Styles of Trench-Parallel Mid-Ocean Ridge Subduction Affect Cenozoic Geological Evolution in Circum-Pacific Continental Margins

• Published in: Geophysical Research Letters
• Main Authors: Wu, Yangming, Liao, Jie, Guo, Feng, Wang, Xuan-Ce, Shen, Yongqiang
• Format: Report
• Language: English
• Published: AMER GEOPHYSICAL UNION 2022
• Subjects: Geology; subduction; mid-ocean ridge; slab dips; numerical modeling; Geosciences; Multidisciplinary; RUSSIAN FAR-EAST; ALIN OROGENIC BELT; SHIMANTO ACCRETIONARY COMPLEX; ACTIVE SPREADING RIDGE; SLAB WINDOW MAGMAS; LAGO BUENOS-AIRES; CRUSTAL GROWTH; SOUTH-AMERICA; ALKALINE VOLCANISM; BAJA-CALIFORNIA; Antarctic; Baja; Pacific; Antarc*
• Online Access: http://ir.gig.ac.cn/handle/344008/67737; https://doi.org/10.1029/2022GL098428

Distinct signatures are present in the circum-Pacific continental margins (e.g., kinematics, magmatism, and basin evolution), possibly influenced by the input of mid-ocean ridge. It remains enigmatic why the circum-Pacific continental margins that have experienced trench-parallel mid-ocean ridge subduction show diverse geological evolution. Here we present geodynamic modeling results investigating trench-parallel mid-ocean ridge subduction and demonstrate two distinct types of model evolution. Type-I model includes a two-stage steep subduction and is featured by slab detachment preceding the arrival of ridge at the trench. Type-II model is marked by a continuous flat subduction of mid-ocean ridge with the opening of a slab window beneath intracontinental lithosphere. These two subduction styles produce diverse tectono-magmatic responses. Our results could explain the magmatic gap and forearc uplift during the Izanagi-Pacific ridge subduction and the intraplate magmatic flare-ups and tectonic uplift during the Nazca-Antarctic ridge subduction, respectively.