The Beginning of a Wilson Cycle in an Accretionary Orogen. The Mongol–Okhotsk Ocean Opened Assisted by a Devonian Mantle Plume

Early Devonian global plate tectonic map and paleolatitudes of the Amur Block and Siberia Craton


The opening of oceans within accretionary orogens is important for understanding the Wilson cycle. The Mongol–Okhotsk Ocean (MOO) began opening within the early Paleozoic accretionary collage of the Central Asian Orogenic Belt (CAOB), representing a world-class example to constrain the geodynamic history of ocean opening in accretionary orogens, but the kinematics and mechanisms associated to this process are highly debated. We report on a newly-discovered bimodal volcanic suite and associated volcanic-sediments that comprise part of the Altay-Sayan Rift System, which indicate a widespread Early Devonian extensional event within the CAOB. This extension regime is attributed to a Devonian mantle plume, which is thought to have impinged upon and weakened the lithosphere of the Early Paleozoic collage, and drove the opening of the MOO. Opening of the MOO suggests continent breakup in accretionary orogens tends to focus along intervening weak orogenic lithosphere between the rigid microcontinents.

GeophysicalResearchLetters,51,e2024GL109028, DOI: 10.1029/2024GL109028
Daniel Pastor-Galán
Daniel Pastor-Galán
Científico Titular and Assistant Professor (助教) of Tectonics

My research interests include plate tectonics, paleogeogrphy and geodynamics.