RT Journal Article
SR Electronic
T1 An intra-basinal mechanism for marine-evaporite cyclicity
JF Journal of the Geological Society
JO Journal of the Geological Society
FD Geological Society of London
SP 461
OP 464
DO 10.1144/jgs2013-062
VO 171
IS 4
A1 Van Den Belt, F. J. G.
A1 De Boer, P. L.
YR 2014
UL http://jgs.lyellcollection.org/content/171/4/461.abstract
AB Marine evaporites such as the Zechstein (Permian, NW Europe) consist of thinning-upward sulphate–halite–potash cycles whose origin is poorly understood. An intra-basinal mechanism presented here explains well their mineral composition and cycle development. It involves the progressive obstruction of ocean connections by sulphate-platform progradation, causing a chain reaction of outflow reduction and subsequent accelerated sulphate precipitation. Numerical modelling shows this to be a self-accelerating process that ultimately triggers halite and potash precipitation. Isostatic compensation of the salt load explains the formation of accommodation space for subsequent cycles, each about half the thickness of the previous cycle.