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The kinematic evolution of the Macquarie Plate: A case study for the fragmentation of oceanic lithosphere

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Title
The kinematic evolution of the Macquarie Plate: A case study for the fragmentation of oceanic lithosphere
Other Titles
남극중앙해령 지자기 연구에 기초한 맥쿼리판의 생성 및 판구조적 운동 복원
Authors
Choi, Hakkyum
Hong, Jong Kuk
Park, Sung Hyun
Roi Granot
Jerome Dyment
Kim, Seung-Sep
Subject
Geochemistry & Geophysics
Keywords
Macquarie Plate; marine magnetics; plate reconstruction; tectonics
Issue Date
2017
Citation
Choi, Hakkyum, et al. 2017. "The kinematic evolution of the Macquarie Plate: A case study for the fragmentation of oceanic lithosphere". EARTH AND PLANETARY SCIENCE LETTERS, 478(1): 132-142.
Abstract
The tectonic evolution of the Southeast Indian Ridge (SEIR), and in particular of its easternmost edge, has not been constrained by high-resolution shipboard data and therefore the kinematic details of its behavior are uncertain. Using new shipboard magnetic data obtained by R/VIB Araonand M/V L’Astrolabealong the easternmost SEIR and available archived magnetic data, we estimated the finite rotation parameters of the Macquarie-Antarctic and Australian-Antarctic motions for eight anomalies (1o, 2, 2Ay, 2Ao, 3y, 3o, 3Ay, and 3Ao). These new finite rotations indicate that the Macquarie Plate since its creation ∼6.24 million years ago behaved as an independent and rigid plate, confirming previous estimates. The change in the Australian?Antarctic spreading direction from N?S to NW?SE appears to coincide with the formation of the Macquarie Plate at ∼6.24 Ma. Analysis of the estimated plate motions indicates that the initiation and growth stages of the Macquarie Plate resemble the kinematic evolution of other microplates and continental breakup, whereby a rapid acceleration in angular velocity took place after its initial formation, followed by a slow decay, suggesting that a decrease in the resistive strength force might have played a significant role in the kinematic evolution of the microplate. The motions of the Macquarie Plate during its growth stages may have been further enhanced by the increased subducting rates along the Hjort Trench, while the Macquarie Plate has exhibited constant growth by seafloor spreading.
URI
http://repository.kopri.re.kr/handle/201206/6256
DOI
http://dx.doi.org/10.1016/j.epsl.2017.08.035
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