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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 26 (1942)

Issue: 5. (May)

First Page: 901

Last Page: 901

Title: The Carlsbad Dolomite and the Pisolites of the Guadalupe Mountains of New Mexico: ABSTRACT

Author(s): Walter B. Lang

Article Type: Meeting abstract


Analyses show that the Permian Carlsbad formation of New Mexico is dolomite. The stratigraphic relation of the Carlsbad to other contemporaneous and contiguous deposits suggests that all ions in sea water transgressing the reef area available to form calcium carbonate precipitated to make the Capitan and Carlsbad formations. The flat-lying Carlsbad deposits were converted before burial into dolomite through contact with strong magnesian brines from the back-reef. Most of the Capitan remained unaffected. The relative position of these limestones and dolomites to contemporaneous deposits indicates a chemical sequence of deposits caused by evaporation of sea water and that organisms flourished only in congenial environments. The pisolites are of physio-chemical origin with l ttle positive evidence for organic associations. The pisolites are compared with the Carlsbad Cavern cave marbles.

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