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Palaeoarchaean materials in the Tibetan Plateau indicated by zircon

Sun, Saijun; Ireland, Trevor; Zhang, Lipeng; Zhang, Rongqing; Zhang, Chan-chan; Sun, Weidong

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The early tectonic evolution of the Lhasa Terrane remains poorly understood, although evidence for a substantial prehistory has been reported recently. We have carried out in situ zircon U–Pb dating and Hf–O isotopes of late Early Cretaceous monzogranites and get a surprising package of inherited zircons, not only because of their age profile, but also because the oldest Palaeoarchaean zircons are euhedral. The discovery of Palaeoarchaean euhedral zircons in the region suggests the presence of...[Show more]

dc.contributor.authorSun, Saijun
dc.contributor.authorIreland, Trevor
dc.contributor.authorZhang, Lipeng
dc.contributor.authorZhang, Rongqing
dc.contributor.authorZhang, Chan-chan
dc.contributor.authorSun, Weidong
dc.date.accessioned2019-04-29T01:24:34Z
dc.identifier.issn0020-6814
dc.identifier.urihttp://hdl.handle.net/1885/160678
dc.description.abstractThe early tectonic evolution of the Lhasa Terrane remains poorly understood, although evidence for a substantial prehistory has been reported recently. We have carried out in situ zircon U–Pb dating and Hf–O isotopes of late Early Cretaceous monzogranites and get a surprising package of inherited zircons, not only because of their age profile, but also because the oldest Palaeoarchaean zircons are euhedral. The discovery of Palaeoarchaean euhedral zircons in the region suggests the presence of extremely old rocks in Tibet. Zircons from the Nagqu monzogranite yield five age peaks at ~3.45 Ga, ~2.56 Ga, ~1.76 Ga, ~900 Ma, and ~111 Ma. They have large variations in εHf(t) values (−45.1–9.2) and old Hf model ages (924–3935 Ma), with variable δ18O values of −5.80–9.64. Palaeoarchaean zircons (~3.20–3.45 Ga) are euhedral with magmatic zircon characteristics. One of the grains has negative &epsilon'Hf(t) value (−4.8), old Hf model age (3935 Ma), and high positive δ18O value (7.27), which suggests an ancient crustal origin. The source of Palaeoarchaean euhedral zircons should be proximal to prevent long-distance transport and abrasion, whereas the late Early Cretaceous monzogranites are I-type. Thus, Palaeoarchaean euhedral zircons are most likely captured from the country rocks by assimilation at depth or may be relics of previous magmatic zircons. Notwithstanding their exact history, Palaeoarchaean euhedral zircons indicate Palaeoarchaean materials near Nagqu in the Tibetan Plateau. The inherited zircons also experienced a Late Palaeoproterozoic event (~1.76 Ga) likely related to the evolution of the India block. The peak at ~900 Ma suggests affinity to the Qiangtang and Himalaya blocks.
dc.description.sponsorshipThis study was supported by the DREAM project of MOST China 2016YFC0600408, NSFC 91328204. This is contribution No. IS-000 from GIGCAS. TRI acknowledges a Chinese Academy of Sciences President’s International Fellowship for visiting scientists, Grant No. 2015VEA003.
dc.format.extent13 pages
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherTaylor & Francis
dc.rights© 2017 Informa UK Limited, trading as Taylor & Francis Group
dc.sourceInternational Geology Review
dc.subjectPalaeoarchaean materials
dc.subjectPalaeoarchaean zircons
dc.subjectLhasa Terrane
dc.subjectZircon Hf–O isotopes
dc.titlePalaeoarchaean materials in the Tibetan Plateau indicated by zircon
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume60
dcterms.dateAccepted2017-08-12
dc.date.issued2018
local.identifier.absfor040303 - Geochronology
local.identifier.ariespublicationu4485658xPUB2473
local.publisher.urlhttps://taylorandfrancis.com/
local.type.statusPublished Version
local.contributor.affiliationSun, Saijun, Chinese Academy of Sciences
local.contributor.affiliationIreland, Trevor, College of Science, The Australian National University
local.contributor.affiliationZhang, Lipeng, Chinese Academy of Sciences
local.contributor.affiliationZhang, Rongqing, Chinese Academy of Sciences
local.contributor.affiliationZhang, Chan-chan, Chinese Academy of Sciences
local.contributor.affiliationSun, Weidong, Chinese Academy of Sciences
local.description.embargo2037-12-31
local.identifier.essn1938-2839
local.bibliographicCitation.issue8
local.bibliographicCitation.startpage1061
local.bibliographicCitation.lastpage1072
local.identifier.doi10.1080/00206814.2017.1367967
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2019-03-12T07:34:52Z
local.identifier.scopusID2-s2.0-85028562940
local.identifier.thomsonID000430094900007
dc.provenancehttp://sherpa.ac.uk/romeo/issn/0020-6814/Author can archive pre-print (ie pre-refereeing). Author can archive post-print (ie final draft post-refereeing) with a 12 months embargo (Sherpa/Romeo as of 29/4/2019)
CollectionsANU Research Publications

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