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DOI | 10.1016/j.jafrearsci.2008.01.004 |
Geochemistry and metamorphism of the Pan-African back-arc Malhaq volcano-sedimentary Neoproterozoic association, W. Kid area, SE Sinai, Egypt | |
Abu El-Enen, Mahrous M. | |
通讯作者 | Abu El-Enen, Mahrous M. |
来源期刊 | JOURNAL OF AFRICAN EARTH SCIENCES
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ISSN | 1464-343X |
出版年 | 2008 |
卷号 | 51期号:4页码:189-206 |
英文摘要 | The northern part of the Kid metamorphic complex, SE Sinai Peninsula, Egypt, comprises a thick sequence of volcano-sedimentary association, defined as Mahlaq Formation. It is composed predominantly of rhyodacitic to andesitic, less commonly of subalkaline basaltic metavolcanics and metatuffs interbedded and intercalated with metapelites and metagraywackes. Their bulk rock chemistry indicates that the magmatic rocks have calc-alkaline affinity, and derived from island are - mid-oceanic ridge transitional regimes, presumably in a back-arc setting. Their peak mineral assemblages, mineral chemistry and calculated P-T metamorphic conditions indicate that the Malhaq association underwent metamorphism of lower amphibolite facies (480-570 degrees C/3-4 kbar), except the extreme northeastern part of upper amphibolite facies (645 degrees C/4.5-5.5 kbar). Geothermal gradients of the investigated metamorphic rocks range from 37 to 43 degrees C/km, may indicate that metamorphism took place in the upper plate of an active continental margin. Three deformation phases, D-1 to D-3, are recognized at the Malhaq nappe area, where peak metamorphic conditions occurred synchronous with the NW-directed thrusting during the D-2 phase. Possible heat sources during metamorphism is that resulted from heating contributing from the mantle derived magma in the documented arc environment in addition to the shear "stress" heating released during thrusting and stacking of the Malhaq nappe pile onto the older continental crust during the Pan-African orogeny. Metamorphic conditions increase northward coincident with NW-ward stacking propagation of the Neoproterozoic nappe that formed when the Mozambique Ocean had closed as a result of the assembly of East and West Gondwana during the Pan-African Orogeny. (C) 2008 Elsevier Ltd. All rights reserved. |
英文关键词 | Arabian-Nubian shield (ANS) Sinai Peninsula Pan-African back-arc volcano-sedimentary association amphibolite facies |
类型 | Article |
语种 | 英语 |
国家 | Egypt |
收录类别 | SCI-E |
WOS记录号 | WOS:000257007700002 |
WOS关键词 | ARABIAN-NUBIAN SHIELD ; EASTERN DESERT ; CORE COMPLEX ; SOUTHEASTERN SINAI ; WADI KID ; REGIONAL METAMORPHISM ; OBLIQUE CONVERGENCE ; CRUSTAL EVOLUTION ; IMMOBILE ELEMENTS ; SOUTHERN ISRAEL |
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/2XILL650/157827 |
作者单位 | (1)Mansoura Univ, Fac Sci, Dept Geol, Mansoura 35516, Egypt |
推荐引用方式 GB/T 7714 | Abu El-Enen, Mahrous M.. Geochemistry and metamorphism of the Pan-African back-arc Malhaq volcano-sedimentary Neoproterozoic association, W. Kid area, SE Sinai, Egypt[J],2008,51(4):189-206. |
APA | Abu El-Enen, Mahrous M..(2008).Geochemistry and metamorphism of the Pan-African back-arc Malhaq volcano-sedimentary Neoproterozoic association, W. Kid area, SE Sinai, Egypt.JOURNAL OF AFRICAN EARTH SCIENCES,51(4),189-206. |
MLA | Abu El-Enen, Mahrous M.."Geochemistry and metamorphism of the Pan-African back-arc Malhaq volcano-sedimentary Neoproterozoic association, W. Kid area, SE Sinai, Egypt".JOURNAL OF AFRICAN EARTH SCIENCES 51.4(2008):189-206. |
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