Deciphering Subduction Polarity During Ancient Arc‐Continent Collisions

Author:

Yan Zhiyong1ORCID,Chen Lin1ORCID,Zuza Andrew V.2ORCID,Xiang Xiao13ORCID,Xie Renxian4ORCID,Ai Sanxi5ORCID

Affiliation:

1. State Key Laboratory of Lithospheric and Environmental Coevolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China

2. Nevada Bureau of Mines and Geology Nevada Geosciences University of Nevada Reno NV USA

3. College of Earth and Planetary Sciences University of Chinese Academy of Sciences Beijing China

4. School of Transportation Engineering East China Jiaotong University Nanchang China

5. Hubei Subsurface Multi‐Scale Imaging Key Laboratory School of Geophysics and Geomatics China University of Geosciences Wuhan China

Abstract

AbstractThe closure of an ancient ocean basin via oceanic arc‐continent collision has two subduction styles with opposite polarities, which may proceed via subduction polarity reversal (SPR) or a subduction zone jump (SZJ). Interpreting the geometry or kinematic evolution of ancient collisional zones, especially the original subduction polarity, can be challenging. Here we used 2D thermo‐mechanical modeling to investigate the dynamic evolution process of SPR versus SZJ. Our modeling predicts different structural, topographic, magmatic, and basin histories for SPR and SZJ, which can be compared against, and help interpret, the geologic record past sites of oceanic closure during collisional orogens. Our results match geologic observations of past collisions in Kamchatka, eastern Russia, and the Banda Arc, eastern Indonesia, and thus our results can help effectively decode the evolutionary history of past arc‐continent collisions.

Funder

National Natural Science Foundation of China

Publisher

American Geophysical Union (AGU)

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