Subduction polarity reversal: Difference between revisions

Revision as of 09:20, 9 February 2023

Revision as of 12:56, 14 July 2023

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# Subduction system ceases with the involvement of continental plate

# Old slab breaks off<ref name=":113" /><ref name=":132222" />

In addition to the criteria for the occurrence of subduction polarity reversal, some geologists have attempted to define controls of this phenomenon’s initiation. Zhang proposes that “the plastic strength and age of the overriding oceanic plate in the arc-continent collision system control the initiation modes.” When the whole overriding oceanic plate has a small plastic strength and younger oceanic plate it prefers a “spontaneous subduction polarity reversal”.<ref>Zhang, S., & Leng, W. (2021). Subduction polarity reversal: Induced or spontaneous? Geophysical Research Letters, 48, e2021GL093201. <nowiki>https://doi</nowiki> . org/10.1029/2021GL093201</ref> This is because the lack in plastic strength allows negative buoyancy to overcome and “spontaneously initiate” subduction. while the stronger plastic strength and older oceanic plate prefers an “induced subduction polarity reversal. This is because the stronger plastic strength in the oceanic plate, the more it will resist a “spontaneous subduction”, making it necessary for a compression induced subduction polarity reversal.

Different models representing the subduction polarity reversal depends highly on parameters the Geologists considered. Here is the summary table showing the comparison models.