Arid
DOI10.1007/s005310050304
Geochemistry, petrogenesis and tectonic setting of late Neoproterozoic Dokhan-type volcanic rocks in the Fatira area, eastern Egypt
Mohamed, FH; Moghazi, AM; Hassanen, MA
通讯作者Mohamed, FH
来源期刊INTERNATIONAL JOURNAL OF EARTH SCIENCES
ISSN1437-3254
出版年2000
卷号88期号:4页码:764-777
英文摘要

The Neoproterozoic Dokhan volcanics of the Fatira area in eastern Egypt comprise two main rock suites: (a) an intermediate volcanic suite, consisting of basaltic andesite, andesite, dacite, and their associated pyroclastic rocks; and (b) a felsic volcanic suite composed of rhyolite and rhyolitic tuffs. The two suites display well-defined major and trace element trends and a continuum in composition with wide ranges in sie, (54-76%), CaO (8.19-0.14%), MgO (6.96-0.04%), Sr (983-7 ppm), Zr (328-95 ppm), Cr (297-1 ppm), and Ni (72-1 ppm). They are enriched in LILEs (Rb, Ba, K, Th, Ce) relative to high field strength elements (Nb, Zr, P, Ti) and show strong affinity to calc-alkaline subduction-related rocks. However, their undeformed character, their emplacement temporally and spatially with post-orogenic A-type granite, and their high Zr/Y values suggest that their emplacement follow the cessation of subduction in eastern Egypt in an extensional-related within-plate setting. Major and trace element variations in the intermediate volcanics are consistent with their formation via partial melting of an enriched subcontinental lithospheric mantle source followed by a limited low-pressure fractional crystallization of olivine and pyroxene before emplacement. The LILE enrichment relative to HFSE is attributed to the inheritance of a subduction component from mantle material which constituted the mantle wedge during previous subduction events in eastern Egypt. The evolution of the whole volcanic spectrum was governed mainly by crystal/melt fractionation of amphibole, plagioclase, titanomagnetite, and apatite in the intermediate varieties and plagioclase, amphibole, biotite, Fe-Ti oxides, apatite. and zircon in the felsic varieties. At each stage of evolution, crystal fractionation was accompanied by variable degrees of crustal contamination.


英文关键词Neoproterozoic Dokhan volcanics Egypt geochemistry petrogenesis
类型Article
语种英语
国家Egypt
收录类别SCI-E
WOS记录号WOS:000088003200016
WOS关键词NORTHERN NUBIAN SHIELD ; RARE-EARTH ELEMENTS ; A-TYPE GRANITES ; ISOTOPIC CONSTRAINTS ; CRUSTAL EVOLUTION ; SOUTHERN ISRAEL ; ISLAND-ARC ; DESERT ; ORIGIN ; MAGMA
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/2XILL650/139154
作者单位(1)Univ Alexandria, Fac Sci, Dept Geol, Alexandria, Egypt
推荐引用方式
GB/T 7714
Mohamed, FH,Moghazi, AM,Hassanen, MA. Geochemistry, petrogenesis and tectonic setting of late Neoproterozoic Dokhan-type volcanic rocks in the Fatira area, eastern Egypt[J],2000,88(4):764-777.
APA Mohamed, FH,Moghazi, AM,&Hassanen, MA.(2000).Geochemistry, petrogenesis and tectonic setting of late Neoproterozoic Dokhan-type volcanic rocks in the Fatira area, eastern Egypt.INTERNATIONAL JOURNAL OF EARTH SCIENCES,88(4),764-777.
MLA Mohamed, FH,et al."Geochemistry, petrogenesis and tectonic setting of late Neoproterozoic Dokhan-type volcanic rocks in the Fatira area, eastern Egypt".INTERNATIONAL JOURNAL OF EARTH SCIENCES 88.4(2000):764-777.
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