Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 1464-343X |
EISSN | 1879-1956 |
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 |
推荐引用方式 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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