Multiple mantle sources of continental magmatism: Insights from “high-Ti” picrites of Karoo and other large igneous provinces

Magmas forming large igneous provinces (LIP) on continents are generated by extensive melting in the deep crust and underlying mantle and associated with break-up of ancient supercontinents, followed by formation of a new basaltic crust in the mid-oceanic rifts. A lack of the unifying model in under...

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Bibliographic Details
Published in:Chemical geology 2017-04, Vol.455, p.22-31
Main Authors: Kamenetsky, Vadim S., Maas, Roland, Kamenetsky, Maya B., Yaxley, Gregory M., Ehrig, Kathy, Zellmer, Georg F., Bindeman, Ilya N., Sobolev, Alexander V., Kuzmin, Dmitry V., Ivanov, Alexei V., Woodhead, Jon, Schilling, Jean-Guy
Format: Article
Language:English
Subjects:
Cr-spinel
Karoo
Large igneous provinces
Magmatism
Melt inclusions
Olivine
Picrites
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Summary:Magmas forming large igneous provinces (LIP) on continents are generated by extensive melting in the deep crust and underlying mantle and associated with break-up of ancient supercontinents, followed by formation of a new basaltic crust in the mid-oceanic rifts. A lack of the unifying model in understanding the sources of LIP magmatism is justified by lithological and geochemical complexity of erupted magmas on local (e.g. a cross-section) and regional (a single and different LIP) scales. Moreover, the majority of LIP rocks do not fit general criteria for recognizing primary/primitive melts (i.e.
ISSN:0009-2541
1872-6836
DOI:10.1016/j.chemgeo.2016.08.034