Mark G. Rowan, Roy Kligfield, Eric A. Erslev; Volume flux during folding in the Helvetic nappes, Switzerland. Geology ; 19 (10): 1001–1004. doi: https://doi.org/10.1130/0091-7613(1991)019<1001:VFDFIT>2.3.CO;2
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Volume loss due to pressure solution along spaced cleavage and volume gain represented by dilatant veins have been quantified for folded carbonates from the Helvetic nappes. Samples from two formations with low clay contents (<7%) record approximately equal gains and losses of between 1% and 10% and show no variations of net volume flux between backlimbs and forelimbs. In contrast, preliminary data from a third unit with higher clay content indicate net volume losses that resulted in relative thinning of the overturned forelimbs.