The study of elastic sediments has been basic work for most geologists. Field descriptions tell the kind of rock, its color, its texture, how it is bedded, and its mineral and organic content. In the laboratory more exact mechanical and mineralogical analyses are made to add to the statistics. Among the laboratory analyses insoluble residue studies have been a valuable tool in research on the clastic sediments and the analysis of samples to determine the insoluble percentages has been systematized so that highly skilled technicians are not required to perform most of the work. As a result many thousands of samples are processed each year. The insoluble portion is often also analyzed to compute grain size, sorting, and mineral content. Unfortunately the soluble portion of the rocks has been largely neglected because of the time required in making chemical analyses. Pettijohn (1949, p. 313) has classified carbonate rocks on the ratios of calcite to dolomite in the carbonate fraction. It is suggested that a statistical analysis of the soluble portions of sandstone should be made using a modification of this classification and that a study of the cement of these elastic sediments would be an important key in the problem of the origin of dolomites which has so long been perplexing geologists.
Proceedings of the Iowa Academy of Science
©1953 Iowa Academy of Science, Inc.
Boardman, Donald C.
"The Determination of Calcium-magnesium Ratios in Sedimentary Rocks,"
Proceedings of the Iowa Academy of Science, 60(1), 330-332.
Available at: https://scholarworks.uni.edu/pias/vol60/iss1/42