Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.1080/00206814.2019.1652942 |
| Geochemistry and fore-arc evolution of upper mantle peridotites in the Cryogenian Bir Umq ophiolite, Arabian Shield, Saudi Arabia | |
| Abuamarah, Bassam A. | |
| 通讯作者 | Abuamarah, Bassam A. |
| 来源期刊 | INTERNATIONAL GEOLOGY REVIEW
 |
| ISSN | 0020-6814 |
| EISSN | 1938-2839 |
| 出版年 | 2020 |
| 卷号 | 62期号:5页码:630-648 |
| 英文摘要 | The Bir Umq ophiolite is one of the most important ophiolitic successions in the Arabian Shield, and represents an excellent case for the study of the tectonomagmatic evolution of the earliest Precambrian events in the juvenile part of the Arabian-Nubian Shield (ANS). It is a dismembered ophiolite, which includes a serpentinized peridotite with small amounts of gabbro and melange, and is overlain by the Sumayir formation. The mantle section of the Bir Umq ophiolite has been pervasively sheared and folded during its emplacement and is extensively serpentinized, carbonated and silicified, resulting in the common development of magnesite and listwaenite along the shear zones. Listwaenite occurs in the form of upstanding ridges due to its resistance to erosion. Antigorite is the main serpentine mineral, which, however, has low amounts of lizardite and chrysotile, indicating that the present serpentinites formed by prograde metamorphism. The ophiolitic rocks of Bir Umq have undergone regional metamorphism up to the greenschist to amphibolite facies. The presence of mesh and bastite textures indicates harzburgite and dunite protoliths. The serpentinized peridotite preserves rare relicts of primary minerals such as olivine, pyroxene and Cr-spinel. The serpentinized ultramafics of Bir Umq have high Mg# [molar Mg/(Mg+Fe2+); 0.90-0.93), low CaO, and Al2O3 contents similar to that of the environment of the suprasubduction zone. Additionally, they are characterized by the depletion of some compatible trace elements (e.g., Nb, Sr, Ta, Zr, Hf and REE), but show a wide variation in the Rb and Ba. Moreover, they are enriched in some elements that have affinities for Mg-rich minerals such as Ni, Cr, V, and Co. Fresh relics of olivine have high Fo (av. 0.91) and NiO (av. 0.42) contents, similar to those in the mantle olivine. The fresh Cr-spinel has high Cr# (0.68) and low TiO2 content (av. 0.11), similar to those in modern fore-arc peridotites. The composition of both orth- and clinopyroxenes confirms the fore-arc affinity of the studied ultramafics. The present study indicates that the protoliths of the serpentinized ultramafics of Bir Umq have high partial melt degrees, which is consistent with the characteristics of ultramafic rocks formed in a subarc environment (fore-arc) within a suprasubduction zone system. |
| 英文关键词 | Arabian-Nubian shield serpentinized peridotite fore-arc kammererite |
| 类型 | Article |
| 语种 | 英语 |
| 国家 | Saudi Arabia |
| 收录类别 | SCI-E |
| WOS记录号 | WOS:000480941400001 |
| WOS关键词 | SOUTH EASTERN DESERT ; MAFIC-ULTRAMAFIC INTRUSION ; NEOPROTEROZOIC OPHIOLITES ; CHROMIAN SPINEL ; NUBIAN SHIELD ; ALASKAN-TYPE ; CR-SPINEL ; EGYPT IMPLICATIONS ; BONINITIC MELT ; CRUSTAL GROWTH |
| WOS类目 | Geology |
| WOS研究方向 | Geology |
| 来源机构 | King Saud University |
| 资源类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/216321 |
| 作者单位 | King Saud Univ, Dept Geol & Geophys, Riyadh 11451, Saudi Arabia |
| 推荐引用方式 GB/T 7714 | Abuamarah, Bassam A.. Geochemistry and fore-arc evolution of upper mantle peridotites in the Cryogenian Bir Umq ophiolite, Arabian Shield, Saudi Arabia[J]. King Saud University,2020,62(5):630-648. |
| APA | Abuamarah, Bassam A..(2020).Geochemistry and fore-arc evolution of upper mantle peridotites in the Cryogenian Bir Umq ophiolite, Arabian Shield, Saudi Arabia.INTERNATIONAL GEOLOGY REVIEW,62(5),630-648. |
| MLA | Abuamarah, Bassam A.."Geochemistry and fore-arc evolution of upper mantle peridotites in the Cryogenian Bir Umq ophiolite, Arabian Shield, Saudi Arabia".INTERNATIONAL GEOLOGY REVIEW 62.5(2020):630-648. |
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