Petrogenesis and geological significance of the early Paleozoic S-Type granitic mylonite in the Southwestern Kon Tum Massif, Central Vietnam
Author affiliations
DOI:
https://doi.org/10.15625/2615-9783/23115Keywords:
Chu Lai complex, S-type granite, Viet-Laos Terrane, Viet-Cam Terrane, suture zoneAbstract
The Kon Tum Massif (KTM) in central Vietnam represents a key geological component of the Viet-Cam Terrane (VCT), whose early Paleozoic evolution remains poorly constrained, especially along its southwestern margin of the KTM. This study presents new field, petrographic, zircon U-Pb geochronological, and Hf isotopic data, as well as whole-rock geochemical data, from early Paleozoic S-type magmatic rocks in the southwestern KTM, to refine their emplacement age, tectonic setting, and regional geological implications. Zircon U-Pb dating of two samples yields crystallization ages of 445.4±3.5 Ma and 427.5±1.4 Ma, consistent with late Ordovician and early Silurian magmatism. The negative εHf(t) values and rich inherited Paleo- and Neo-Proterozoic zircon indicate a sedimentary-dominated crustal source. At the same time, trace element signatures are characteristic of post-collisional S-type granites. These new findings, in conjunction with a comparable S-type Chu Lai complex in the northern KTM, support a widespread post-collision magmatism during the late Ordovician-Silurian within the KTM. Furthermore, the presence of post-collisional magmatic rocks across the KTM and TSB suggests that the post-collisional tectonic phase had a broad impact on most of the eastern Indochina block during the Late Ordovician-Silurian. This further implies that the collision between the KTM and TSB should have occurred before the late Ordovician.
Downloads
References
Andersen T., 2002. Correction of common lead in U-Pb analyses that do not report 204Pb. Chemical Geology, 192, 59–79. https://doi.org/10.1016/S0009-2541(02)00195-X.
Blichert-Toft J., Albarède F., 1997. The Lu-Hf isotope geochemistry of chondrites and the evolution of the mantle-crust system. Earth and Planetary Science Letters, 148, 243–258. https://doi.org/10.1016/S0012-821X(97)00040-X.
Bui H.B., Ngo X.T., Song Y., Itaya T., Yagi K., Khuong T.H., Nguyen T.D., 2016. K Ar Dating of Fault Gouges from the Red River Fault Zone of Vietnam”. Acta Geologica Sinica (English Edition), 90(5), 1653–1663. https://doi.org/10.1111/1755-6724.12808
Bui V.T.S., Osanai Y., Nakano N., Adachi T., Kitano I., Owada M., 2020. Timing of high-grade metamorphism in the Kon Tum Massif, Vietnam: Constraints from zircon-monazite multi-geochronology and trace elements geochemistry of zircon-monazite-garnet. Journal of Asian Earth Sciences, 187, 104084.
Carter A., Roques D., Bristow C., Kinny P., 2001. Understanding Mesozoic accretion in Southeast Asia: significance of Triassic thermotectonism (Indosinian orogeny) in Vietnam. Geology, 29, 211. https://doi.org/10.1130/0091-7613(2001)029<0211:UMAISA>2.0.CO;2.
Chappell B.W., White A.J.R., 1992, I- and S-type granites in the Lachlan Fold belt, Transactions of the Royal Society of Edinburgh. Earth Sciences, 83, 1–26. Doi: 10.1017/S0263593300007720.
Dinh Q.S., 2017. Petrographic characteristics and zircon U-Pb geochronology of granitogneiss rocks in the Chu Lai - Kham Duc area (Quang Nam province). Science & Technology Development Journal. Natural Science, 1(6), 258–272 (in Vietnamese with English abstract).
Faure M., Nguyen V.V., Luong T.T.H., Lepvrier C., 2018. Early Paleozoic or Early-Middle Triassic collision between the South China and Indochina blocks: The controversy resolved? Structural insights from the Kon Tum massif (central Vietnam). Journal of Asian Earth Sciences, 166, 162–180.
Gardner C.J., Graham I.T., Belousova E., Booth G.W., Greig A., 2017. Evidence for Ordovician subduction-related magmatism in the Truong Son terrane, SE Laos: Implications for Gondwana evolution and porphyry Cu exploration potential in SE Asia. Gondwana Research, 44, 139–156.
Harris N.B.W., Pearce J.A., Tindle A.G., 1986. Geochemical characteristics of collision-zone magmatism. Geol. Soc. Lond. Spec. Publ., 191, 67–81.
