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Long-lived melting of ancient lower crust of the North China Craton in response to paleo-Pacific plate subduction, recorded by adakitic rhyolite

Wang, Chao; Song, Shuguang; Niu, Yaoling; Allen, Mark B.; Su, Li; Wei, Chunjing; Zhang, Guibin; Fu, Bin

Description

Magmatism in eastern China in response to paleo-Pacific plate subduction during the Mesozoic was complex, and it is unclear how and when exactly the magmas formed via thinning and partial destruction of the continental lithosphere. To better understand this magmatism, we report the results of a geochronological and geochemical study of Early Cretaceous adakitic rhyolite (erupted at 125.4 ± 2.2 Ma) in the Xintaimen area within the eastern North China Craton (NCC). In situ zircon U-Pb dating...[Show more]

dc.contributor.authorWang, Chao
dc.contributor.authorSong, Shuguang
dc.contributor.authorNiu, Yaoling
dc.contributor.authorAllen, Mark B.
dc.contributor.authorSu, Li
dc.contributor.authorWei, Chunjing
dc.contributor.authorZhang, Guibin
dc.contributor.authorFu, Bin
dc.date.accessioned2018-01-09T04:37:11Z
dc.identifier.issn0024-4937
dc.identifier.urihttp://hdl.handle.net/1885/139117
dc.description.abstractMagmatism in eastern China in response to paleo-Pacific plate subduction during the Mesozoic was complex, and it is unclear how and when exactly the magmas formed via thinning and partial destruction of the continental lithosphere. To better understand this magmatism, we report the results of a geochronological and geochemical study of Early Cretaceous adakitic rhyolite (erupted at 125.4 ± 2.2 Ma) in the Xintaimen area within the eastern North China Craton (NCC). In situ zircon U-Pb dating shows that this adakitic rhyolite records a long (~ 70 Myrs) and complicated period of magmatism with concordant ²⁰⁶Pb/²³⁸U ages from 193 Ma to 117 Ma. The enriched bulk rock Sr-Nd isotopic compositions of the Xintaimen adakitic rhyolite, as well as the enriched zircon Hf and O isotopic compositions, indicate that the magmas parental to the adakitic rhyolite were derived from partial melting of the Paleoproterozoic mafic lower crust, heated by mafic melts derived from the mantle during the paleo-Pacific plate subduction. A minor older basement component is indicated by the presence of captured Neoarchean to Early Paleoproterozoic zircons. The Mesozoic zircons have restricted Hf and O isotopic compositions irrespective of their ages, suggesting that they formed from similar sources at similar melting conditions. The Xintaimen adakitic rhyolite offers an independent line of evidence that the ancient lower crust of eastern China underwent a long period (~ 70 Myrs) of destruction, melting or remelting, from ~ 193 to ~ 120 Ma, related to the subduction of the paleo-Pacific plate beneath eastern China.
dc.description.sponsorshipThis study was supported by the National Natural Science Foundation of China (grant number 41430207, 41372060, 41572040, 41622202) and the National Key Basic Research Program of China (grant number 2013CB429806). Chao Wang wishes to acknowledge Chinese Scholarship Council for the financial support during his visit in Durham University (grant number 201606010063)
dc.format.mimetypeapplication/pdf
dc.publisherElsevier
dc.rights© 2017 Elsevier B.V.
dc.sourceLithos
dc.subjectAdakitic rhyolite
dc.subjectLong-lived lower crustal melting
dc.subjectCratonic destruction
dc.subjectPaleo-Pacific plate subduction
dc.subjectNorth China Craton
dc.titleLong-lived melting of ancient lower crust of the North China Craton in response to paleo-Pacific plate subduction, recorded by adakitic rhyolite
dc.typeJournal article
local.identifier.citationvolume292-293
dc.date.issued2017
local.publisher.urlhttps://www.elsevier.com/
local.type.statusAccepted Version
local.contributor.affiliationFu, B., Research School of Earth Sciences, The Australian National University
local.bibliographicCitation.startpage437
local.bibliographicCitation.lastpage451
local.identifier.doi10.1016/j.lithos.2017.09.031
dcterms.accessRightsOpen Access
dc.provenancehttp://www.sherpa.ac.uk/romeo/issn/0024-4937/..."Author's post-print on open access repository after an embargo period of between 12 months and 48 months" from SHERPA/RoMEO site (as at 9/01/18).
CollectionsANU Research Publications

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