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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 69 (1985)

Issue: 7. (July)

First Page: 1064

Last Page: 1076

Title: Recognition of Interstitial Previous HitAnhydriteNext Hit Dissolution: A Cause of Secondary Porosity, San Andres Limestone, New Mexico, and Upper Minnelusa Formation, Wyoming

Author(s): Christopher J. Schenk, Randall W. Richardson (2)

Abstract:

Rectangular and stair-step pore reentrants in carbonate mudstones have been recognized previously as indirect evidence for Previous HitanhydriteNext Hit dissolution. In this study, direct evidence for subsurface dissolution of interstitial Previous HitanhydriteNext Hit in both dolomite grainstones and quartz sandstones includes: (1) cleavage-related dissolution fringe on Previous HitanhydriteNext Hit crystal surfaces, and (2) isolated remnants of optically continuous (formerly poikilotopic) Previous HitanhydriteNext Hit. Influenced by the prominent cleavages, the dissolution fringe on the surfaces of the Previous HitanhydriteNext Hit crystals consists of a series of sharp, right-angled projections and reentrants. Experimentally etched Previous HitanhydriteNext Hit surfaces exhibit features that directly compare to the dissolution fringe, whereas experimentally grown Previous HitanhydriteNext Hit does not.

We deduced the following sequence of Previous HitanhydriteNext Hit dissolution within dolomite grainstones and quartz sandstones. Slow incipient dissolution began along the boundaries between Previous HitanhydriteNext Hit and adjacent minerals. From these intercrystalline boundaries, solutions penetrated Previous HitanhydriteNext Hit cleavages, leading to more rapid preferential dissolution perpendicular to the more prominent cleavage planes. The widened cleavage planes, together with intercrystalline boundaries, acted as conduits for the removal of dissolved ions. In the final stage, as dissolving Previous HitanhydriteTop borders retreated toward pore throats, dissolution slowed and was, again, restricted to intercrystalline boundaries. This process was then repeated in adjacent interstices.

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