Arid
DOI10.1134/S0016852114060041
Finite strain analysis of metavolcanics and metapyroclastics in gold-bearing shear zone of the Dungash area, Central Eastern Desert, Egypt
Kassem, Osama M. K.1,2; Abd El Rahim, Said H.2
通讯作者Kassem, Osama M. K.
来源期刊GEOTECTONICS
ISSN0016-8521
EISSN1556-1976
出版年2014
卷号48期号:6页码:483-495
英文摘要

The Dungash gold mine area is situated in an EW-trending quartz vein along a shear zone in metavolcanic and metasedimentary host rocks in the Eastern Desert of Egypt. These rocks are associated with the major geologic structures, which are attributed to various deformational stages of the Neoproterozoic basement rocks. Field geology, finite strain and microstructural analyses were carried out and the relation-ships between the lithological contacts and major/minor structures have been studied. The R (f)/I center dot and Fry methods were applied on the metavolcano-sedimentary and metapyroclastic samples from 5 quartz veins samples, 7 metavolcanics samples, 3 metasedimentary samples and 4 metapyroclastic samples in Dungash area. Finite-strain data show that a low to moderate range of deformation of the metavolcano-sedimentary samples and axial ratios in the XZ section range from 1.70 to 4.80 for the R (f)/I center dot method and from 1.65 to 4.50 for the Fry method. We conclude that finite strain in the deformed rocks is of the same order of magnitude for all units of metavolcano-sedimentary rocks. Furthermore, the contact between principal rock units is sheared in the Dungash area under brittle to semi-ductile deformation conditions. In this case, the accumulated finite strain is associated with the deformation during thrusting to assemble nappe structure. It indicates that the sheared contacts have been formed during the accumulation of finite strain.


英文关键词finite strain microstructural Dungash area Neoproterozoic rocks Eastern Desert of Egypt
类型Article
语种英语
国家Saudi Arabia ; Egypt
收录类别SCI-E
WOS记录号WOS:000346025800005
WOS关键词WADI MUBARAK BELT ; FLUID INCLUSIONS ; NORTHERN THRUST ; ORE-DEPOSITS ; MINERALIZATION ; ROCKS ; ORIGIN ; EVOLUTION ; MINE ; CLASSIFICATION
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
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/2XILL650/182323
作者单位1.King Saud Univ, Fac Sci, Dept Geol, SGSRC, Riyadh 11451, Saudi Arabia;
2.Natl Res Ctr, Dept Geol, Cairo 12622, Egypt
推荐引用方式
GB/T 7714
Kassem, Osama M. K.,Abd El Rahim, Said H.. Finite strain analysis of metavolcanics and metapyroclastics in gold-bearing shear zone of the Dungash area, Central Eastern Desert, Egypt[J]. King Saud University,2014,48(6):483-495.
APA Kassem, Osama M. K.,&Abd El Rahim, Said H..(2014).Finite strain analysis of metavolcanics and metapyroclastics in gold-bearing shear zone of the Dungash area, Central Eastern Desert, Egypt.GEOTECTONICS,48(6),483-495.
MLA Kassem, Osama M. K.,et al."Finite strain analysis of metavolcanics and metapyroclastics in gold-bearing shear zone of the Dungash area, Central Eastern Desert, Egypt".GEOTECTONICS 48.6(2014):483-495.
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