Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/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
![]() |
ISSN | 1437-3254 |
EISSN | 1437-3262 |
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 |
推荐引用方式 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). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。