Multiple Slabs and Complex Mantle Flows in the Molucca Sea Subduction Zone

IF 2.9 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Geochemistry Geophysics Geosystems Pub Date : 2024-08-13 DOI:10.1029/2024GC011500
Tianmeng Yuan, Zewei Wang, Dapeng Zhao, Rui Gao, Xiaofei Chen
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Abstract

The Molucca Sea subduction zone is unique for its active divergent double-subducted slab located in the north of the Java and Banda subduction zones. The spatial proximity of these subduction zones would cause a complex mantle flow field. To clarify the mantle dynamics, here we present P-wave tilting-axis anisotropic tomography obtained by inverting a large number of local and teleseismic travel-time data recorded at 254 seismic stations in eastern Southeast Asia. Our results suggest that the mantle structure and dynamics of the western Molucca Sea subduction zone may be remotely controlled by the Java and Banda subduction zones. Mantle convection in the big mantle wedge west of the Molucca Sea subduction zone is possibly influenced by east-west mantle flow associated with compression of the Indo-Australian slab as well as north-south mantle flow related to rollback of the Indo-Australian slab. In contrast, the eastern Molucca Sea subduction zone is virtually unaffected by other subduction zones, probably due to the ongoing slab subduction there.

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摩鹿加海俯冲带的多板块和复杂地幔流
摩鹿加海俯冲带位于爪哇岛和班达岛俯冲带的北部,是一个独特的活跃发散双俯冲板块。这些俯冲带在空间上的接近会造成复杂的地幔流场。为了阐明地幔动力学,我们在此介绍了通过反演东南亚东部 254 个地震台站记录的大量本地和远震走时数据而获得的 P 波倾轴各向异性层析成像。我们的研究结果表明,摩鹿加海西俯冲带的地幔结构和动力学可能受到爪哇和班达俯冲带的遥控。摩鹿加海俯冲带西部大地幔楔中的地幔对流可能受到与印澳板块压缩有关的东西向地幔流以及与印澳板块回滚有关的南北向地幔流的影响。相比之下,摩鹿加海东部俯冲带几乎不受其他俯冲带的影响,这可能是由于那里正在进行板块俯冲。
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来源期刊
Geochemistry Geophysics Geosystems
Geochemistry Geophysics Geosystems 地学-地球化学与地球物理
CiteScore
5.90
自引率
11.40%
发文量
252
审稿时长
1 months
期刊介绍: Geochemistry, Geophysics, Geosystems (G3) publishes research papers on Earth and planetary processes with a focus on understanding the Earth as a system. Observational, experimental, and theoretical investigations of the solid Earth, hydrosphere, atmosphere, biosphere, and solar system at all spatial and temporal scales are welcome. Articles should be of broad interest, and interdisciplinary approaches are encouraged. Areas of interest for this peer-reviewed journal include, but are not limited to: The physics and chemistry of the Earth, including its structure, composition, physical properties, dynamics, and evolution Principles and applications of geochemical proxies to studies of Earth history The physical properties, composition, and temporal evolution of the Earth''s major reservoirs and the coupling between them The dynamics of geochemical and biogeochemical cycles at all spatial and temporal scales Physical and cosmochemical constraints on the composition, origin, and evolution of the Earth and other terrestrial planets The chemistry and physics of solar system materials that are relevant to the formation, evolution, and current state of the Earth and the planets Advances in modeling, observation, and experimentation that are of widespread interest in the geosciences.
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