Abstract
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.
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ACKNOWLEDGMENTS
This paper is dedicated to the memory of Professor E.P. Izokh and Professor A.P. Ponomareva, whose geological and geochemical materials became a basis for the paper. The authors are grateful to the Vietnamese geologists Hang Chung, Phan Thien, Nguyen Van Kuen, and Nguyen Duc Thang, who participated in the Soviet–Vietnamese expedition of 1985–1986, during which a working legend for igneous complexes of South Vietnam was elaborated for state geological mapping on a 1 : 500 00 scale. The authors are grateful to the Director of the Institute of Geological Sciences, Vietnam Academy of Sciences and Technologies Tran Tuan Anh and Director of the Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences Doctor of Geol.-Mineral. Sci. N.N. Kruk for support of revision works in the Dalat Zone, South Vietnam. A special acknowledgment goes to Doctor of Geol.-Mineral. Sci. V.V. Golozubov (Far East Geological Institute, Far East Branch, Russian Academy of Sciences, Vladivostok) for careful tracking of this paper. The critical comments of V.V. Golozubov and an anonymous reviewer allowed significant improvement of the factual material.
Funding
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).
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Vladimirov, A.G., Phan, L.A., Travin, A.V. et al. The Geology and Thermochronology of Cretaceous Magmatism of Southeastern Vietnam. Russ. J. of Pac. Geol. 14, 305–325 (2020). https://doi.org/10.1134/S1819714020040065
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DOI: https://doi.org/10.1134/S1819714020040065