Arid
DOI10.1007/s00531-008-0385-1
Origin of a late Neoproterozoic (605 +/- A 13 Ma) intrusive carbonate-albitite complex in Southern Sinai, Egypt
Azer, Mokhles Kamal1; Stern, Robert J.2; Kimura, Jin-Ichi3
通讯作者Azer, Mokhles Kamal
来源期刊INTERNATIONAL JOURNAL OF EARTH SCIENCES
ISSN1437-3254
EISSN1437-3262
出版年2010
卷号99期号:2页码:245-267
英文摘要

New geochemical, isotopic, and geochronological data and interpretations are presented for late Neoproterozoic intrusive carbonates and related rocks of southern Sinai, Egypt (northernmost Arabian-Nubian Shield). The Tarr carbonates are coarsely crystalline and related to explosive emplacement of hypabyssal and volcanic albitite at 605 +/- A 13 Ma. The carbonates associated with the albitites are divisible into two types: primary dolomitite and secondary breunneritite (Fe-rich magnesite). The dolomitite was clearly intrusive but differs from classic igneous carbonatites, containing much lower abundances of incompatible elements, such as REE, U, Th, Rb, Nb, Y, P, Sr, Zr, Ba, and total alkalies. The breunneritite is a secondary replacement of dolomitite, probably marking the roots of a vigorous hydrothermal system. Albitites show pristine abundances of major and trace elements and were not subjected to a major metamorphic overprint. They are relatively more fractionated, alkaline and related to within-plate A-type magmas, were emplaced in an extensional or non-compressive tectonic regime in the cupola of high-level A-type granite. Tarr albitites may represent residual magma remaining after near-total crystallization of an A-type granite pluton at depth, forcibly emplaced into the roof above the cooling pluton. The intrusive dolomitite exsolved from highly differentiated albitite melt, in the apical regions of a still-buried alkaline "A-type" granite pluton that was rich in CO2; these volatiles migrated upwards and towards the cooler margins of the magma body. Late NNE-SSW extension allowed a shallow-level cupola to form, into which albitite melts and carbonate fluids migrated, culminating in explosive emplacement of albitite breccia and intrusive carbonate. Isotopic compositions of Tarr dolomitite and albitite indicate these are consanguineous and ultimately of mantle origin. Magmatic volatiles fenitized the wall rock, while submarine hydrothermal activity transformed some of the dolomitite into breunneritite. Recognition of Tarr-type should encourage similar hypabyssal complex intrusions to be sought for in association with A-type granitic plutons elsewhere.


英文关键词Albitite Magmatic cupola Intrusive dolomitite Sr, Nd isotopes Geochronology
类型Review
语种英语
国家Egypt ; USA ; Japan
收录类别SCI-E
WOS记录号WOS:000274385900001
WOS关键词ARABIAN-NUBIAN SHIELD ; METAMORPHIC CORE COMPLEX ; EAST-AFRICAN OROGEN ; U-TH-PB ; CRUSTAL EVOLUTION ; LIQUID IMMISCIBILITY ; SOUTHEASTERN DESERT ; ALKALINE MAGMATISM ; NORTHEAST AFRICA ; FLUID INCLUSION
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/2XILL650/164661
作者单位1.Natl Res Ctr, Dept Geol, Cairo 12622, Egypt;
2.Univ Texas Dallas, Dept Geosci, Richardson, TX 75083 USA;
3.Japan Agcy Marine Earth Sci & Technol, IFREE, Yokosuka, Kanagawa 2370061, Japan
推荐引用方式
GB/T 7714
Azer, Mokhles Kamal,Stern, Robert J.,Kimura, Jin-Ichi. Origin of a late Neoproterozoic (605 +/- A 13 Ma) intrusive carbonate-albitite complex in Southern Sinai, Egypt[J],2010,99(2):245-267.
APA Azer, Mokhles Kamal,Stern, Robert J.,&Kimura, Jin-Ichi.(2010).Origin of a late Neoproterozoic (605 +/- A 13 Ma) intrusive carbonate-albitite complex in Southern Sinai, Egypt.INTERNATIONAL JOURNAL OF EARTH SCIENCES,99(2),245-267.
MLA Azer, Mokhles Kamal,et al."Origin of a late Neoproterozoic (605 +/- A 13 Ma) intrusive carbonate-albitite complex in Southern Sinai, Egypt".INTERNATIONAL JOURNAL OF EARTH SCIENCES 99.2(2010):245-267.
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