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

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 sub...

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Bibliographic Details
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
Description
Summary: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.

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