Does tectonic deformation control episodic continental arc magmatism? Evidence from granitic magnetic fabrics (AMS)

نویسندگان

چکیده

This paper applies magnetic fabric analyses to plutons of the East Pacific continental arc. Continental arc magmatism is strongly episodic, with voluminous granitic magma addition occurring during discrete high-flux events (‘flare-ups’). The cause these flare-ups debated, variously invoking tectonic, mantle, or crustal controls. To understand how syn-magmatic strain history changes a flare-up, we compare (Anisotropy Magnetic Susceptibility, AMS) and geochronological data from Antarctic Peninsula (Lassiter Coast), Sierra Nevada, Chile. comparison indicates common pattern in orientation magnitude deformation, showing flare-up occur increased tectonic compression driven by enhanced interplate coupling fast subduction. Flare-ups terminate as reduces regime becomes extensional, even if convergence rates remain high. As seismicity, magmatic result high compression, periods within broader subduction rates. flux results either thickening leading partial melting newly accreted, hydrous mafic underplate, melt segregation source, response rendering lithostatic weakest compressive force, enhancing extraction ascent mantle.

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ژورنال

عنوان ژورنال: Gondwana Research

سال: 2022

ISSN: ['1342-937X', '1878-0571']

DOI: https://doi.org/10.1016/j.gr.2022.09.006