Geodynamics of late Mesozoic PGE,Au, and U mineralization in the Aldan shield,North Asian Craton |
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| Institution: | 1. Far East Geological Institute, Far East Branch of Russian Academy of Sciences, 159 Prospect 100 let Vladivostoku, Vladivostok 690022, Russia;2. School of Earth Sciences and Resources, China University of Geosciences Beijing, 29 Xueyuan Road, Beijing 100083, China;3. School of Engineering, Far Eastern Federal University, 8 Suhanova St., Vladivostok 690950, Russia;1. Czech Geological Survey, Geologická 6, 152 00 Praha 5, Czech Republic;2. ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS),Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia;3. GEMOC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia;4. Andean Geothermal Center of Excellence, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, Chile |
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| Abstract: | Late Mesozoic PGE, Au and U mineralization in the Precambrian Aldan Shield constitutes important ore deposits on the southern margin of the Siberian Craton. Here we provide an overview of the salient characteristics of these ore deposits and evaluate their regional geodynamic setting. Geological, geophysical, and geochronological data on the distribution and timing of the ultramafic and alkaline magmatism in the Aldan Shield and the associated Late Jurassic–Early Cretaceous PGE, Au, and U mineralization correlate with the convergence in the Asia-Pacific zone during the Late Mesozoic. The multistage magmatism and ore formation can be traced along the perimeter of the subducted slab now stagnant at the mantle transition zone, the flanks of which coincide with paleo-transform faults. Slab dehydration is considered to have transferred source metals through plume conduits resulting in the formation of productive ore-magmatic systems. |
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