Not all Neoproterozoic iron formations are glaciogenic: Sturtian-aged non-Rapitan exhalative iron formations from the Arabian-Nubian Shield
文献类型：期刊论文
| 作者 | Abd El-Rahman, Yasser1,4; Gutzmer, Jens2,5; Li, Xian-Hua3,4; Seifert, Thomas5; Li, Chao-Feng4; Ling, Xiao-Xiao4; Li, Jiao4 |
| 刊名 | MINERALIUM DEPOSITA
 |
| 出版日期 | 2020-03-01 |
| 卷号 | 55期号:3页码:577-596 |
| 关键词 | Cryogenian Exhalite Hydrothermal Iron formations Island arc Sturtian glaciation |
| ISSN号 | 0026-4598 |
| DOI | 10.1007/s00126-019-00898-0 |
| 英文摘要 | Neoproterozoic 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. |
| WOS关键词 | RARE-EARTH-ELEMENTS ; CENTRAL EASTERN DESERT ; TRACE-ELEMENT ; HYDROTHERMAL FLUIDS ; U-PB ; ATMOSPHERIC OXYGEN ; TECTONIC EVOLUTION ; CRUSTAL EVOLUTION ; GEOCHEMISTRY ; SEAWATER |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000516969400011 |
| 出版者 | SPRINGER |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/95584]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Abd El-Rahman, Yasser |
| 作者单位 | 1.Cairo Univ, Fac Sci, Geol Dept, Giza 12613, Egypt 2.Helmholtz Inst Freiberg Resource Technol, D-09599 Freiberg, Germany 3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 5.TU Bergakad Freiberg, Dept Mineral, D-09596 Freiberg, Germany |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：地质与地球物理研究所
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