X-ray Examination of some Clays from the London Platform

Abstract

X-ray analyses of Kimmeridgian clays recovered from the Warlingham Number 1 Borehole indicate that illite and kaolinite are the dominant clay minerals present. Illite, chlorite, and kaolinite, are present in the Devonian clays recovered from the Willesden Number 1 Borehole. The relationships between the clay minerals of the Kimmeridgian and Devonian clays and the clay mineral assemblage of the English Wealden is discussed.

Clay diagenesis in the Kimmeridge Clay Formation, onshore UK, and its relation to organic maturation

“…Similar results have been obtained by other workers who have studied the mineralogy of the onshore Kimmeridge Clay (Tank, 1964;Perrin, 1971;Merriman and Strong, 1979;Merriman and Jeans, 1979). Parker (1974) and Dypvik (1984) In the offshore Kimmeridge Clay section Bjorlykke etal.…”

“…Similar results have been obtained by other workers who have studied the mineralogy of the onshore Kimmeridge Clay (Tank, 1964;Perrin, 1971;Merriman and Strong, 1979;Merriman and Jeans, 1979). Parker (1974) and Dypvik (1984) Comparable diagenetic trends, in particular the decreasing expandable content of illite-smectite with increasing burial depth and the change from random to ordered illite-smectite, have been well documented in the literature (Burst, 1969, Perry andHower et al, 1976), suggesting that the reaction is commonplace in deeply buried shales.…”