Passive Margins: Tectonics, Sedimentation and Magmatism
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This volume has evolved from papers written in memory of Professor David Roberts. They summarize the key findings of recent research on passive margins, from tectonics, bathymetry, stratigraphy and sedimentation, structural evolution and magmatism. Papers include analyses of the central and southern Atlantic margins of South America and Africa, papers on magmatism and extension in the NE Brazilian margin and on the Cote de Ivoire margin, rift architectures of the NW Red Sea margin, tectonics of the eastern Mediterranean margin, salt tectonics of passive margins of the Gulf of Mexico and Brazil, and papers on the NW Shelf margin of Australia. The volume provides readers with new insights into the complexities of passive margin systems that are in reality, not so passive.
Reappraisal of the magma-rich versus magma-poor rifted margin archetypes
Published:May 09, 2020
Julie Tugend, Morgane Gillard, Gianreto Manatschal, Michael Nirrengarten, Caroline Harkin, Marie-Eva Epin, Daniel Sauter, Julia Autin, Nick Kusznir, Ken McDermott, 2020. "Reappraisal of the magma-rich versus magma-poor rifted margin archetypes", Passive Margins: Tectonics, Sedimentation and Magmatism, K. R. McClay, J. A. Hammerstein
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Rifted margins are commonly defined as magma-poor or magma-rich archetypes based on their morphology. We re-examine the prevailing model inferred from this classification that magma-rich margins have excess decompression melting at lithospheric breakup compared with steady-state seafloor spreading, while magma-poor margins have inhibited melting. We investigate the magmatic budget related to lithospheric breakup along two high-resolution long-offset deep reflection seismic profiles across the SE Indian (magma-poor) and Uruguayan (magma-rich) rifted margins.
Resolving the magmatic budget is difficult and several interpretations can explain our seismic observations, implying different mechanisms to achieve lithospheric breakup and melt production for each archetype. We...