干旱区生态环境知识资源中心(Arid): Secondary minerals in a calcareous environment: an example from Um Gheig Pb/Zn mine site, Eastern Desert, Egypt

Arid

DOI	10.1007/s12665-021-09590-x
	Secondary minerals in a calcareous environment: an example from Um Gheig Pb/Zn mine site, Eastern Desert, Egypt
	Redwan, Mostafa; Rammlmair, Dieter; Berkh, Khulan
通讯作者	Redwan, M (corresponding author), Sohag Univ, Geol Dept, Fac Sci, Sohag 82524, Egypt.
来源期刊	ENVIRONMENTAL EARTH SCIENCES
ISSN	1866-6280
EISSN	1866-6299
出版年	2021
卷号	80 期号:7
英文摘要	Alteration of abandoned mine sites and wastes generates variable secondary mineral phases that incorporate different toxic trace elements with a prospective threat to the neighboring ecosystems. The main focus of this study was to investigate the mineralogical and geochemical changes at neutral pH where dry condition prevails around oxidation-primary contacts interface and the surface in Um Gheig Pb/Zn mine, Eastern Desert, Egypt. The secondary minerals were determined by M4 Tornado mu -EDXRF, Raman microscope and scanning electron microscopy with energy-dispersive system. Two alteration zones were recognized depending on ion availability and the Eh/pH conditions. The first include anglesite as an initial phase that quickly transformed into a more stable cerussite and hydrocerussite. Mendipite formation was controlled by the availability of Cl- ions in the solution. Hemimorphite was formed after sphalerite in the pore spaces, depending on the accessibility of Si ions from silicates dissolution. Iron (oxy) hydroxides were formed in a later stage due to their restricted mobility in carbonates. The second zone includes gypsum and anhydrite formed at the surface of the mine wastes due to continuous evaporation in arid environments. These secondary mineral phases can undergo different mineral transformations depending on the prevailing conditions. The element release ratios in the mine surface zone compared to the capillary fringe zone reached 12.1, 2.8, 1.6, 0.17, 0.09 and 0.03 for Sr, Cr, Pb, Zn, Cu, and Ni in the mine surface zone compared to 5.86, 0.01, 0.05, 0.02, 0.07 and 0.01 in the capillary fringe zone. The findings from this investigation have important implications for the management and the control of elements mobility from secondary phases formed in mined areas.
英文关键词	Mine wastes Secondary minerals Arid environments Pb Zn mine Eastern Desert Egypt
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000634925700007
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350108
作者单位	[Redwan, Mostafa] Sohag Univ, Geol Dept, Fac Sci, Sohag 82524, Egypt; [Rammlmair, Dieter; Berkh, Khulan] BGR Hannover, Stilleweg 2, D-30655 Hannover, Germany
推荐引用方式 GB/T 7714	Redwan, Mostafa,Rammlmair, Dieter,Berkh, Khulan. Secondary minerals in a calcareous environment: an example from Um Gheig Pb/Zn mine site, Eastern Desert, Egypt[J],2021,80(7).
APA	Redwan, Mostafa,Rammlmair, Dieter,&Berkh, Khulan.(2021).Secondary minerals in a calcareous environment: an example from Um Gheig Pb/Zn mine site, Eastern Desert, Egypt.ENVIRONMENTAL EARTH SCIENCES,80(7).
MLA	Redwan, Mostafa,et al."Secondary minerals in a calcareous environment: an example from Um Gheig Pb/Zn mine site, Eastern Desert, Egypt".ENVIRONMENTAL EARTH SCIENCES 80.7(2021).