An investigation of salt tectonic structural styles in the Scotian Basin, offshore Atlantic Canada: 2. Comparison of observations with geometrically complex numerical models

作者：Albertz Markus^*; Beaumont Christopher

来源：Tectonics, 2010, 29: TC4018.

DOI：10.1029/2009TC002540

Having established the first-order controls of the three primary salt tectonic structural styles of the Scotian Basin in paper 1, in this paper (paper 2) we investigate and show that many unexplained structures can be attributed to more complex initial geometries of the autochthonous salt basins than the simple rectangular shapes used in paper 1. Basement highs modify and reduce the efficiency of salt evacuation during sediment aggradation followed by progradation. Low-angle taper (similar to 3 degrees) of the basin edge slows Poiseuille flow and allows for trapping of salt beneath distal salt sheets. Seaward basement step ups do not necessarily hinder salt flow, and basement step downs can localize diapirs. Midbasin salt sheets can emerge when basement blocks as high as the salt is thick divide a basin into two subbasins. Deep salt basins that form above basement lows are efficiently evacuated. Weak overburden sediments augment the formation of salt sheets. Citation: Albertz, M., and C. Beaumont (2010), An investigation of salt tectonic structural styles in the Scotian Basin, offshore Atlantic Canada: 2. Comparison of observations with geometrically complex numerical models, Tectonics, 29, TC4018, doi:10.1029/2009TC002540.

• 出版日期2010-8-4