Chemostratigraphy and detrital zircon geochronology of the Neoproterozoic Khorbusuonka Group,Olenek Uplift,Northeastern Siberian platform |
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| Institution: | 1. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, 3, Koptyug ave., Novosibirsk 630090, Russia;2. Novosibirsk State University, 2, Pirogova str., Novosibirsk 630090, Russia;3. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, 3, Koptyug ave., Novosibirsk 630090, Russia;4. Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, 1А Favorsky str., Irkutsk 664033, Russia;1. School of Geography, Geology & Environment, Kingston University, Penrhyn Road, Kingston upon Thames KT1 2EE, UK;2. Camborne School of Mines, University of Exeter, Cornwall Campus, Penryn, Cornwall TR10 9FE, UK;3. Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK;4. Department of Earth and Planetary Sciences, Birkbeck College, Gower Street, London WC1E 7HX, UK;1. Department of Geological Sciences, University of Florida, 241 Williamson Hall, Gainesville, FL 32611, USA;2. School of Earth Sciences and Resources, China University of Geosciences Beijing, Beijing 100083, PR China;3. Department of Earth Sciences, The University of Adelaide, Adelaide, SA 5005, Australia;4. Department of Earth System Sciences, Yonsei University, Seoul 03722, Republic of Korea;1. SE Asia Research Group, Department of Earth Sciences, Royal Holloway University of London, Egham TW20 0EX, United Kingdom;2. Research School of Earth Sciences, Australian National University, Canberra, ACT 2601, Australia;1. Swedish Museum of Natural History, Box 50007, SE-104 05 Stockholm, Sweden;2. Department of Applied Geology, Curtin University, Perth, WA 6845, Australia;1. Federal State Institution of Science Geological Institute of Russian Academy of Sciences, Pyzhevsky lane 7, Moscow 119017, Russian Federation;2. Federal State Unitary Enterprise “A.P.Karpinsky Russian Geological Research Institute”, 74, Sredny prospect, 199106 Saint-Petersburg, Russian Federation;3. GeoSep Service, 1521 Pine Cone Road, ID 83843, USA;4. Rosneft Oil Company, Dubininskaya str., 31A, 115054 Moscow, Russian Federation;5. Institute of Earth Sciences, St.-Petersburg State University, Universitetskaya emb., 7/9, St-Petersburg, Russian Federation |
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| Abstract: | This study provides 87Sr/86Sr, δ13C and δ18O data from the best-preserved limestone and dolomite of the Ediacaran carbonate-dominated Khorbusuonka Group of the Olenek Uplift, NE Siberian Craton, as well as detrital zircon geochronological data from both underlying and overlying sandstones. The Maastakh Formation is characterized by 87Sr/86Sr ratios of ca. 0.70822 and δ13C values between + 4.8 and + 6.0‰. 87Sr/86Sr ratios in limestones of the Khatyspyt Formation are fairly uniform, ranging from 0.70783 to 0.70806. The carbon isotopic composition slowly decreases from bottom (+ 3.7‰) to top (? 0.2‰) of section. The Sr isotopic composition of the Turkut Formation varies from 0.70824 to 0.70914, value of δ13C is about zero: ? 0.7…+0.7 ‰. The youngest population of detrital zircons from Maastakh Formation indicates that these rocks were formed not later than 630 Ma. U–Pb detrital zircons data of Kessyusa Group has a single peak at about 543 Ma, which is almost identical to the earlier dating. Based on biostratigraphy and isotopic data, the Sr isotopic compositions from the Khatyspyt Formation (87Sr/86Sr = 0.70783–0.70806) represent the composition of seawater at 560–550 Ma. Such low values of 87Sr/86Sr ratio in Ediacaran water were probably caused by the quick opening of Iapetus Ocean. |
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