NW Pacific-Eurasia Subduction History and Continental Arc Evolution along NE Asia since Cretaceous Times

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dc.contributor.advisorWu, Jonny
dc.contributor.committeeMemberCasey, John F.
dc.contributor.committeeMemberLapen, Thomas J.
dc.contributor.committeeMemberOkamoto, Kazuaki
dc.creatorWu, Tsung Jui
dc.creator.orcid0000-0002-6995-6241
dc.date.accessioned2022-06-17T22:10:26Z
dc.date.createdDecember 2021
dc.date.issued2021-12
dc.date.submittedDecember 2021
dc.date.updated2022-06-17T22:10:27Z
dc.description.abstractThe Eurasian continental margin of NE Asia records abundant Mesozoic to present igneous activity in response to Pacific and Panthalassa (paleo-Pacific) subduction. Plate tectonic studies typically reconstruct long-lived plate convergence involving subduction of the Panthalassa/Pacific plates since 200 Ma. However, many first-order details of NW Panthalassa plate tectonic reconstructions remain controversial, including ridge-trench intersections and intra-oceanic arc accretions along Eurasia since the Early Cretaceous. In this dissertation, we investigate the Mesozoic to Cenozoic magmatic and plate tectonic history of the 31-52 N NE Asian continental active margin (Japan, Korea, NE China, and southern Russian Far East). We analyze igneous rock U-Pb geochronology and geochemistry (n=92) of Sikhote-Alin, Russia and add published data (n>800) to create a large regional magmatic database that is compared to published structural geology, stratigraphy, paleomagnetism, and an unpublished fully-kinematic ‘tomographic’ NE Asian-Pacific plate tectonic reconstruction. I show the following plate tectonic stages along NE Asia since the Cretaceous: (1) subduction of one or more marginal sea plates during the Early Cretaceous; (2) a ~130-100 Ma intra-oceanic arc accretion event that shows magmatism from subducted-slab melting; (3) ~100-50 Ma Izanagi slab subduction correlated to higher magmatic fluxes (up to 1000 km2 /Myr), high % SiO2 (mean 66-70 %), and enriched Nd(t) isotopic ratios (-15 to +2), that link to ultrafast subduction (12 to 24 cm/yr); (4) ~50 Ma Pacific-Izanagi spreading ridge subduction based on a 56-46 Ma arc magmatic hiatus; and. (5) ~50-0 Ma slower (2 to 8 cm/yr) Pacific plate subduction correlated to lower magmatic flux (~ 400 km2 /Myr), SiO2 (mean 56-63 %), and more depleted Nd(t) isotopic ratios (-5 to +10). Migration of the NE Asian continental arc ~2000 km outboard (eastward) since Jurassic times indicates continental growth within an accretionary orogen that is driven by long-lived ocean-continent subduction.
dc.description.departmentEarth and Atmospheric Sciences, Department of
dc.format.digitalOriginborn digital
dc.format.mimetypeapplication/pdf
dc.identifier.citationPortions of this document appear in: Wu, J. T. J., & Wu, J. (2019). Izanagi-Pacific ridge subduction revealed by a 56 to 46 Ma magmatic gap along the northeast Asian margin. Geology, 47(10), 953-957.
dc.identifier.urihttps://hdl.handle.net/10657/9273
dc.language.isoeng
dc.rightsThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. UH Libraries has secured permission to reproduce any and all previously published materials contained in the work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).
dc.subjectnorthwest Pacific
dc.subjectnortheast Asia
dc.subjectIzanagi plate
dc.subjectPacific plate
dc.subjectPanthalassa
dc.subjectplate tectonics
dc.subjectplate reconstruction
dc.subjectcontinental arc
dc.subjectsubduction
dc.subjectnorth China
dc.subjectJapan
dc.subjectKorea
dc.subjectSikhote-Alin
dc.subjectarc tempos
dc.titleNW Pacific-Eurasia Subduction History and Continental Arc Evolution along NE Asia since Cretaceous Times
dc.type.dcmiText
dc.type.genreThesis
dcterms.accessRightsThe full text of this item is not available at this time because the student has placed this item under an embargo for a period of time. The Libraries are not authorized to provide a copy of this work during the embargo period.
local.embargo.lift2023-12-01
local.embargo.terms2023-12-01
thesis.degree.collegeCollege of Natural Sciences and Mathematics
thesis.degree.departmentEarth and Atmospheric Sciences, Department of
thesis.degree.disciplineGeology
thesis.degree.grantorUniversity of Houston
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy

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Appendix D Whole-rock geochemical result of SIkhote-Alin igneous rocks.xlsx
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Appendix C New zircon U-Pb age result of Sikhote-Alin igneous rocks.xlsx
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Appendix B Data and reference of the early Cretaceous adakitic rocks in NE Asia.xlsx
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Appendix A Compiled published age and Nd-Sr isotopic composition of late Cretaceous to Cenozoic NE Asia igneous rock.xlsx
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