Northwest Pacific-Izanagi plate tectonics since Cretaceous times from western Pacific mantle structure
Northwest Pacific-Izanagi subduction histories along Eurasia are poorly constrained due to extensive subduction, which partially consumed the western Pacific plate and the entire Izanagi plate, its hypothesized conjugate margin. Here we reconstruct NW Pacific-Izanagi plate tectonics since Cretaceous...
Published in: | Earth and Planetary Science Letters |
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ftunivwollongong:oai:ro.uow.edu.au:test2021-5136 2023-05-15T16:59:24+02:00 Northwest Pacific-Izanagi plate tectonics since Cretaceous times from western Pacific mantle structure Wu, Jonny Lin, Yi An Flament, Nicolas Wu, Jeremy Tsung Jui Liu, Yiduo 2022-01-01T08:00:00Z application/pdf https://ro.uow.edu.au/test2021/4127 https://ro.uow.edu.au/cgi/viewcontent.cgi?article=5136&context=test2021 unknown Research Online https://ro.uow.edu.au/test2021/4127 https://ro.uow.edu.au/cgi/viewcontent.cgi?article=5136&context=test2021 Test Series for Scopus Harvesting 2021 East Asia mantle structure Panthalassa plate tectonics seismic tomography western Pacific text 2022 ftunivwollongong 2022-09-05T22:23:30Z Northwest Pacific-Izanagi subduction histories along Eurasia are poorly constrained due to extensive subduction, which partially consumed the western Pacific plate and the entire Izanagi plate, its hypothesized conjugate margin. Here we reconstruct NW Pacific-Izanagi plate tectonics since Cretaceous times by mapping and structurally restoring (i.e. unfolding) the subducted western Pacific slabs from regional and global tomography, and re-creating the vanished Izanagi plate as its conjugate rift flank. Unfolding of the western Pacific slabs based on their cross-sectional areas, corrected for ‘tomographic smearing’, reveals that 2230 to 5000 km of western Pacific plate was subducted between Kamchatka and the southern Marianas. We add our restored western Pacific and Izanagi plates to a global plate model to reveal that Izanagi subduction under Eurasia after the mid-Cretaceous was limited between the present Bohai Bay-Yellow Sea, China, and northern Russia. The southern limit of Izanagi subduction was a NW-SE sinistral transform that intersected Eurasia near present Qingdao, China, and segmented eastern Eurasia continental magmatism during the late Cretaceous; we call this transform the ‘Qingdao line’. We reconstruct a low-angle Izanagi-Pacific ridge-trench intersection with Eurasia at ∼50 ± 10 Ma between Bohai Bay-Yellow Sea and northern Russia. The ∼50 Ma Pacific plate motion change initiated subduction along the Qingdao line transform, forming the Izu-Bonin-Marianas arcs and reorganizing the Bohai Bay-Yellow Sea faults. We show tomographic and geodynamic modeling evidence that a 4000 km-long, laterally-continuous, NE-SW trending, seismically-slow ‘slab gap’ at 1000 ± 250 km depth between present northern Sakhalin and central China is the tomographic signature of the subducted Izanagi-Pacific ridge. Text Kamchatka Sakhalin University of Wollongong, Australia: Research Online Pacific Earth and Planetary Science Letters 583 117445 |
institution |
Open Polar |
collection |
University of Wollongong, Australia: Research Online |
op_collection_id |
ftunivwollongong |
language |
unknown |
topic |
East Asia mantle structure Panthalassa plate tectonics seismic tomography western Pacific |
spellingShingle |
East Asia mantle structure Panthalassa plate tectonics seismic tomography western Pacific Wu, Jonny Lin, Yi An Flament, Nicolas Wu, Jeremy Tsung Jui Liu, Yiduo Northwest Pacific-Izanagi plate tectonics since Cretaceous times from western Pacific mantle structure |
topic_facet |
East Asia mantle structure Panthalassa plate tectonics seismic tomography western Pacific |
description |
Northwest Pacific-Izanagi subduction histories along Eurasia are poorly constrained due to extensive subduction, which partially consumed the western Pacific plate and the entire Izanagi plate, its hypothesized conjugate margin. Here we reconstruct NW Pacific-Izanagi plate tectonics since Cretaceous times by mapping and structurally restoring (i.e. unfolding) the subducted western Pacific slabs from regional and global tomography, and re-creating the vanished Izanagi plate as its conjugate rift flank. Unfolding of the western Pacific slabs based on their cross-sectional areas, corrected for ‘tomographic smearing’, reveals that 2230 to 5000 km of western Pacific plate was subducted between Kamchatka and the southern Marianas. We add our restored western Pacific and Izanagi plates to a global plate model to reveal that Izanagi subduction under Eurasia after the mid-Cretaceous was limited between the present Bohai Bay-Yellow Sea, China, and northern Russia. The southern limit of Izanagi subduction was a NW-SE sinistral transform that intersected Eurasia near present Qingdao, China, and segmented eastern Eurasia continental magmatism during the late Cretaceous; we call this transform the ‘Qingdao line’. We reconstruct a low-angle Izanagi-Pacific ridge-trench intersection with Eurasia at ∼50 ± 10 Ma between Bohai Bay-Yellow Sea and northern Russia. The ∼50 Ma Pacific plate motion change initiated subduction along the Qingdao line transform, forming the Izu-Bonin-Marianas arcs and reorganizing the Bohai Bay-Yellow Sea faults. We show tomographic and geodynamic modeling evidence that a 4000 km-long, laterally-continuous, NE-SW trending, seismically-slow ‘slab gap’ at 1000 ± 250 km depth between present northern Sakhalin and central China is the tomographic signature of the subducted Izanagi-Pacific ridge. |
format |
Text |
author |
Wu, Jonny Lin, Yi An Flament, Nicolas Wu, Jeremy Tsung Jui Liu, Yiduo |
author_facet |
Wu, Jonny Lin, Yi An Flament, Nicolas Wu, Jeremy Tsung Jui Liu, Yiduo |
author_sort |
Wu, Jonny |
title |
Northwest Pacific-Izanagi plate tectonics since Cretaceous times from western Pacific mantle structure |
title_short |
Northwest Pacific-Izanagi plate tectonics since Cretaceous times from western Pacific mantle structure |
title_full |
Northwest Pacific-Izanagi plate tectonics since Cretaceous times from western Pacific mantle structure |
title_fullStr |
Northwest Pacific-Izanagi plate tectonics since Cretaceous times from western Pacific mantle structure |
title_full_unstemmed |
Northwest Pacific-Izanagi plate tectonics since Cretaceous times from western Pacific mantle structure |
title_sort |
northwest pacific-izanagi plate tectonics since cretaceous times from western pacific mantle structure |
publisher |
Research Online |
publishDate |
2022 |
url |
https://ro.uow.edu.au/test2021/4127 https://ro.uow.edu.au/cgi/viewcontent.cgi?article=5136&context=test2021 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Kamchatka Sakhalin |
genre_facet |
Kamchatka Sakhalin |
op_source |
Test Series for Scopus Harvesting 2021 |
op_relation |
https://ro.uow.edu.au/test2021/4127 https://ro.uow.edu.au/cgi/viewcontent.cgi?article=5136&context=test2021 |
container_title |
Earth and Planetary Science Letters |
container_volume |
583 |
container_start_page |
117445 |
_version_ |
1766051661811286016 |