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Not all Neoproterozoic iron formations are glaciogenic: Sturtian-aged non-Rapitan exhalative iron formations from the Arabian-Nubian Shield
Abd El-Rahman, Yasser1,2; Gutzmer, Jens3,4; Li, Xian-Hua1,5; Seifert, Thomas3; Li, Chao-Feng1; Ling, Xiao-Xiao1; Li, Jiao1
2020-03-01
Source PublicationMINERALIUM DEPOSITA
ISSN0026-4598
Volume55Issue:3Pages:577-596
AbstractNeoproterozoic iron formations are exposed in the Wadi Hamama area (Egypt) in the northwestern part of the Arabian-Nubian Shield. Mafic and felsic volcanic and volcaniclastic rocks of an intra-oceanic island-arc setting host multiple, thin iron-formation units. Major element compositions of the iron formation confirm a low detrital input, whereas the rare-earth elements and Y data suggest deposition related to an influx of low-temperature hydrothermal fluids. Unlike most Neoproterozoic banded iron formations, but similar to other iron-formation occurrences from the Arabian-Nubian Shield, the Nd isotopic compositions of the Wadi Hamama iron formations are predominantly mantle-like. SIMS U-Pb zircon ages of the host volcaniclastic units indicate that the age of iron-formation deposition is ca. 695 Ma, which is within the Sturtian epoch that is presumed to be a glacial event of global extent. Nevertheless, there is no robust evidence of any influence of Sturtian glaciation in the Arabian-Nubian Shield. Our results rather suggest that the iron formations in the area may have formed as low-temperature exhalites on the floor of an island-arc basin. The iron formations were deposited during periods of volcanic quiescence, with metals having been derived during low-temperature pervasive hydrothermal alteration of volcanic and volcaniclastic rocks exposed at the seafloor-seawater interface. Precipitation took place due to mixing of metal-bearing hydrothermal fluids and cold, oxygenated seawater. There is no need to invoke possible effects of global glaciation to explain the origin of the Sturtian-aged iron formations in the shield. Our study thus suggests that not all Neoproterozoic iron formations are necessarily linked to glacial events as the Hamama deposit represents a non-Rapitan exhalative iron formation.
KeywordCryogenian Exhalite Hydrothermal Iron formations Island arc Sturtian glaciation
DOI10.1007/s00126-019-00898-0
WOS KeywordRARE-EARTH-ELEMENTS ; CENTRAL EASTERN DESERT ; TRACE-ELEMENT ; HYDROTHERMAL FLUIDS ; U-PB ; ATMOSPHERIC OXYGEN ; TECTONIC EVOLUTION ; CRUSTAL EVOLUTION ; GEOCHEMISTRY ; SEAWATER
Language英语
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000516969400011
PublisherSPRINGER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95584
Collection岩石圈演化国家重点实验室
Corresponding AuthorAbd El-Rahman, Yasser
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Cairo Univ, Fac Sci, Geol Dept, Giza 12613, Egypt
3.TU Bergakad Freiberg, Dept Mineral, D-09596 Freiberg, Germany
4.Helmholtz Inst Freiberg Resource Technol, D-09599 Freiberg, Germany
5.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
First Author AffilicationState Key Laboratory of Lithospheric Evolution
Corresponding Author AffilicationState Key Laboratory of Lithospheric Evolution
Recommended Citation
GB/T 7714
Abd El-Rahman, Yasser,Gutzmer, Jens,Li, Xian-Hua,et al. Not all Neoproterozoic iron formations are glaciogenic: Sturtian-aged non-Rapitan exhalative iron formations from the Arabian-Nubian Shield[J]. MINERALIUM DEPOSITA,2020,55(3):577-596.
APA Abd El-Rahman, Yasser.,Gutzmer, Jens.,Li, Xian-Hua.,Seifert, Thomas.,Li, Chao-Feng.,...&Li, Jiao.(2020).Not all Neoproterozoic iron formations are glaciogenic: Sturtian-aged non-Rapitan exhalative iron formations from the Arabian-Nubian Shield.MINERALIUM DEPOSITA,55(3),577-596.
MLA Abd El-Rahman, Yasser,et al."Not all Neoproterozoic iron formations are glaciogenic: Sturtian-aged non-Rapitan exhalative iron formations from the Arabian-Nubian Shield".MINERALIUM DEPOSITA 55.3(2020):577-596.
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