EVAPORITE DIAGENESIS IN THE LOWER PURBECK BEDS OF DORSET

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Abstract
Summary: Five stages have been determined in the diagenetic history of the calcium sulphate of beds of Lower Purbeck age in Dorset, particularly by reference to abundant pseudomorphs and other relict textures and structures preserved in late-formed gypsum and in secondary silica and calcite. The weight of overburden is thought to have controlled the changes, Occurrences are described of minerals, including celestite, calciostrontianite, lutecite and quartz, remaining after the removal in solution of gypsum. A description is also given of secondary limestones which occur particularly in the Caps and Broken Beds. They are shown to be almost entirely replacements of original sulphate deposits.

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