Arid
DOI10.1016/j.jafrearsci.2017.08.008
Lead isotope evolution across the Neoproterozoic boundary between craton and juvenile crust, Bayuda Desert, Sudan
Evuk, David1; Lucassen, Friedrich2,3; Franz, Gerhard4
通讯作者Lucassen, Friedrich
来源期刊JOURNAL OF AFRICAN EARTH SCIENCES
ISSN1464-343X
EISSN1879-1956
出版年2017
卷号135页码:72-81
英文摘要

Metaigneous mafic and ultramafic rocks from the juvenile Neoproterozoic Arabian Nubian Shield (ANS) and the Proterozoic, reworked Saharan Metacraton (SMC) have been analysed for major- and trace elements and Sr, Nd, and Pb isotopes. Most of the rocks are amphibolites metamorphosed at amphibolite facies conditions, some with relicts of a granulite facies stage. The other rocks are metapyroxenites, metagabbros, and some ultramafic rocks. Trace element compositions of the metabasaltic (dominantly tholeiitic) rocks resemble the patterns of island arcs and primitive lavas from continental arcs. Variable Sr and Nd isotope ratios indicate depleted mantle dominance for most of the samples. Pb-207/Pb-204 signatures distinguish between the influence of high Pb-207/Pb-204 old SMC crust and depleted mantle signatures of the juvenile ANS crust. The Pb isotope signatures for most metabasaltic rocks, metapyroxenites and metagabbros from SMC indicate an autochthonous formation. The interpretation of the new data together with published evidence from mafic xenoliths on SMC and ophiolite from ANS allows an extrapolation of mantle evolution in time. There are two lines of evolution in the regional mantle, one, which incorporates potential upper crust material during Neoproterozoic, and a second one with a depleted mantle signature since pre-Neoproterozoic that still is present in the Red Sea and Gulf of Aden spreading centres. (C) 2017 Elsevier Ltd. All rights reserved.


英文关键词Neoproterozoic Mafic-ultramafic rocks Elemental composition Pb isotope composition Sr isotope composition Nd isotope composition Mantle evolution NE-Africa (Bayuda Desert) Ophiolite
类型Article
语种英语
国家South Sudan ; Germany
收录类别SCI-E
WOS记录号WOS:000413879000007
WOS关键词ARABIAN-NUBIAN SHIELD ; SAHARA GHOST CRATON ; EAST-AFRICAN OROGEN ; RED-SEA ; CHEMICAL CLASSIFICATION ; VOLCANIC ACTIVITY ; KERAF SUTURE ; NE SUDAN ; MANTLE ; ND
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/2XILL650/199958
作者单位1.Univ Juba, Coll Nat Resources & Environm Studies, Dept Geol & Min, Juba, South Sudan;
2.Univ Bremen, Dept Geosci, D-28334 Bremen, Germany;
3.Univ Bremen, MARUM Ctr Marine Environm Sci, D-28334 Bremen, Germany;
4.Tech Univ Berlin, Dept Mineral Petrol, Ackerstr 76, D-13355 Berlin, Germany
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GB/T 7714
Evuk, David,Lucassen, Friedrich,Franz, Gerhard. Lead isotope evolution across the Neoproterozoic boundary between craton and juvenile crust, Bayuda Desert, Sudan[J],2017,135:72-81.
APA Evuk, David,Lucassen, Friedrich,&Franz, Gerhard.(2017).Lead isotope evolution across the Neoproterozoic boundary between craton and juvenile crust, Bayuda Desert, Sudan.JOURNAL OF AFRICAN EARTH SCIENCES,135,72-81.
MLA Evuk, David,et al."Lead isotope evolution across the Neoproterozoic boundary between craton and juvenile crust, Bayuda Desert, Sudan".JOURNAL OF AFRICAN EARTH SCIENCES 135(2017):72-81.
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