Bilateral geochemical asymmetry in the Karoo large igneous province

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http://hdl.handle.net/10138/234192

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Luttinen , A V 2018 , ' Bilateral geochemical asymmetry in the Karoo large igneous province ' , Scientific Reports , vol. 8 , no. 8 , 5223 . https://doi.org/10.1038/s41598-018-23661-3

Title: Bilateral geochemical asymmetry in the Karoo large igneous province
Author: Luttinen, Arto V.
Contributor: University of Helsinki, Natural Sciences Unit
Date: 2018-03-27
Language: eng
Number of pages: 11
Belongs to series: Scientific Reports
ISSN: 2045-2322
URI: http://hdl.handle.net/10138/234192
Abstract: In the Karoo large igneous province, the geochemical assessment of mantle source variability and structure is hampered by probable crustal contamination overprinting of compositionally diverse flood basalts. Mantle source characteristics have been defined only for exceptional, primitive rock types. Here I use a compiled dataset for over 800 samples to demonstrate that the abundance of Nb relative to Zr, Ti, and Y provides a useful geochemical tracer of mantle sources for variably contaminated rock types of the Karoo province. Variations in the relative abundance of Nb reveal emplacement of distinctive, Nb-undepleted and Nb-depleted magmas in the North Karoo and South Karoo sub-provinces, respectively, and clarify correlation between flood basalts and previously proposed mantle source components. Judging from plate tectonic reconstructions and the compositions of plausible mantle source components, the geochemical bilateral asymmetry in Karoo may reflect tapping of contrasting plume and upper mantle reservoirs in the two sub-provinces.
Subject: 1171 Geosciences
DRONNING MAUD LAND
CONTINENTAL FLOOD BASALTS
TRACE-ELEMENT COMPOSITION
CORE-MANTLE BOUNDARY
SOUTH-AFRICA
GONDWANA BREAKUP
PICRITE BASALTS
OCEANIC-CRUST
DEEP-MANTLE
MAGMA TYPES
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