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Tectonic constraints on formation and evolution of microplates in the Indian and Pacific Oceans: reviews and statistical inferences

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dc.contributor.authorChoi, Hakkyum-
dc.contributor.authorKim, Seung-Sep-
dc.contributor.authorPark, Sung-Hyun-
dc.description.abstractOceanic plates are growing through narrow boundaries, such as mid-ocean ridges and transform faults. However, the discovery of diffuse plate boundary suggests another type of plate boundary that accommodates difference in plate motion via internal deformation. Along the Central and Southeast Indian ridges, for example, the Capricorn and Macquarie microplates exhibit widespread diffuse boundaries and hence divide the Indo-Australian Plate further into the Indian, Australian, Capricorn, and Macquarie plates. As for microplates distributed along the East Pacific Rise and Pacific-Antarctic Ridge in the Pacific Ocean, however, the typical plate boundaries surrounding the given microplate are distinctly established. Global plate reorganization involving the changes in plate motion or in spreading direction can be accommodated by forming a microplate through ridge extinction, ridge propagation, and pseudofault formation. However, relations between these tectonic processes have not been quantitatively assessed. In particular, we aim to examine tectonic constrains on the formation processes of microplates with diffuse plate boundary. In this study, we compare plate size, plate age, full-spreading rates, thermal structures, total rotation, and rotation rate for the 9 microplates including extinct plates (i.e., Capricorn, Macquarie, and Mammerickx* microplates in the Indian and Southern Oceans; Galapagos, Easter, Juan Fernandez, Bauer*, Friday*, and Selkirk* microplates in the Pacific Ocean; extinct plates are denoted with asterisks). From this comparison, we find that the microplate formation would require certain tectonic conditions (e.g., full-spreading rates faster than 70-80 mm/yr and rotation rates faster than 5-6 degrees/m.y.) to evolve into an independent and rigid plate with respect to the neighboring plates. If the conditions are not met, the same tectonic reorganization would result in a microplate with diffuse plate boundaries.en_US
dc.titleTectonic constraints on formation and evolution of microplates in the Indian and Pacific Oceans: reviews and statistical inferencesen_US
dc.title.alternative마이크로판의 형성과 진화에 대한 판구조적 조건: 리뷰 및 통계적 추론en_US
dc.identifier.bibliographicCitationChoi, Hakkyum, Kim, Seung-Sep, Park, Sung-Hyun. 2021. "Tectonic constraints on formation and evolution of microplates in the Indian and Pacific Oceans: reviews and statistical inferences". <em>Geosciences Journal</em>, 25(6): 799-811.-
dc.citation.titleGeosciences Journalen_US
dc.description.jcrRateJCR 2019:65.5en_US
dc.subject.keywordridge propagationen_US
dc.subject.keyworddiffuse plate boundaryen_US
dc.subject.keywordplate reorganizationen_US
Appears in Collections  
2021-2021, Mantle dynamics and tectonic evolutions of Zealandia-Antarctic domain (21-21) / Park, Sung Hyun (PE21050)
2020-2020, Characterization and origin of the Zealandia-Antarctic mantle (20-20) / Park, Sung Hyun (PE20210)
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