干旱区生态环境知识资源中心(Arid): Neoproterozoic geodynamic evolution of easternmost Kalahari: Constraints from U-Pb-Hf-O zircon, Sm-Nd isotope and geochemical data from the Schirmacher Oasis, East Antarctica

Arid

DOI	10.1016/j.precamres.2019.105553
	Neoproterozoic geodynamic evolution of easternmost Kalahari: Constraints from U-Pb-Hf-O zircon, Sm-Nd isotope and geochemical data from the Schirmacher Oasis, East Antarctica
	Jacobs, J.1; Mikhalsky, E.2; Henjes-Kunst, F.3,8; Laeufer, A.3; Thomas, R. J.4; Elburg, M. A.5; Wang, C-C 1; Estrada, S.3; Skublov, S.6,7
通讯作者	Jacobs, J.
来源期刊	PRECAMBRIAN RESEARCH
ISSN	0301-9268
EISSN	1872-7433
出版年	2020
卷号	342
英文摘要	Late Tonian (ca. 785-760 Ma) granodioritic to granitic orthogneisses of the Schirmacher Oasis region in Dronning Maud Land (DML), East Antarctica, are interpreted as recording an active continental margin setting at the periphery of Kalahari and Rodinia. The rocks probably represent exposures of a significant tectonic province hidden beneath the ice, the erosional remnants of which are recorded as detrital zircons in late TonianCryogenian metasedimentary rocks throughout central and eastern DML, as well as in ice-rafted debris from recent sediments offshore Dronning Maud Land. The orthogneisses have single-stage Sm-Nd model ages of ca. 1.3-1.5 Ga and zircon Hf-signatures (epsilon Hf-t=+2 - +5), indistinguishable from the adjacent Grenville-age basement rocks of easternmost Kalahari. Their geochemistry suggests that they evolved in the late stages of a continental margin magmatic arc and possibly within a roll-back tectonic framework, suggestive of subduction of relatively old oceanic lithosphere. The eastern Kalahari continental arc is one of a number of continental arcs that characterize the western part of the fragmenting Rodinia and document the supercontinent turning inside out after its formation at ca. 1000 Ma and a period of relative tectonic quiescence between ca. 900 and 800 Ma. The rocks show an ultra-high temperature metamorphic overprint that was accompanied by syn-tectonic magmatism from ca. 650 to 600 Ma. The high temperature metamorphism is interpreted to relate to back-arc extension that also led to major anorthosite magmatism elsewhere, prior to continental collision in the region. The rocks lack the subsequent widespread high-grade metamorphic overprint at ca. 590-500 Ma which occurs in the adjacent regions due to Himalayan-style continental collision along the East African-Antarctic Orogen during Gondwana assembly.
英文关键词	Dronning Maud Land Continental arc Tonian Rodinia Extroversion Zircon Schirmacher Oasis
类型	Article
语种	英语
国家	Norway ; Russia ; Germany ; South Africa
收录类别	SCI-E
WOS记录号	WOS:000528208200002
WOS关键词	DRONNING-MAUD-LAND ; SOR RONDANE MOUNTAINS ; GRENVILLE-AGE METAMORPHISM ; AFRICAN OROGEN ; TECTONIC EVOLUTION ; MOZAMBIQUE BELT ; CENTRAL MADAGASCAR ; MAGMATIC HISTORY ; SOUTHERN AFRICA ; SRI-LANKA
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/2XILL650/319332
作者单位	1.Univ Bergen, Dept Earth Sci, PB 7803, N-5020 Bergen, Norway; 2.VNIIOkecmgeologia, Angliiskii Pr 1, St Petersburg 190121, Russia; 3.Fed Inst Geosci & Nat Resources BGR, Stilleweg 2, D-30655 Hannover, Germany; 4.Council Geosci, 3 Oos St, ZA-7535 Cape Town, South Africa; 5.Univ Johannesburg, Dept Geol, ZA-2006 Johannesburg, South Africa; 6.Russian Acad Sci, Inst Precambrian Geol & Geochronol, Makarova Emb 2, St Petersburg 199034, Russia; 7.St Petersburg Min Univ, 21 St Liniya 2, St Petersburg 199106, Russia; 8.Schubertstr 10, D-30900 Wedemark, Germany
推荐引用方式 GB/T 7714	Jacobs, J.,Mikhalsky, E.,Henjes-Kunst, F.,et al. Neoproterozoic geodynamic evolution of easternmost Kalahari: Constraints from U-Pb-Hf-O zircon, Sm-Nd isotope and geochemical data from the Schirmacher Oasis, East Antarctica[J],2020,342.
APA	Jacobs, J..,Mikhalsky, E..,Henjes-Kunst, F..,Laeufer, A..,Thomas, R. J..,...&Skublov, S..(2020).Neoproterozoic geodynamic evolution of easternmost Kalahari: Constraints from U-Pb-Hf-O zircon, Sm-Nd isotope and geochemical data from the Schirmacher Oasis, East Antarctica.PRECAMBRIAN RESEARCH,342.
MLA	Jacobs, J.,et al."Neoproterozoic geodynamic evolution of easternmost Kalahari: Constraints from U-Pb-Hf-O zircon, Sm-Nd isotope and geochemical data from the Schirmacher Oasis, East Antarctica".PRECAMBRIAN RESEARCH 342(2020).