An application of the combined conglomerate‐fold test to the study of foreland basins. Palaeomagnetic results from the southeastern Ebro Basin

Abstract

The Triassic limestones of the cover of the Catalan Coastal Range display a secondary magnetization acquired after folding which took place during the Palaeogene. The exposure and subsequent erosion of these rocks during the Palaeogene resulted in the formation of conglomerates with Triassic limestone cobbles in the southeastern Ebro Basin. Palaeomagnetic data indicate that both the Triassic limestones which form the cover and the Triassic limestone cobbles from the conglomerate were remagnetized during the same time span. Thus it seems that fluids were expelled out of the margins into the basin during deformation, causing the remagnetization both in the foreland basin environment and in the folded margin. Copyright © 1989, Wiley Blackwell. All rights reserved