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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 47 (1963)

Issue: 9. (September)

First Page: 1726

Last Page: 1732

Title: Origin of Nodular and Bedded Previous HitAnhydriteNext Hit in Permian Shelf Ssdiments, Texas and New Mexico

Author(s): S. Duff Kerr, Jr. (2), Alan Thomson (2)


Studies of Previous HitanhydriteNext Hit in Permian shelf sediments of Texas and New Mexico indicate similarities to Recent gypsum deposits of Laguna Madre, coastal south Texas.

Permian Previous HitanhydriteNext Hit occurs with greatest frequency within cyclical clastic and carbonate shelf sediments. The most common form (other than of pore-filling or replacement origin) is the nodule. Nodules are packed to varying degrees, ranging from widely spaced individuals to dense zones which have been misinterpreted as "beds." Two types of truly bedded Previous HitanhydriteNext Hit occur: thin discrete layers, and laminated beds.

In Laguna Madre, rosettes, bladed crystals, and thin beds of gypsum occur below the sediment surface. Thin sheets of lagoon water periodically are blown over mud flat areas where evaporation markedly increases salinity. The concentrated brines percolate downward, supplying hypersaline ground water from which the gypsum is precipitated (Fisk, 1959).

The discovery of Permian Previous HitanhydriteTop nodules that are pseudomorphous after euhedral gypsum, and which closely resemble Recent gypsum crystals and crystal aggregates, suggests a similar mode of origin.

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