Iizuka T., Hirata T., 2005. Improvements of precision and accuracy in in-situ Hf isotope microanalysis of zircon using the laser ablation-MC-ICPMS technique. Chemical Geology, 220, 121–137. https://doi.org/10.1016/j.chemgeo.2005.03.010.
Izokh A.E., Tran T.H., Ngo T.P., Tran Q.H., 2006. Ophiolite ultramafic-mafic associations in the northern structure of the Kon Tum block (Central Vietnam). Journal of Geology, 28, 20–26.
Jiang W., Yu J.H., Wang X., Griffin W.L., Pham T.H., Nguyen D.L., Wang F., 2020. Early Paleozoic magmatism in northern Kontum Massif, Central Vietnam: Insights into tectonic evolution of the eastern Indochina Block. Lithos, 105750, 376–377.
Kee W.-S., Kim S.W., Kwon S., Santosh M., Ko K., Jeong Y.-J., 2019. Early Neoproterozoic (ca. 913–895 Ma) arc magmatism along the central-western Korean Peninsula: Implications for the amalgamation of Rodinia supercontinent. Precambrian Research, 335. https://doi.org/10.1016/j.
Lai S.C., Zhu R.Z., 2021. Three stages of early Paleozoic magmatism in the Tibetan-Himalayan orogen: New insights into the final Gondwana assembly. Journal of Asian Earth Sciences, 221, 104949.
Lan C.Y., Chung S.L., Long T.V., Lo C.H., 2003. Geochemical and Sr-Nd isotopic constraints from the Kontum massif, central Vietnam on the crustal evolution of the Indochina block. Precambrian Research 112, 7–27.
Lee T.H., Park K.H., Yi K., 2018. Nature and evolution of the Cretaceous basins in the eastern margin of Eurasia: A case study of the Gyeongsang Basin, SE Korea. Journal of Asian Earth Sciences, 166, 19–31. https://doi.org/10.1016/j.jseaes.2018.07.004.
Lepvriera C., Maluski H., Vu V.T., Leyreloup A., Phan T.T., Nguyen V.V., 2004. The Early Triassic Indosinian orogeny in Vietnam (Truong Son Belt and Kontum Massif); implications for the geodynamic evolution of Indochina. Tectonophysics 393, 87–118. https://doi.org/10.1016/j.tecto.2004.07.030.
Lepvrier C., Nguyen V.V., Maluski H., Phan T.T., Vu V.T., 2008. Indosinian tectonics in VietnamTectonique indosinienne au Vietnam. Comptes Rendus Geoscience, 340(2–3), 94–111. https://doi.org/10.1016/j.crte.2007.10.005.
Ludwig K.R., 2008, Isoplot 3.7: a geochronological toolkit for Microsoft Excel, Berkeley, California. Berkeley Geochronology Center Special Publication, 4, 77p.
Luong T.T.H., Nguyen V.V., Faure M., Wei L., Vu T.T., Tran T.T.N., Nguyen T M., 2024. From rifting to Indosinian orogeny recorded in the Indochina from late Devonian to late Triassic: A review. Vietnam Journal of Earth Sciences, 47(1), 59–89. https://doi.org/10.15625/2615-9783/21910.
Maniar P.D., Piccoli P.M., 1989. Tectonic discrimination of granitoids. Geol. Soc. Am. Bull., 101, 635–643.
Middlemost E.A.K., 1985. Magma and Magmatic Rocks. Longman, London, p.266.
Nakano N., Osanai Y., Owada M., Tran N.N., Charusiri P., Khamphavong K., 2013. Tectonic evolution of high-grade metamorphic terranes in Central Vietnam: constraints from large-scale monazite geochronology. Journal of Asian Earth Sciences, 73, 520–539.
Ngo X.T., Tran T.H., Nguyen H., Vu Q.L., Kwon S., Itaya T., Santosh M., 2014. Backarc mafic-ultramafic magmatism in Northeastern Vietnam and its regional tectonic significance. Journal of Asian Earth Sciences, 15(90), 45–60. https://doi.org/10.1016/j.jseaes.2014.04.001.
Ngo X.T., Santosh M., Tran H.T., Pham H.T., 2015. Subduction initiation of Indochina and South China blocks: Insight from the forearc ophiolitic peridotites of the Song Ma Suture Zone in Vietnam. Geological Journal, 51(3), 421–442. https://doi.org/10.1002/gj.2640.
Ngo X.T., Bui V.H., Tran M.D., Kim Y., Xiaochun L., Tran T.H., Kwon S., Jang Y., Bui V.S., Luong Q.K., 2022. Ordovician continental arc magmatism in the Tam Ky‐Phuoc Son Suture Zone, Central Indochina Block, Southeast Asia. Geological Journal, 58(2), 825–836. https://doi.org/10.1002/gj.4626.
