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Joint geodynamic-geophysical inversion reveals passive subduction and accretion of the Ontong Java Plateau
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  • Hao Dong,
  • Liming Dai,
  • Lijun Liu,
  • Xiaodian Jiang,
  • Sanzhong Li,
  • Wei Gong,
  • Liangliang wang,
  • Di Wang,
  • Zhong-Hai Li,
  • Shengyao Yu
Hao Dong
Ocean University of China
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Liming Dai
Ocean University of China

Corresponding Author:[email protected]

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Lijun Liu
University of Illinois at Urbana Champaign
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Xiaodian Jiang
Ocean University of China
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Sanzhong Li
Ocean University of China
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Wei Gong
Ocean University of China
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Liangliang wang
Ocean University of China
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Di Wang
Ocean University of China
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Zhong-Hai Li
University of Chinese Academy of Sciences
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Shengyao Yu
Ocean University of China
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Abstract

In this study, we for the first time applied a joint geodynamic-geophysical inversion (JGGI) approach to oceanic plateau subduction models, and compared the subduction style and corresponding topography and Bouguer gravity of two representative subduction scenarios with passive or active collision. We showed that the case of passive collision of the Ontong Java Plateau (OJP) crust better explains the topography, gravity, and seismic data than the active collision scenario. This implies that the OJP did not control the regional dynamics during the collisional process. We conclude that previous studies may have overestimated the role of the OJP in triggering subduction initiation, subduction polarity reversal, and even Pacific Plate rotation.