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DOI | 10.1016/j.lithos.2016.08.014 |
Petrogenesis of the Alaskan-type mafic-ultramafic complex in the Makkah quadrangle, western Arabian Shield, Saudi Arabia | |
Habtoor, Abdelmonem1; Ahmed, Ahmed Hassan1,2; Harbi, Hesham1 | |
通讯作者 | Ahmed, Ahmed Hassan |
来源期刊 | LITHOS
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ISSN | 0024-4937 |
EISSN | 1872-6143 |
出版年 | 2016 |
卷号 | 263页码:33-51 |
英文摘要 | The Makkah quadrangle is a part of the Jeddah terrane in the Precambrian basement, Western Arabian Shield of Saudi Arabia. Gabal Taftafan mafic-ultramafic complex lies within the central part of the Makkah quadrangle. The Taftafan mafic-ultramafic complex is a well-differentiated rock association which comprises of dunite core, hornblende- and plagioclase-bearing peridotites, troctolite, clinopyroxenite and marginal gabbro, in a distinctive zonal structure. The bulk-rock geochemistry of the Taftafan mafic-ultramafic rocks is characterized by a tholeiitic/sub-alkaline affinity with high Mg in the ultramafic core (0.84) and is systematically decreased towards the marginal gabbro (0.60). The patterns of trace elements show enrichment in the fluid-mobile elements (Sr, Ba) and a pronounced negative Nb anomaly which reflect a hydrous parental magma generated in a subduction tectonic setting. The mafic-ultramafic rocks of the Taftafan complex have low total rare earth elements (REE) displaying sub-parallel patterns leading to the assumption that these rocks are comagmatic and are formed by fractional crystallization from a common magma type. The platinum-group elements (PGE) content of all rock types in the Taftafan complex is very low, with Sigma PPGE > Sigma IPGE; displaying slightly positive slopes of the PGE distribution patterns. The chemistry of ferromagnesian minerals is characterized by a high forsterite (Fo) olivine with wide range (Fo(91-67)), from ultramafic core to the marginal gabbro, Ca-rich diopsidic clinopyroxene, and calcic hornblende. Orthopyroxene is almost absent from all rock types, or very rare when present. Hornblende and Ca-plagioclase possess the longest crystallization history since they are present in almost all rock types of the complex. Spinets in the dunite and hornblende-bearing peridotite core show homogeneous composition with intermediate Cr# (0.53-0.67). Plagioclase-bearing peridotite and troctolite have two exsolved types of spinet; Al-rich and Fe-rich varieties. All spinet varieties in the mafic-ultramafic rocks have high Fe3+ and TiO2 contents. The estimated melt composition in equilibrium with Gabal Taftafan complex is mostly similar to that of the SSZ boninitic magmas. The Taftafan mafic-ultramafic rocks show many similarities with the Alaskan-type mafic-ultramafic complexes, including the internal zonal lithology, bulk rock geochemistry, and mineral chemistry. Thus, it is neither related to a fragment of ophiolite sequence nor to the stratiform mafic-ultramafic intrusion. The location of the Taftafan complex along a major fracture zone parallel to the suture between Jeddah and Asir terranes in addition to the aforementioned striking similarities to the Alaskan-type complexes, suggests a formation in subduction-related setting from a common hydrous mafic magma. (C) 2016 Elsevier B.V. All rights reserved. |
英文关键词 | Alaskan-type Fractional crystallization Taftafan complex Arabian Shield Saudi Arabia |
类型 | Article |
语种 | 英语 |
国家 | Saudi Arabia ; Egypt |
收录类别 | SCI-E |
WOS记录号 | WOS:000385325200004 |
WOS关键词 | SOUTH EASTERN DESERT ; ISLAND-ARC ; SM-ND ; GEOCHEMICAL CHARACTERISTICS ; NEOPROTEROZOIC OPHIOLITE ; PODIFORM CHROMITITES ; SUPERIOR PROVINCE ; CHROMIAN SPINEL ; OMAN OPHIOLITE ; GABBRO AKAREM |
WOS类目 | Geochemistry & Geophysics ; Mineralogy |
WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/194983 |
作者单位 | 1.King Abdulaziz Univ, Fac Earth Sci, Jeddah, Saudi Arabia; 2.Helwan Univ, Fac Sci, Dept Geol, Cairo, Egypt |
推荐引用方式 GB/T 7714 | Habtoor, Abdelmonem,Ahmed, Ahmed Hassan,Harbi, Hesham. Petrogenesis of the Alaskan-type mafic-ultramafic complex in the Makkah quadrangle, western Arabian Shield, Saudi Arabia[J],2016,263:33-51. |
APA | Habtoor, Abdelmonem,Ahmed, Ahmed Hassan,&Harbi, Hesham.(2016).Petrogenesis of the Alaskan-type mafic-ultramafic complex in the Makkah quadrangle, western Arabian Shield, Saudi Arabia.LITHOS,263,33-51. |
MLA | Habtoor, Abdelmonem,et al."Petrogenesis of the Alaskan-type mafic-ultramafic complex in the Makkah quadrangle, western Arabian Shield, Saudi Arabia".LITHOS 263(2016):33-51. |
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