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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Clay Mineral Investigations of Cretaceous and Quaternary Deep Sea Sediments of the North American Basin
Marian B. Jacobs
ABSTRACT
Clay mineral studies have been undertaken on Pleistocene-Recent and Cretaceous (Maestrichtian) sediments from the outcrop area of seismic reflector Horizon A in the North American Basin. In Quaternary sediments, chlorite is more abundant than kaolinite; in Cretaceous sediments, chlorite is diminished. Development of zeolites, clinoptilolite and phillipsite, along with increase in abundance of montmorillonite indicate that devitrification of ash has been an active diagenetic process in Cretaceous sediments. Changes in kaolinite and chlorite abundances across the disconformable contact between Cretaceous and Quaternary sediments may be due to climatic differences or to a change in sediment source.
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