Magmatic flare-up causes crustal thickening at the transition from subduction to continental collision

Ganade, Carlos E.; Lanari, Pierre; Rubatto, Daniela; Hermann, Jörg; Weinberg, Roberto F.; Basei, Miguel A. S.; Tesser, Lucas R.; Caby, Renaud; Agbossoumondé, Yao; Ribeiro, Caroline (2021). Magmatic flare-up causes crustal thickening at the transition from subduction to continental collision. Communications earth & environment, 2(1) Springer Nature 10.1038/s43247-021-00103-z

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Above subduction zones, magma production rate and crustal generation can increase by an order of magnitude during narrow time intervals known as magmatic flare-ups. However, the consequences of these events in the deep arc environment remain poorly understood. Here we use petrological and in-situ zircon dating techniques to investigate the root of a continental arc within the collisional West Gondwana Orogen that is now exposed in the Kabyé Massif, Togo. We show that gabbros intruded 670 million years ago at 20–25 km depth were transformed to eclogites by 620 million years ago at 65–70 km depth. This was coeval with extensive magmatism at 20–40 km depth, indicative of a flare-up event which peaked just prior to the subduction of the continental margin. We propose that increased H2O flux from subduction of serpentinized mantle in the hyper-extended margin of the approaching continent was responsible for the increased magma productivity and crustal thickening.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geological Sciences > Isotope Geology

UniBE Contributor:

Ganade De Araujo, Carlos Eduardo; Lanari, Pierre; Rubatto, Daniela and Hermann, Jörg

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

2662-4435

Publisher:

Springer Nature

Funders:

[4] Swiss National Science Foundation

Projects:

[UNSPECIFIED] U-Pb petrochronology applied to hot shear zones in NE-Brazil

Language:

English

Submitter:

Daniela Rubatto

Date Deposited:

11 Feb 2021 11:47

Last Modified:

26 Feb 2021 10:32

Publisher DOI:

10.1038/s43247-021-00103-z

BORIS DOI:

10.48350/150427

URI:

https://boris.unibe.ch/id/eprint/150427

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