About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)


Journal of Sedimentary Petrology
Vol. 37 (1967)No. 4. (December), Pages 1006-1011

X-Ray Previous HitDiffractionNext Hit Techniques Applicable to Studies of Diagenesis and Low Rank Metamorphism in Humic Sediments

George M. Griffin


X-ray Previous HitdiffractionNext Hit techniques are applicable to the study of humic materials ranging in rank Previous HitfromNext Hit lignite to recta-anthracite. Techniques for sample preparation and analysis are described. During diagenesis and low rank metamorphism, the repeat distance of the graphite-like layers decreases progressively Previous HitfromNext Hit 3.6-3.8 A in the lignite to high-volatile A bituminous group--to 3.5 A in the medium-volatile bituminous to anthracite group-to 3.35 A in meta-anthracite; this lattice collapse is related to the expulsion of volatiles. Also corresponding to the loss of volatiles Previous HitfromNext Hit planar surfaces, the c aixs dimension of crystallites increases progressively Previous HitfromNext Hit near 7 A in lignite--to near 20 A in medium to high rank coals--to 143 A in meta-anthracite. The observed changes are potentially appl cable to studies of insoluble organic residues extracted Previous HitfromNext Hit humic rich shales and other normal sediments undergoing diagenesis and low rank metamorphism.

Pay-Per-View Purchase Options

The article is available through a document delivery service. Explain these Purchase Options.

Protected Document: $10
Internal PDF Document: $14
Open PDF Document: $24