Deep subduction and mantle heterogeneities |
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| Affiliation: | 1. Institute of Mineralogy, Leibniz University Hannover, Callinstr. 3, 30167 Hannover, Germany;2. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi''an 710069, China;3. State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Resources, China University of Geosciences, 430074 Wuhan, China;4. State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Geosciences, 430074 Wuhan, China;1. School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;2. Institute of Gold Geology, Chinese Armed Police Force, Langfang 065000, China;3. Centre for Exploration Targeting, School of Earth and Environment, University of Western Australia, Perth, WA 6009, Australia;4. Department of Earth and Oceans, James Cook University, Townsville, QLD, Australia;1. School of Earth Sciences, Damghan University, Damghan 36716-41167, Iran;2. State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geoscience, Wuhan 430047, China;3. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, PR China;4. Geosciences Dept. University of Texas at Dallas, Richardson, TX 75083-0688, USA;5. College of Oceanography, Hohai University, Nanjing 210093, PR China |
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| Abstract: | The globe-encircling isotopic anomaly centred on latitude 30°S defined from the geochemistry of mid-ocean ridge and particularly intraplate basalts has been previously shown to be correlative with degree-2 features of the Earth's geoid. The same region appears to show a correlation with zones of low seismic velocities, perhaps indicative of heated rocks, which persist to at least the transition zone between the upper and lower mantle. That the basalts in this anomalous region are derived by diapiric uprise from a mantle reservoir of old deeply subducted materials is favourably demonstrated by olivine and clinopyroxene-controlled partial melting trends on geochemical discrimination diagrams. |
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