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dc.contributor.authorWang, Yuejun
dc.contributor.authorHe, Huiying
dc.contributor.authorCawood, Peter A.
dc.contributor.authorFan, Weiming
dc.contributor.authorSrithai, Boontarika
dc.contributor.authorFeng, Qinlai
dc.contributor.authorZhang, Yuzhi
dc.contributor.authorQian, Xin
dc.identifier.citationWang , Y , He , H , Cawood , P A , Fan , W , Srithai , B , Feng , Q , Zhang , Y & Qian , X 2016 , ' Geochronological, elemental and Sr-Nd-Hf-O isotopic constraints on the petrogenesis of the Triassic post-collisional granitic rocks in NW Thailand and its Paleotethyan implications ' , Lithos , vol. 226-267 , pp. 264-286 .
dc.identifier.otherPURE: 246033897
dc.identifier.otherPURE UUID: 08b50b03-8c37-4f52-9278-94c190184d7a
dc.identifier.otherRIS: urn:3388810FFFD4CB085E3420EE5A5F63D6
dc.identifier.otherScopus: 84995390445
dc.identifier.otherWOS: 000390724200015
dc.descriptionThis study was jointly funded by the National Science Foundation of China (41190073), National Basic Research Program of China (2014CB440901 and 2016YFC0600303) and the Fundamental Research Funds for the Central Universities to SYSU.en
dc.description.abstractNew U-Pb geochronological, petrologic, elemental and Sr-Nd-Hf-O isotopic data for the granites from the Inthanon and Sukhothai zones in NW Thailand in conjunction with correlations with SW China are presented to constrain the age and position of the Paleotethys Ocean in this region and the associated assembly of Southeast Asia. The geochronological data show that the granitic rocks in the Inthanon and Sukhothai zones, herein named Group 1 and Group 2 granites, respectively, yield similar crystallization ages of 230-200 Ma. Group 1 samples are characterized by monzogranite and granite with I- and S-type geochemical affinity and Group 2 samples by I-type monzogranite and granodiorite. They have generally similar chondrite-normalized REE and PM- normalized multi-element patterns but distinct Sr-Nd-Hf-O isotopic compositions. Group 1 samples have slightly higher initial 87Sr/86Sr ratios (0.7111- 0.7293) but lower εNd(t) values (-11.1 ~ -14.1) than those of Group 2 samples (87Sr/86Sr(i)=0.7073-0.7278 and εNd(t)=-8.3 ~ -11.0). Group 1 samples show the lower εHf(t) values (-5.4 ~ -18.2), older TDM (1.62-2.40 Ga) and higher δ18O values (+ 7.95-+9.94) than those of Group 2 samples (εHf(t) of -11.1-+4.80, TDM of 0.96-1.95 Ga and δ18O of + 4.95 ~+7.98) for the Triassic crystallization zircons. These geochemical signatures are similar to the Kwangsian and Indosinian granites in the South China and Indochina blocks but distinct from those of the Gangdese I-type granite and Sibumasu Paleozoic granite. Our data suggest that Group 1 samples mainly originated from the early Paleozoic supracrustal rocks containing metapelite and metavolcanic components, which had previously experienced the surface weathering. Group 2 samples were derived from a hybridized source of an old metamorphic and a newly underplated mafic component. Synthesis of our data with available regional observations indicate that the Inthanon zone represents the main suture zone of the eastern Paleotethyan Ocean in NW Thailand and links with the Changning-Menglian suture zone in SW Yunnan (SW China). In NW Thailand, a switch from the eastward subduction of the Paleotethyan oceanic plate to the collision of the Sibumasu with Indochina blocks occurred at ~ 237 Ma, and syn- and post-collisional time being at ~ 237-230 Ma and ~ 200-230 Ma, respectively. The late Triassic granites in the Inthanon and Sukhothai zones are representative of the post-collisional magmatic products.
dc.rights© 2016 Elsevier B.V. All rights reserved. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at:
dc.subjectLate Triassic graniteen
dc.subjectZircon U-Pb datingen
dc.subjectElemental and Sr-Nd-Hf-O isotopic dataen
dc.subjectPost-collisional collapseen
dc.subjectEastern Paleotethyan evolutionen
dc.subjectNW Thailanden
dc.subjectGE Environmental Sciencesen
dc.titleGeochronological, elemental and Sr-Nd-Hf-O isotopic constraints on the petrogenesis of the Triassic post-collisional granitic rocks in NW Thailand and its Paleotethyan implicationsen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews.Earth and Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews.School of Geography and Geosciencesen
dc.contributor.institutionUniversity of St Andrews.Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews.St Andrews Isotope Geochemistryen
dc.description.statusPeer revieweden

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