NW Pacific‐Panthalassa Intra‐Oceanic Subduction During Mesozoic Times From Mantle Convection and Geoid Models
NW Pacific‐Panthalassa Intra‐Oceanic Subduction During Mesozoic Times From Mantle Convection and Geoid Models
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DOI：
10.1029/2022gc010514
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发表时间：
2021-04
期刊：
影响因子：
3.7
通讯作者：
Yi-An Lin;L. Colli;Jonny Wu
中科院分区：
文献类型：
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作者：
Yi-An Lin;L. Colli;Jonny Wu
由于广泛的俯冲作用，太平洋-泛海底板块构造是地球上在中生代和新生代重建最具挑战性的板块构造，这导致太平洋和劳亚大陆（现在的东北亚洲）之间出现了巨大的（> 9，000公里长）不受约束的间隙。早侏罗世。我们建立了四个对比的西北太平洋-泛地中海全球板块重建和同化到全球地球动力学模型的速度场。我们比较我们预测的地幔结构，合成大地水准面和动态地形地球观测。预测地幔结构的P波层析滤波允许与全球层析成像进行更明确的比较。包括西北太平洋-泛海拉萨洋内俯冲在内的板块重建更符合观测到的大地水准面和残留地形，挑战了沿着东亚安第斯式俯冲的流行模型。我们的地球动力学模型预测了西北太平洋盆地下地幔（从中生代至今约2,500公里）内显著的东南向横向板块平流，这将混淆成像板块和过去俯冲带位置的“垂直板块下沉”式解释。
Pacific‐Panthalassa plate tectonics are the most challenging on Earth to reconstruct during the Mesozoic and Cenozoic eras due to extensive subduction, which has resulted in large (>9,000 km length) unconstrained gaps between the Pacific and Laurasia (now NE Asia) back to the Early Jurassic. We build four contrasted NW Pacific‐Panthalassa global plate reconstructions and assimilate their velocity fields into global geodynamic models. We compare our predicted present mantle structure, synthetic geoid and dynamic topography to Earth observations. P‐wave tomographic filtering of predicted mantle structures allows for more explicit comparisons to global tomography. Plate reconstructions that include intra‐oceanic subduction in NW Pacific‐Panthalassa fit better to the observed geoid and residual topography, challenging popular models of Andean‐style subduction along East Asia. Our geodynamic models predict significant SE‐ward lateral slab advections within the NW Pacific basin lower mantle (∼2,500 km from Mesozoic times to present) that would confound “vertical slab sinking”‐style restorations of imaged slabs and past subduction zone locations.