Physical properties of sediments beneath Polar Front upwelling regions in the subantarctic South Atlantic (Hole 704A)

Abstract

The physical properties of sediments beneath an upwelling area in the southern part of the Atlantic Ocean (ODP Hole 704A) were investigated. Highly significant correlations characterize the relationship of carbonate content to bulk density (R = 0.85), carbonate content to porosity (R = 0.84), and carbonate content to impedance (R = 0.84). No relationship exists between carbonate content and compressional-wave velocity (R = 0.24), indicating that amplitude variations in impedance are primarily controlled by variations in bulk density which, in turn, are controlled by climatically driven biogenic opal and carbonate deposition. -from Authors