Late Tournaisian conodonts from the Taungnyo Group near Loi Kaw,Myanmar (Burma): Implications for Shan Plateau stratigraphy and evolution of the Gondwana-derived Sibumasu Terrane |
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| Institution: | 1. Earth Sciences, Earth Studies Building C02, School of Environmental and Rural Science, University of New England, Armidale NSW 2351, Australia;2. National Key Centre for Geochemical Evolution and Metallogeny of Continents (GEMOC), Department of Earth and Planetary Sciences, Macquarie University, NSW 2109, Australia;3. Department of Geology, Loi Kaw University, Loi Kaw, Kayah State, Myanmar;1. Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;2. Central for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;1. Key Laboratory of Economic Stratigraphy and Palaeogeography, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Institute of Geology, Tallinn University of Technology, Ehitajate tee 5, Tallinn 19086, Estonia;4. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China;5. Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China |
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| Abstract: | Carboniferous conodonts are reported for the first time from Myanmar (Burma). Conodont faunas representative of the Scaliognathus anchoralis and Gnathodus typicus–Protognathodus cordiformis conodont zones date the sampled Taungnyo Group south of Loi Kaw, Kayah State as late Tournaisian confirming a Mississippian (Lower Carboniferous) age for the sampled part of this stratigraphic unit. The dated strata are stratigraphically just below the Tournaisian–Visean (T-V) boundary. Tournaisian strata are thus for the first time unequivocally demonstrated in the Shan Plateau region of Myanmar. Similar conodont faunas from the T-V boundary interval in SE Asia indicate a complete stratigraphic sequence at this level in shallow-marine sequences on intra-Tethyan Cathaysian tectonic blocks (South China) and in deep-marine Palaeo-Tethyan sediments (cherts of the Inthanon suture zone, Thailand). However, in shallow-marine sequences on the Sibumasu Block, located on the NE margin of Gondwana in the Carboniferous, they demonstrate a non-sequence or unconformity at this level, also seen elsewhere in Gondwana. Biogeographic links between upper Tournaisian and early Visean conodonts on the Sibumasu Terrane and Laurentia and Eastern Australian Gondwana support a NW Australian Gondwana margin position for Sibumasu in the Late Palaeozoic. |
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