Geochronology and isotope analysis of the Late Paleozoic to Mesozoic granitoids from Northeastern Vietnam and implications for the evolution of the South China block - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Journal of Southeast Asian earth sciences Année : 2014

Geochronology and isotope analysis of the Late Paleozoic to Mesozoic granitoids from Northeastern Vietnam and implications for the evolution of the South China block

Résumé

In northeastern Vietnam, Late Paleozoic and Permo-Triassic granitic plutons are widespread, but their tectonic significance is controversial. In order to understand the regional magmatism and crustal evolution processes of the South China block (SCB), this study reports integrated in situ U-Pb, Hf-O and Sr-Nd isotope analyses of granitic rocks from five plutons in northeastern Vietnam. Zircon SIMS U-Pb ages of six granitic samples cluster around in two groups 255 Ma - 228 Ma and 90 Ma. Bulk-rock εNd(t) ranges from -11 to -9.7, suggesting that continental crust materials were involved in their granitic genesis. In situ zircon Hf-O isotopic measurements for the granitic samples yield a mixing trend between the mantle- and supracrustal-derived melts. It is suggested that the granitic rocks were formed by re-melting of the continental crust. These new data are compared with the Paleozoic and Mesozoic granitic rocks of South China. We argue that northeastern Vietnam belongs to the South China block. Though still speculated, an ophiolitic suture between NE Vietnam and South China, so-called Babu ophiolite, appears unlikely. The Late Paleozoic to Mesozoic magmatism in the research area provides new insights for the magmatic evolution of the South China block.
Fichier principal
Vignette du fichier
Zechao-JAsianEarthSiences.pdf (2.12 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

insu-00858117 , version 1 (13-12-2013)

Identifiants

Citer

Zechao Chen, Wei Lin, Michel Faure, Claude Lepvrier, Nguyen van Vuong, et al.. Geochronology and isotope analysis of the Late Paleozoic to Mesozoic granitoids from Northeastern Vietnam and implications for the evolution of the South China block. Journal of Southeast Asian earth sciences, 2014, 86, pp.131-150. ⟨10.1016/j.jseaes.2013.07.039⟩. ⟨insu-00858117⟩
1642 Consultations
913 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More