Arid
DOI10.1007/s00531-018-1601-2
Mineral chemistry and geochemistry of ophiolitic metaultramafics from Um Halham and Fawakhir, Central Eastern Desert, Egypt
Abdel-Karim, Abdel-Aal M.1; Ali, Shehata2; El-Shafei, Shaimaa A.1
通讯作者Ali, Shehata
来源期刊INTERNATIONAL JOURNAL OF EARTH SCIENCES
ISSN1437-3254
EISSN1437-3262
出版年2018
卷号107期号:7
英文摘要

This study is focused on ophiolitic metaultramafics from Um Halham and Fawakhir, Central Eastern Desert of Egypt. The rocks include serpentinized peridotites, serpentinites together with talc- and quartz-carbonates. The primary spinel relict is Al-chromite [Cr#>60], which is replaced by Cr-magnetite during metamorphism. The high Cr# of Al-chromites resembles supra-subduction zone (SSZ) peridotites and suggests derivation from the deeper portion of the mantle section with boninitic affinity. These mantle rocks equilibrated with boninitic melt have been generated by high melting degrees. The estimated melting degrees (similar to 19-24%) lie within the range of SSZ peridotites. The high Cr# of spinel and Fo content of olivine together with the narrow compositional range suggest a mantle residual origin. Serpentinized peridotite and serpentinites have low Al2O3/SiO2 ratios (mostly <0.03) like fore-arc mantle wedge serpentinites and further indicate that their mantle protolith had experienced partial melting before serpentinization process. Moreover, they have very low Nb, Ta, Zr and Hf concentrations along with sub-chondritic Nb/Ta (0.3-16) and Zr/Hf (mostly 1-20) ratios further confirming that their mantle source was depleted by earlier melting extraction event. The high chondrite normalized (La/Sm)(N) ratios (average 10) reflect input of subduction-related slab melts/fluids into their mantle source.


英文关键词Ophiolite Fore-arc Fawakhir Um Halham Egypt
类型Article
语种英语
国家Egypt
收录类别SCI-E
WOS记录号WOS:000445225200002
WOS关键词RARE-EARTH PATTERNS ; MID-ATLANTIC RIDGE ; ABYSSAL PERIDOTITES ; MANTLE PERIDOTITES ; SUBDUCTION ZONE ; SUPRA-SUBDUCTION ; SUTURE ZONE ; NEOPROTEROZOIC OPHIOLITE ; COMPOSITIONAL VARIATION ; CHROMIAN SPINEL
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/2XILL650/210184
作者单位1.Zagazig Univ, Fac Sci, Geol Dept, Zagazig 44519, Egypt;
2.Menia Univ, Fac Sci, Geol Dept, Al Minya 61519, Egypt
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GB/T 7714
Abdel-Karim, Abdel-Aal M.,Ali, Shehata,El-Shafei, Shaimaa A.. Mineral chemistry and geochemistry of ophiolitic metaultramafics from Um Halham and Fawakhir, Central Eastern Desert, Egypt[J],2018,107(7).
APA Abdel-Karim, Abdel-Aal M.,Ali, Shehata,&El-Shafei, Shaimaa A..(2018).Mineral chemistry and geochemistry of ophiolitic metaultramafics from Um Halham and Fawakhir, Central Eastern Desert, Egypt.INTERNATIONAL JOURNAL OF EARTH SCIENCES,107(7).
MLA Abdel-Karim, Abdel-Aal M.,et al."Mineral chemistry and geochemistry of ophiolitic metaultramafics from Um Halham and Fawakhir, Central Eastern Desert, Egypt".INTERNATIONAL JOURNAL OF EARTH SCIENCES 107.7(2018).
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