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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 34 (1950)

Issue: 8. (August)

First Page: 1699

Last Page: 1717

Title: Clay Minerals of Laramie Formation, Golden, Colorado, Identified by X-ray Previous HitDiffractionNext Hit

Author(s): Arthur James Gude, 3rd (2)

Abstract:

A study of the mineralogical and lithological distribution and association of clay minerals by the X-ray Previous HitdiffractionNext Hit powder method is described. The geologic work was done at Golden, Colorado, where a complete section across the Upper Cretaceous Laramie formation was mapped, measured, and sampled in detail.

It was found possible to subdivide the Laramie into three stratigraphic intervals based on the clay-mineral assemblages identified by X-ray patterns. The upper formation boundary was confirmed, and the lower boundary was raised 65 feet Previous HitfromNext Hit interpretation of the X-ray data.

X-ray terminology and theory are presented briefly only where definitions are needed. The X-ray laboratory techniques for geological work are described.

The X-ray and geologic data are evaluated and integrated. Stratigraphic distribution of the clay minerals--laterally as well as vertically--was found to transect lithologic facies boundaries. The lithologic column of the measured section with some X-ray patterns made Previous HitfromNext Hit the rock samples is shown. Possible uses of X-ray Previous HitdiffractionNext Hit as a well-logging technique are presented.

It is concluded that X-ray Previous HitdiffractionNext Hit can be used to advantage by geologists, particularly where mixtures of clay minerals and other fine sediments can not be handled by other methods.

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