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Plume‐Induced Sinking of Intracontinental Lithospheric Mantle: An Overlooked Mechanism of Subduction Initiation?

Cloetingh, Sierd; Koptev, Alexander; Kovács, István; Gerya, Taras; Beniest, Anouk; Willingshofer, Ernst; Ehlers, Todd A.; Andrić‐Tomašević, Nevena; Botsyun, Svetlana; Eizenhöfer, Paul R.; François, Thomas; Beekman, Fred

Abstract (englisch):
Although many different mechanisms for subduction initiation have been proposed, only few of them are viable in terms of consistency with observations and reproducibility in numerical experiments. In particular, it has recently been demonstrated that intra-oceanic subduction triggered by an upwelling mantle plume could greatly contribute to the onset and operation of plate tectonics in the early and, to a lesser degree, modern Earth. On the contrary, the initiation of intra-continental subduction still remains underappreciated. Here we provide an overview of 1) observational evidence for upwelling of hot mantle material flanked by downgoing proto-slabs of sinking continental mantle lithosphere, and 2) previously published and new numerical models of plume-induced subduction initiation. Numerical modeling shows that under the condition of a sufficiently thick (>100 km) continental plate, incipient downthrusting at the level of the lowermost lithospheric mantle can be triggered by plume anomalies of moderate temperatures and without significant strain- and/or melt-related weakening of overlying rocks. This finding is in contrast with the requirements for plume-induced subduction initiation within oceanic or thinner continental lithosphere. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000140035
Veröffentlicht am 16.11.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 02.2021
Sprache Englisch
Identifikator ISSN: 1525-2027, 1525-2027
KITopen-ID: 1000140035
Erschienen in Geochemistry, geophysics, geosystems
Verlag John Wiley and Sons
Band 22
Heft 2
Seiten e2020GC009482
Vorab online veröffentlicht am 20.01.2021
Nachgewiesen in Web of Science
Scopus
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