exhumation of the porphyry copper deposit and weathering of the primary copper sulfides, downward and laterally moving of copper-bearing solutions to form in situ and exotic SCM and finally, arid to hyperarid climate to prevent mechanical abrasion and leaching of the newly formed supergene copper mineralization.
英文关键词	in situ and exotic supergene copper mineralization Atacama desert Gaoua Cu-Au district Black chrysocolla Chrysocolla Pseudomalachite
类型	Article
语种	英语
开放获取类型	Green Published
收录类别	SCI-E
WOS记录号	WOS:000647552700002
WOS关键词	ATACAMA DESERT ; EL-SALVADOR ; INSPIRATION MINE ; CENTRAL ANDES ; MINERALIZATION ; EVOLUTION ; DISTRICT ; DEPOSITS ; ENRICHMENT ; CHRYSOCOLLA
WOS类目	Geology ; Mineralogy ; Mining & Mineral Processing
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
来源机构	French National Research Institute for Sustainable Development ; E17
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/351241
作者单位	[Kahou, Zia Steven; Duchene, Stephanie; Brichau, Stephanie; Estrade, Guillaume; Kathirgamar, Janogithan; Testa, Hugo; Leisen, Mathieu; Choy, Sandrine; de Parseval, Philippe; Carretier, Sebastien] Univ Toulouse, CNES, CNRS, UPS,IRD,Geosci Environm Toulouse GET, 14 Ave E Belin, F-31400 Toulouse, France; [Campos, Eduardo] Univ Catolica Norte, Dept Ciencias Geol, Ave Angamos 0610, Antofagasta, Chile; [Poujol, Marc; Riquelme, Rodrigo] Univ Rennes, Geosci Rennes UMR 6118, CNRS, F-35000 Rennes, France
推荐引用方式 GB/T 7714	Kahou, Zia Steven,Duchene, Stephanie,Brichau, Stephanie,et al. Mineralogical and chemical characterization of supergene copper-bearing minerals: Examples from Chile and Burkina Faso[J]. French National Research Institute for Sustainable Development, E17,2021,133.
APA	Kahou, Zia Steven.,Duchene, Stephanie.,Brichau, Stephanie.,Campos, Eduardo.,Estrade, Guillaume.,...&Carretier, Sebastien.(2021).Mineralogical and chemical characterization of supergene copper-bearing minerals: Examples from Chile and Burkina Faso.ORE GEOLOGY REVIEWS,133.
MLA	Kahou, Zia Steven,et al."Mineralogical and chemical characterization of supergene copper-bearing minerals: Examples from Chile and Burkina Faso".ORE GEOLOGY REVIEWS 133(2021).