Ngo X.T., Nguyen Q.H., Kim Y., Kwon S., Bui V.H., Tran T.H., Jang Y., Samuel V.O., 2024. Cambrian-Ordovician Arc-Related Magmatism in the Central Southeast Asian Continents and Its Significance on Early Palaeozoic Tectonics of the Indochina Block. Geological Journal. https://doi.org/10.1002/gj.5102.
Nguyen H.T., Zong K., Liu Y., Yuan Y., Pham T.H., Le T.D., Pham M., 2021. Early Paleozoic Arc Magmatism and Accretionary Orogenesis in the Indochina Block, Southeast Asia. The Journal of Geology, 129, 33–48.
Nguyen H.T., Le T.D., To X.B., Pham T.V.A., Ngo X.T., Ha T.N., Nguyen T.L.L., 2022. U-Pb zircon LA-ICP-MS and Hf composition in granitogneiss of Chu Lai body and its implication of the Kontum massif, central Vietnam. Journal of Mining and Earth Sciences, 63(4), 35–44 (in Vietnamese with English abstract).
Nguyen K.H., Nong T.Q.A., Pham M., Pham T.H., Nguyen T.T., 2023. Geochemistry and zircon U-Pb geochronology of the Dak Krong plutonic rocks in the Kontum Massif (central Vietnam) and their petrogenetic implications. Vietnam Journal of Earth Sciences, 45(3), 303–325. https://doi.org/10.15625/2615-9783/18411.
Nguyen M.Q., Feng Q., WeiZi J., Zhao T., Tran T.H., Ngo X.T., Tran M.D., Nguyen Q.H., 2019. Cambrian intra-oceanic arc trondhjemite and tonalite in the Tam Ky-Phuoc Son Suture Zone, central Vietnam: Implications for the early Paleozoic assembly of the Indochina Block. Gondwana Research, 70, 151–170.
Nguyen Q.H., Ngo X.T., Vu A.D., 2020. U-Pb ages of zircon from I- and S-type granites from northern Kon Tum terrane: Implications for late Paleozoic-Mesozoic magmatism in Central Vietnam. Journal of the Geological Society of Korea, 56(6), 727–735. https://doi.org/10.14770/jgsk.2020.56.6.727.
Nguyen Q.H., Tran T.H., Vu A.D., Ngo X.T., 2021. Late Pleistocene movement of Nam O-Nam Dong fault: Evidence from electron spin resonance dating of fault gouge in the western Da Nang city. Vietnam Journal of Earth Sciences, 43(3), 316–322. https://doi.org/10.15625/2615-9783/16198.
Nguyen T.B.T., Nguyen T.X. Bui T.A., Pham M., Pham T.H., Duong Q.B., 2024. Early Paleozoic tectonic evolution in the central Vietnam: evidence from geochronological and geochemical constraints. International Geology Review, 1–17.
Nguyen T.M., Nguyen T.D., Doan D.H., Pham M., Yu Y., Pham T.H., 2020. Zircon U-Pb ages, geochemistry and isotopic characteristicsof the Chu Lai granitic pluton in the Kontum massif, central Vietnam. Mineralogy and Petrology, 114, 289–303. https://doi.org/10.1007/s00710-020-00707-x.
Nguyen X.B., Duong V.C., Trinh V.L., 2015. Tectonic zones of continental southern Viet Nam. J. Geol. Ser. A, 11–27 (in Vietnamese with English abstract).
Osanai Y., Nakano N., Owada M., Nam T.N., Miyamoto T., Minh N.T., Nam N.V., Tri T.V., 2008. Collision zone metamorphism in Vietnam and adjacent Southeastern Asia: proposition for Trans Vietnam Orogenic Belt. J. Mineral. Petrol. Sci., 103, 226–241.
Paton C., Hellstrom J., Paul B., Woodhead J., Hergt J., 2011. Iolite: freeware for the visualization and processing of mass spectrometric data. Journal of Analytical Atomic Spectrometry, 26, 2508–2518. https://doi.org/10.1039/C1JA10172B.
Pearce J.A., Harris N.B.W., Tindle A.G., 1984. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks. J. Petrol., 254, 956–983.
Peccerillo A., Taylor S.R., 1976. Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area, northern Turkey. Contrib. Mineral. Petrol., 58, 63–81.
