Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/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
![]() |
ISSN | 1437-3254 |
EISSN | 1437-3262 |
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. |
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。