TY - JOUR

T1 - The Geology and Thermochronology of Cretaceous Magmatism of Southeastern Vietnam

AU - Vladimirov, A. G.

AU - Phan, L. A.

AU - Travin, A. V.

AU - Mikheev, E. I.

AU - Murzintsev, N. G.

AU - Annikova, I. Yu

N1 - Funding Information: This work was supported by the Ministry of Science and Higher Education of the Russian Federation (project no. 5.1688.2017/PCh, expeditions), the Government of the Russian Federation (projects nos. 14.Y26.31.0012, 14.Y26.31.0018, analytical studies), Russian Foundation for Basic Research (project no. 17-05-00936a, geochronological studies), and Russian–Vietnamese projects nos. 17-55-540001 and VAST.HTQT.NGA.06/-17-18 (preparation of object-oriented database, processing of the materials, and publication). Publisher Copyright: © 2020, Pleiades Publishing, Ltd. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/7/1

Y1 - 2020/7/1

N2 - Geological, mineralogical–petrographic, and geochronological studies (U/Pb, Rb/Sr, and Ar/Ar isotope dating) of igneous complexes of the Dalat Zone identified two stages, which reflect a change in the geodynamic regime. The first, Late Jurassic, stage corresponded to a suprasubduction setting with formation of volcanic sequences of the Deobaoloc complex: calc-alkali basaltic andesites, andesites, dacites, their tuff breccias, and tuffs. The second, Albian–Coniacian, stage of the transform setting was related to a sliding zone of tectonic plates, activation of general left-lateral shear deformations at the continent–ocean boundary, and formation of paleovolcanic structures and related Dinhquan granitic batholiths (113 ± 0.6 Ma), Ancroet granites (97 ± 0.4 Ma), Deoca monzogranodiorites (90.4 ± 0.3 Ma), and Cana leucogranite–alaskites (86.8 ± 1.5 Ma). The thermochronological analysis and mathematical modeling indicate that the live period of parental granitic magma in a transform geodynamic setting was Δt of ~27 Ma and differentiation in the deep source resulted in origination of the final Cana leucogranite-alaskitic intrusive stocks with Au–Mo ± Cu mineralization.

AB - Geological, mineralogical–petrographic, and geochronological studies (U/Pb, Rb/Sr, and Ar/Ar isotope dating) of igneous complexes of the Dalat Zone identified two stages, which reflect a change in the geodynamic regime. The first, Late Jurassic, stage corresponded to a suprasubduction setting with formation of volcanic sequences of the Deobaoloc complex: calc-alkali basaltic andesites, andesites, dacites, their tuff breccias, and tuffs. The second, Albian–Coniacian, stage of the transform setting was related to a sliding zone of tectonic plates, activation of general left-lateral shear deformations at the continent–ocean boundary, and formation of paleovolcanic structures and related Dinhquan granitic batholiths (113 ± 0.6 Ma), Ancroet granites (97 ± 0.4 Ma), Deoca monzogranodiorites (90.4 ± 0.3 Ma), and Cana leucogranite–alaskites (86.8 ± 1.5 Ma). The thermochronological analysis and mathematical modeling indicate that the live period of parental granitic magma in a transform geodynamic setting was Δt of ~27 Ma and differentiation in the deep source resulted in origination of the final Cana leucogranite-alaskitic intrusive stocks with Au–Mo ± Cu mineralization.

KW - Ar/Ar isotope dating

KW - calc-alkali and subalkali granitoids

KW - Dalat Zone

KW - mathematic modeling

KW - Rb/Sr

KW - southeastern Vietnam

KW - suprasubduction and transform geodynamic settings

KW - thermchronology

KW - U/Pb

KW - PETROGENESIS

KW - SOUTHERN VIETNAM

KW - MASSIF

KW - TEMPERATURE

KW - CONSTRAINTS

KW - PROVINCE

KW - U/Pb, Rb/Sr, Ar/Ar isotope dating

KW - DALAT ZONE

KW - GRANITOIDS

KW - AGE

UR - http://www.scopus.com/inward/record.url?scp=85089281977&partnerID=8YFLogxK

U2 - 10.1134/S1819714020040065

DO - 10.1134/S1819714020040065

M3 - Article

AN - SCOPUS:85089281977

VL - 14

SP - 305

EP - 325

JO - Russian Journal of Pacific Geology

JF - Russian Journal of Pacific Geology

SN - 1819-7140

IS - 4

ER -