Pitcher W.S., 1983. Granite type and tectonic environment. In: Hsu, K. (Ed.), Mountain Building Processes. Academic Press, London, 19–40.
Pham T.H., Tran D., Tran X.H., Pham M., Bui K.N., 2020. The petrographic - Geochemical characteristics of ultramafic rocks in Tan Lap area, Kon Tum and their geological implication. Vietnam Geology Journal, Series A374–375, 1–15 (in Vietnamese with English abstract).
Phan Cu Tien (Editor), 2009. Geological Map of Vambodia, Laos and Vietnam, Scale 1:1,500,000. Vietnam Institute of Geosciences and Mineral Resources (VIGMR) (in Vietnamese).
Roger F., Maluski H., Leyreloup A., Lepvrier C., Phan T.T., 2007. U-Pb dating of high temperature metamorphic episodes in the Kon Tum Massif (Vietnam). Journal of Asian Earth Sciences, 30, 565–572.
Scherer E., Münker C., Mezger K., 2001. Calibration of the lutetium-hafnium clock. Science, 293, 683–686. https://doi.org/10.1126/science.10613.
Sylvester P.J., 1998. Post-collisional strongly peraluminous granites. Lithos, 45, 29–44.
Sun S.S., McDonough W.F., 1989. Chemical and isotopic systematics of oceanic basalts; implications for mantle composition and processes. In: Magmatism in the ocean basins. Saunders A.D. & Norry M.J. (Eds.), Geological Society of London, London, 42, 313–345.
Tran H.T., Zaw K., Halpin J.A., Manaka T., Meffre S., Lai C.K., Lee Y., Le H.V., Dinh S., 2014. The Tam Ky-Phuoc Son Shear Zone in central Vietnam: Tectonic and metallogenic implications. Gondwana Research, 26(1), 144–164. 10.1016/j.gr.2013.04.008.
Tran T.A., Pham N.C., Nguyen H., Vu H.L., Ngo T.H., Tran Q.C., Pham T.P.L., Tran T.H., Vuong B.T.S., Pham T.T., 2024. Petrological and geochemical characteristics of the Low- and High-Hf Nam Meng dioritoid, northwest Vietnam: Implication for the mantle partial melting, mixing, and magmatic differentiation. Vietnam Journal of Earth Sciences, 46(2), 252–271. https://doi.org/10.15625/2615-9783/20274
Tran V.T., Faure M., Nguyen V.V., Bui H.H., Fyhn M.B.W., Nguyen T.Q., Lepvrier C., Thomsen T.B., Tani K., Charusiri P., 2020. Neoproterozoic to Early Triassic tectono-stratigraphic evolution of Indochina and adjacent areas: A review with new data. Journal of Asian Earth Sciences, 191, 1–23.
Tran T.H., Zaw K., Halpin J., Nguyen H.H., Carter A., Ngo X.T., Bui V.H., 2019. Precambrian Crust in the Kon Tum Core Metamorphic: Evidences and Existence of a new tectonic model. Conference Proceeding "Basic Research in Earth and Environment Sciences" (in Vietnamese with English abstract). Doi: 10.15625/vap.2019.00094 85.
Tran V.T., Vu K., (Eds.), 2011. Geology and Earth Resources of Vietnam. Publishing House for Science and Technology, Hanoi, Vietnam, 645p.
Tran T. (editor), 1997. Geological and mineral resources map of Vietnam on 1:200,000, Kon Tum sheet, D-48-XVIII. Published and copyright by Department Geology and Minerals of Vietnam, Hanoi.
Trinh T.L., Tran T.H., Nguyen H.H., Carter A., 2019. New results of the study on isotopic age of the Granodiorite of Chu Lai Complex in North Eastern Quang Ngai by U - Pb zircon isotope dating method. Journal of Mining and Earth Sciences, 60(1), 7–14 (in Vietnamese with English abstract).
Usuki T., Lan C.Y., Yui T.F., Iizuka Y., Vu T.V., Tran T.A., Okamoto K., Wooden J.L., Liou J.G., 2009. Early Paleozoic medium-pressure metamorphism in central Vietnam: evidence from SHRIMP U-Pb zircon ages. Geosciences Journal, 13, 245–256.
Vernon R., 2011. Microstructures of melt-bearing regional metamorphic rocks. Memoir of the Geological Society of America. In: Origin and Evolution of Precambrian High-Grade Gneiss Terranes, with Special Emphasis on the Limpopo Complex of Southern Africa, 207, 1–11. https://doi.org/10.1130/2011.1207(01).
Wilson M.R., 1989. Igneous Petrogenesis. Unwin Hyman, London, p.469.
