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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 24 (1954)No. 4. (December), Pages 255-262

Diagenesis of Pennsylvanian Limestones, Upper Pecos Valley, New Mexico

Raymond Sidwell, G. Frederick Warn

ABSTRACT

Three varieties of limestone are distinguished: (1) microcrystalline or granular, more than 50 percent of the rock granular; (2) crystalline, composed mainly of sutured anhedra; (3) fragmental, consists chiefly of calcite fragments, quartz grains, and organic remains. Limestones especially susceptible to metasomatic replacement include the medium-bedded crystalline and fragmental varieties. Thin sections and photomicrographs show that diagenesis of various constituents follows a definite sequence: (1) for carbonates, aragonite or calcite to calcite to dolomite; (2) for silica, opal to chalcedony to quartz. Metasomatic materials are derived in part from associated sediments and in part from the host rocks.


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