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Titolo:
Ar-Ar and fission-track ages in the Song Chay Massif: Early Triassic and Cenozoic tectonics in northern Vietnam
Autore:
Maluski, H; Lepvrier, C; Jolivet, L; Carter, A; Roques, D; Beyssac, O; Tang, TT; Thang, ND; Avigad, D;
Indirizzi:
Univ Montpellier 2, CNRS, ISTEM, F-34095 Montpellier, France Univ Montpellier 2 Montpellier France F-34095 -34095 Montpellier, France Univ Paris 06, Lab Tecton, F-75252 Paris 05, France Univ Paris 06 Paris France 05 s 06, Lab Tecton, F-75252 Paris 05, France Univ London Birkbeck Coll, Dept Earth Sci, London Fiss Track Res Grp, London WC1E 6BT, England Univ London Birkbeck Coll London England WC1E 6BT ndon WC1E 6BT, England Ecole Normale Super, Geol Lab, F-75231 Paris 05, France Ecole Normale Super Paris France 05 , Geol Lab, F-75231 Paris 05, France Natl Univ Vietnam, Hanoi, Vietnam Natl Univ Vietnam Hanoi VietnamNatl Univ Vietnam, Hanoi, Vietnam Geol Survey, Hanoi, Vietnam Geol Survey Hanoi VietnamGeol Survey, Hanoi, Vietnam
Titolo Testata:
JOURNAL OF ASIAN EARTH SCIENCES
fascicolo: 1-2, volume: 19, anno: 2001,
pagine: 233 - 248
SICI:
1367-9120(200102)19:1-2<233:AAFAIT>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
RIVER SHEAR ZONE; INDO-CHINA; SOUTH CHINA; TEMPERATURE; EXTENSION; EXTRUSION; EVOLUTION; COLLISION; EURASIA; MIOCENE;
Keywords:
Ar-Ar method; fission-track ages; Song Chay Massif; Vietnam;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Maluski, H Univ Montpellier 2, CNRS, ISTEM, 2 Pl Eugene Bataillon, F-34095Montpellier, France Univ Montpellier 2 2 Pl Eugene Bataillon Montpellier France F-34095
Citazione:
H. Maluski et al., "Ar-Ar and fission-track ages in the Song Chay Massif: Early Triassic and Cenozoic tectonics in northern Vietnam", J ASIAN E S, 19(1-2), 2001, pp. 233-248

Abstract

The Song Chay Massif is the northeasternmost metamorphic complex in Vietnam, to the east of the Red River Shear Zone. It shows a large antiformal structure involving orthogneisses and migmatites overlain, on its northern Rank, by muscovite bearing marbles. An E-W striking fault bounds the dome to the South. Kinematic indicators along a S-N section reveal top-to-the-N shear sense along the interface between the orthogneissic core and the overlying metasediments. Radiometric ages were obtained by the Ar-40-Ar-39 method using purified mica separates. Across the dome ages range from 236 Ma at thesouthern edge to 160 Ma in the core, attesting to a strong imprint in the Early Triassic time. A clear difference is seen between these Mesozoic agesand the Eocene to Miocene ages (from 40 to 24 Ma) that obtained in the nearby Red River Shear Zone using the same method. These data show that the Song Chay Massif was already high in the crust when the high temperature deformation of the Red River Shear Zone took place. The final exhumation of theSong Chay orthogneiss constrained by fission-track analysis on samples along the same transect occurred during the Early Miocene and could be interpreted as the consequence of a first normal sense of motion along the fault which bounds the massif to the south. Timing is similar to that of exhumation in the Red River Shear zone. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 01:01:08