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Identification of a...
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Kingsbury, Cole G.University of Pretoria,Tomsk State University
(författare)
Identification of a new 485 Ma post-orogenic mafic dyke swarm east of the Pan-African Saldania-Gariep Belt of South Africa
- Artikel/kapitelEngelska2021
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Nummerbeteckningar
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LIBRIS-ID:oai:lup.lub.lu.se:b3db445a-5ce2-4f64-93c6-2b2871d1c2d5
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https://lup.lub.lu.se/record/b3db445a-5ce2-4f64-93c6-2b2871d1c2d5URI
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https://doi.org/10.1016/j.precamres.2020.106043DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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Ämneskategori:ref swepub-contenttype
Anmärkningar
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Western South Africa between Cape Town and the Namibian border hosts many dyke swarms that strike broadly to the NW and NNW, towards the reconstructed plume-centre of the c. 130 Ma Parana-Etendeka Large Igneous Province (LIP) but are undated. U-Pb ID-TIMS age determinations on baddeleyite from two NNW-striking dykes (~100 km long) parallel to the Namaqualand coast yield 487 ± 8 Ma and 482 ± 7 Ma as age determinations. These results demonstrate that these two dykes represent a magmatic event independent of, and significantly older than the Parana-Etendeka LIP with which they had previously been correlated. Major and trace element compositions are uniform along-these two dykes but distinct from each other; each is inferred to be fed by different magma batches. The inland Garies dyke has the stronger asthenospheric signature, comparable to E-MORBs, while the Namaqualand dyke has a lithospheric overprint, which could have been derived from a metasomatised sub-continental lithospheric mantle and/or assimilation of upper continental crust. The magmatism coincides with a tectonic shift from the compressional Pan-African Saldania-Gariep orogeny to a pull-apart rift system hosting Klipheuwel-Piekenierskloof deposits. This magmatism could potentially be the remnant of a hitherto unrecognized LIP. Within uncertainty, the 485 Ma timing overlaps with the end of the Cambrian period.
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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Klausen, Martin B.Stellenbosch University
(författare)
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Söderlund, UlfLund University,Lunds universitet,Berggrundsgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Lithosphere and Biosphere Science,Department of Geology,Faculty of Science(Swepub:lu)geol-uso
(författare)
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Altermann, WladyslawUniversity of Johannesburg
(författare)
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Ernst, Richard E.Carleton University,Tomsk State University
(författare)
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University of PretoriaTomsk State University
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Precambrian Research: Elsevier BV3540301-9268
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