Continental Growth During Formation of Rodinia at 1.35-0.9 Ga |
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| Institution: | 1. Department of Earth and Environmental Science, New Mexico Tech, Socorro, NM 87801, USA;1. GFZ German Research Centre for Geosciences, Telegrafenberg, Potsdam 14473, Germany;2. Institute of Geological Sciences, Freie Universität Berlin, Malteserstr 74-100, Berlin 12249, Germany;3. Institute of Applied Geosciences Technische Universität Berlin, Ackerstraβe 76, Berlin 13355, Germany;4. Institute of Applied Geosciences, Graz University of Technology, Rechbauerstraβe 12, 8010 Graz, Austria;1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029 Beijing, China;2. College of Earth Sciences, University of Chinese Academy of Sciences, 100049 Beijing, China;3. GeoZentrum Nordbayern, Universität Erlangen-Nürnberg, Schlossgarten 5a, 91054 Erlangen, Germany;4. Laboratory of Isotope Geochemistry, Wuhan Centre of China Geological Survey, 430205 Wuhan, China;5. China Minmetals Corporation, 100010 Beijing, China;6. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;1. School of Earth Sciences, State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China;2. ARC Centre of Excellence for Core to Crust Fluid Systems and GEMOC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, NSW 2109, Australia;3. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;4. School of Earth Sciences, Damghan University, Damghan 36716-41167, Iran;1. Department of Earth and Environmental Science, New Mexico Tech, Socorro, NM 87801, USA;2. Institute of Meteoritics, University of New Mexico, Albuquerque, NM 87131, USA |
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| Abstract: | Nd isotopic data and U/Pb zircon ages suggest that only 7–13% of continental crust was formed between 1.35 to 0.9 Ga. Calculated crustal production rates during this time fall within the 1.1 km3/y average production rate of continental crust. This distribution of juvenile continental crust supports the existence of only two major superplume events at 2.7 and 1.9 Ga, and one or two minor events in the Phanerozoic at about 300 and 110 Ma. The absence of a 1.35-0.9 Ga juvenile crust peak may be related to supercontinent history. Results of this study confirm that although both the supercontinent and superplume cycles are episodic, each cycle can operate independently of the other. |
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