Geologic and kinematic constraints on Late Cretaceous to mid Eocene plate boundaries in the southwest Pacific
作者： Kara J. Matthews , Simon E. Williams , Joanne M. Whittaker , R. Dietmar Müller , Maria Seton
DOI: 10.1016/J.EARSCIREV.2014.10.008
关键词: Pacific Plate 、 Rift 、 Back-arc basin 、 Subduction 、 Paleontology 、 Plate tectonics 、 Cretaceous 、 Tectonics 、 Convergent boundary 、 Geology
摘要: Abstract Starkly contrasting tectonic reconstructions have been proposed for the Late Cretaceous to mid Eocene (~ 85–45 Ma) evolution of southwest Pacific, reflecting sparse and ambiguous data. Furthermore, uncertainty in timing motion at plate boundaries region has led controversy around how implement a robust Pacific circuit. It is agreed that comprised three spreading ridges during this time: Southeast Indian Ocean, Tasman Sea Amundsen Sea. However, one possibly two other also accommodated relative motions: West Antarctic Rift System (WARS) between Lord Howe Rise (LHR) Pacific. Relevant geologic kinematic data from are reviewed better constrain its history period, determine time-dependent regional A model (1) west-dipping subduction basin opening east LHR 85–55 Ma, (2) initiation northeast-dipping closure New Caledonia ~ 55 Ma supported. West-dipping were not driven by convergence, as previously proposed. Our circuit analysis suggests least 74 Ma there was little net LHR,
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