Granitoids in the Dalat zone,southern Vietnam: age constraints on magmatism and regional geological implications |
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| Authors: | Email author" target="_blank">Thuy?Thi?Bich?NguyenEmail author Muharrem?Satir Wolfgang?Siebel Fukun?Chen |
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| Institution: | (1) Institut für Geowissenschaften, Universität Tübingen, Wilhelmstr. 56, 72074 Tübingen, Germany;(2) Research Institute of Geology and Mineral Resources, Thanh Xuan-Dong Da, Hanoi, Vietnam;(3) Laboratory for Radiogenic Isotope Geochemistry, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, 100029 Beijing, P.R. of China |
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| Abstract: | The Dalat zone in southern Vietnam comprises a Cretaceous Andean-type magmatic arc with voluminous granitoids and contemporary volcanic rocks. On the basis of petrographical and mineralogical studies, the granitoids were subdivided into three suites: Dinhquan, Deoca and Cana. Rocks of the Dinhquan suite are hornblende–biotite diorites, granodiorites and minor granites. The Cana suite encompasses mainly leucocratic biotite-bearing granites with scarce hornblende. The Deoca suite is made up of granodiorites, monzogranites and granites. Geochemically, the granitoids are of subalkaline affinity, belong to the high-K, calc-alkaline series, and most of them display typical features of I-type granites. This paper presents the new Rb–Sr mineral and U–Pb zircon and titanite age data for the granitoids, which establish the ages of the plutonic suites as: the Dinhquan at ~112–100 Ma, Cana at ~96–93 Ma and Deoca at ~92–88 Ma. These ages are significantly different from earlier publications, and indicate that the earliest magmatism in the Dalat zone began at ~112 Ma ago, that is ~30–50 Ma later than previously thought. Our geochronological data are also support the continuation of an Andean-type arc running from SE China via southern Vietnam to SW Borneo. |
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| Keywords: | Dalat zone Granitoids Intrusion sequence Rb– Sr mineral and U– Pb zircon and titanite dating Southern Vietnam |
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