Arid
DOI10.1016/j.jafrearsci.2017.10.007
Garnierite-bearing serpentinite from the Central Eastern Desert of Egypt: A signature of paleo-weathering in the Arabian Nubian Shield?
Hamdy, Mohamed M.1; El Dien, Hamed Gamal1,2; Abd El-Wahed, Mohamed A.1; Morishita, Tomoaki2
通讯作者Hamdy, Mohamed M.
来源期刊JOURNAL OF AFRICAN EARTH SCIENCES
ISSN1464-343X
EISSN1879-1956
出版年2018
卷号146页码:95-117
英文摘要

This paper records the garnierite in Wadi Dubur Neoproterozoic serpentinites from the Central Eastern Desert of Egypt. Garnierite (Ni-Mg hydrous silicates) occurs in two types (Type 1 and Type II) of infillings in the weathered serpentinite that was displaced sinisterly by NNW-SSE trending strike-slip faulting and dextrally with NE-trending shearing. All recognized garnierites are serpentine-like (nepouite/pecoraite) existing in mixtures with the hosting serpentines. The Type I garnierite is Fe-richer [Mg0.25-0.71 Ni1.22-1.79 Fe1.28-3.05 Al (0.0-0.02) Sil(1.11-L73) O-5(OH)(4)] showing zoning in a collomorph texture, while the Type II garnierite is homogenous with more Si and Mg [Mg0.54-0.94 Ni1.38-2.04 Fe0.38-1.20 Al (0.0-0.01) Si1.66-2.10 O-5(OH)(4)]. Raman spectra indicate that the substitution of Ni for Fe formed a poorly crystalline goethite. The serpentinization of the Dubur peridotite protolith and the associated alteration of chromite and Ni-sulfides were important for the early individualization of Ni. It is proposed that the unweathered serpentinites represent the bedrock, while the altered garnierite-bearing ones represent the saprock. The early weathering of serpentinites contemporaneous with a faulting activation caused in situ precipitation of Ni and Fe in veins (Type 1 garnierite). With the faulting repetition and progressive alteration maintenance Ni, Si and Mg were transferred to the percolating meteoric solutions, and moved downward through the weathering profile precipitating the Type II garnierite in gouges. Although the studied Ni-rich rocks represent a narrow mineralogical occurrence, they are remnants of a former lateritic regolith most probably formed by tropical or sub-tropical weathering during Cretaceous at the expense of Wadi Dubur Neoproterozoic serpentinites. The formed regolith has been subsequently largely eroded, buried and recently exhumed in arid climate. (C) 2017 Elsevier Ltd. All rights reserved.


英文关键词Garnierite Wadi Dubur faulted Neoproterozoic serpentinite Mineralogy Whole-rock chemistry Phanerozoic Ni-lateritization Central Eastern Desert
类型Article
语种英语
国家Egypt ; Japan
收录类别SCI-E
WOS记录号WOS:000447568000008
WOS关键词NEW-CALEDONIA ; ULTRAMAFIC ROCKS ; NI-LATERITE ; RAMAN-SPECTROSCOPY ; WESTERN-AUSTRALIA ; ORE-DEPOSITS ; NICKEL ; MINERALOGY ; SILICATE ; GEOCHEMISTRY
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/210404
作者单位1.Tanta Univ, Geol Dept, Fac Sci, Tanta 31527, Egypt;
2.Kanazawa Univ, Sch Nat Syst, Dept Earth Sci, Kanazawa, Ishikawa 9201192, Japan
推荐引用方式
GB/T 7714
Hamdy, Mohamed M.,El Dien, Hamed Gamal,Abd El-Wahed, Mohamed A.,et al. Garnierite-bearing serpentinite from the Central Eastern Desert of Egypt: A signature of paleo-weathering in the Arabian Nubian Shield?[J],2018,146:95-117.
APA Hamdy, Mohamed M.,El Dien, Hamed Gamal,Abd El-Wahed, Mohamed A.,&Morishita, Tomoaki.(2018).Garnierite-bearing serpentinite from the Central Eastern Desert of Egypt: A signature of paleo-weathering in the Arabian Nubian Shield?.JOURNAL OF AFRICAN EARTH SCIENCES,146,95-117.
MLA Hamdy, Mohamed M.,et al."Garnierite-bearing serpentinite from the Central Eastern Desert of Egypt: A signature of paleo-weathering in the Arabian Nubian Shield?".JOURNAL OF AFRICAN EARTH SCIENCES 146(2018):95-117.
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