PLATE TECTONICS VS. PLUME TECTONICS INTERPLAY: POSSIBLE MODELS AND TYPICAL CASES
N.L. Dobretsov1,2
1Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
2Novosibirsk State University, ul. Pirogova 1, Novosibirsk, 630090, Russia
Keywords: Plate tectonics, plume tectonics, seismic tomography, gravity field, lower mantle, core, models of lower mantle plumes, plume magmatism, compression, extension
Abstract
The interplay of plume and plate tectonics is discussed with reference to well-documented late Paleozoic and Mesozoic-Cenozoic structures. The considered issues include models of lower mantle plumes; the typical case of the Hawaii plume; plate motions in the Pacific basin under the effect of plume activity and subduction processes; the role of plumes in the breakup of continents and rifting for the cases of the East African rifts and Gondwana breakup; large continental igneous provinces of Siberia and Tarim, with meimechites and kimberlites; and the formation of large granitic batholiths and related metallogeny. The study contains several points of novelty: integrated use of lower mantle seismic tomography and satellite altimetry data on gravity patterns; correlation of plume heat with plate velocities assuming that some plumes may dissolve in the asthenosphere; and correlation of rifting with compression and extension zones.
DOI: 10.15372/RGG2020102
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