Uploaded October 2017 | Updated September 2026, 1 day ago
This model uses two detachment surfaces of contrasting strength to produce an antiformal duplex stack with associated flexed, synclinal thrust sheets. This structural style is interpreted in all of the Earth's collisional mountain ranges at the large scale, and is common in external fold-thrust belts at the smaller scale when more than one slip surface (two separate shale horizons, for example) are present. Antiformal stacks represent huge "piles" of the same rock type in one stack, and their presence can be seen in localized gravity anomalies associated with such a thick mass of a single rock type!
This model uses two detachment surfaces of contrasting strength to produce an antiformal duplex stack with associated flexed, synclinal thrust sheets. This structural style is interpreted in all of the Earth's collisional mountain ranges at the large scale, and is common in external fold-thrust belts at the smaller scale when more than one slip surface (two separate shale horizons, for example) are present. Antiformal stacks represent huge "piles" of the same rock type in one stack, and their presence can be seen in localized gravity anomalies associated with such a thick mass of a single rock type!
