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Origin of the Tongbai-Dabie-Sulu Neoproterozoic low-d18O igneous province, east-central China

Fu, Bin; Kita, Noriko T; Wilde, Simon; Liu, Xiaochun; Cliff, John; Greig, Alan

Description

Zircons from 71 diverse rocks from the Qinling-Tongbai-Dabie-Sulu orogenic belt in east-central China and, for comparison, eight from adjoining areas in the South China and North China blocks, have been analyzed for in situ 18O/16O ratio and/or U-Pb age to further constrain the spatial distribution and genesis of Neoproterozoic low-δ18O magmas, that is, δ18O(zircon) ≤4 ‰ VSMOW. In many metaigneous rock samples from Tongbai-Dabie-Sulu, including high-pressure and ultrahigh-pressure eclogites and...[Show more]

dc.contributor.authorFu, Bin
dc.contributor.authorKita, Noriko T
dc.contributor.authorWilde, Simon
dc.contributor.authorLiu, Xiaochun
dc.contributor.authorCliff, John
dc.contributor.authorGreig, Alan
dc.date.accessioned2015-12-10T22:36:16Z
dc.identifier.issn0010-7999
dc.identifier.urihttp://hdl.handle.net/1885/56617
dc.description.abstractZircons from 71 diverse rocks from the Qinling-Tongbai-Dabie-Sulu orogenic belt in east-central China and, for comparison, eight from adjoining areas in the South China and North China blocks, have been analyzed for in situ 18O/16O ratio and/or U-Pb age to further constrain the spatial distribution and genesis of Neoproterozoic low-δ18O magmas, that is, δ18O(zircon) ≤4 ‰ VSMOW. In many metaigneous rock samples from Tongbai-Dabie-Sulu, including high-pressure and ultrahigh-pressure eclogites and associated granitic orthogneisses, average δ18O values for Neoproterozoic "igneous" zircon cores (i. e., 800-600 Ma) vary from -0. 9 to 6. 9 ‰, and from -9. 9 to 6. 8 ‰ for Triassic metamorphic rims (i. e., 245-200 Ma). The former extend to values lower than zircons in primitive magmas from the Earth's mantle (ca. 5-6 ‰). The average Δ18O (metamorphic zircon - "igneous" zircon) values vary from -11. 6 to 0. 9 ‰. The large volume of Neoproterozoic low-δ18O igneous protoliths at Tongbai-Dabie-Sulu is matched only by the felsic volcanic rocks of the Snake River Plain hotspot track, which terminates at the Yellowstone Plateau. Hence, the low-δ18O values at Tongbai-Dabie-Sulu are proposed to result from shallow subcaldera processes by comparison with Yellowstone, where repeated caldera-forming magmatism and hydrothermal alteration created similar low-δ18O magmas. However, the possibility of involvement of meltwaters from local continental glaciations, rather than global Neoproterozoic glaciations, cannot be precluded. Our data indicate that Neoproterozoic low-δ18O magmas that are either subduction- or rift-related are present locally along the western margin of the South China Block (e. g., Baoxing Complex). It appears that Neoproterozoic 18O-depletion events in the South China Block as the result of hydrothermal alteration and magmatism affected a much larger area than was previously recognized.
dc.publisherSpringer
dc.sourceContributions to Mineralogy and Petrology
dc.subjectKeywords: caldera; hot spot; hydrothermal alteration; igneous province; orogenic belt; oxygen isotope; Proterozoic; spatial distribution; ultrahigh pressure metamorphism; uranium-lead dating; volcanic rock; zircon; Autonomous Region in Muslim Mindanao; China; Dabie Oxygen isotopes; Qinling-Tongbai-Dabie-Sulu orogenic belt; South China Block; Ultrahigh-pressure metamorphism; Zircon
dc.titleOrigin of the Tongbai-Dabie-Sulu Neoproterozoic low-d18O igneous province, east-central China
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume165
dc.date.issued2013
local.identifier.absfor040203 - Isotope Geochemistry
local.identifier.ariespublicationu4027924xPUB369
local.type.statusPublished Version
local.contributor.affiliationFu, Bin, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationKita, Noriko T, University of Wisconsin
local.contributor.affiliationWilde, Simon, Curtin University of Technology
local.contributor.affiliationLiu, Xiaochun, Chinese Academy of Geological Sciences
local.contributor.affiliationCliff, John, University of Western Australia
local.contributor.affiliationGreig, Alan, University of Melbourne
local.description.embargo2037-12-31
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage641
local.bibliographicCitation.lastpage662
local.identifier.doi10.1007/s00410-012-0828-3
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2016-02-24T10:29:41Z
local.identifier.scopusID2-s2.0-84875376995
CollectionsANU Research Publications

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