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The AAPG/Datapages Combined Publications Database
West Texas Geological Society
Abstract
The Nature and Distribution of Clays in the Flysch Sequences of the Marathon Basin; an X-Ray Diffraction and Scanning Electron Microscopic (SEM) Study
Abstract
The flysch sequences of the Marathon Basin are composed of both allogenic and authigenic clays represented by an assemblage dominated by illite, chlorite, kaolinite and micas. These clays are common in both arenaceous and argillaceous flysch units. Illites from bedded argillaceous units, when observed under SEM, have a delicate crystal morphology suggesting diagenetic transformation. Kaolinite is more common in arenaceous flysch where it occurs as stacks of pseudohexagonal platelets. These kaolinites indicate a diagenetic origin in a well-drained, acid environment. Lithoclasts, largely of argillaceous and micritic rock fragments, are also fairly common in the Marathon flysch units. Their texture and distribution add to the earlier suggestion that the sources of carbonate and siliciclastic flysch in the area were not the same.
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