Sedimentary Basins: Origin, Depositional Histories, and Petroleum Systems

Role of Magmatic Evacuation in the Production of SDR Complexes at Magma-Rich Passive Margins
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Published:January 01, 2014
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CiteCitation
James Pindell, Rod Graham, Brian Horn, 2014. "Role of Magmatic Evacuation in the Production of SDR Complexes at Magma-Rich Passive Margins", Sedimentary Basins: Origin, Depositional Histories, and Petroleum Systems, James Pindell, Brian Horn, Norman Rosen, Paul Weimer, Menno Dinkleman, Allen Lowrie, Richard Fillon, James Granath, Lorcan Kennan
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Abstract
Seaward dipping reflector or SDR complexes comprise piles of individual basaltic flows and interbedded sediments that are thought to have formed subaerially at the flanks of tholeiitic shield volcanoes like those in the Afar or at larger magmatic complexes like Iceland. During the rift process, these flows subsequently acquire very steep true dips (up to 25°) almost always in the seaward direction. Past explanations for the acquisition of these dips involve progressive burial, loading and flexure by subsequent flows (e.g., Pálmason, 1980), or listric, landward-dipping faulting and magmatic dilation (Geoffroy, 2005). These factors no...
- asthenosphere
- Atlantic Ocean
- basalts
- Brazil
- continental crust
- crust
- faults
- geophysical methods
- geophysical profiles
- geophysical surveys
- igneous rocks
- lava flows
- magmas
- magmatism
- mantle
- oceanic crust
- passive margins
- plate tectonics
- reflection methods
- Santos Basin
- seismic methods
- seismic profiles
- South America
- South Atlantic
- surveys
- tholeiite
- unconformities
- volcanic rocks
- seaward-dipping reflectors