A natural example of the simultaneous operation of free-face dissolution and pressure solution

Terry Engelder

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

The dissolution of crinoid columnals during tectonic deformation of the Appalachian Plateau was enhanced by stress-induced changes of chemical potential of calcite in solution at the surface of the crinoid columnal. Pressure solution on the outside surface occurred within areas of highest normal stress developed at grain to grain contacts whereas free-face dissolution on the inside bore (the axial canal) of the columnal occurred where parts of the crystal lattice next to the surface were subject to the highest strain, as indicated by the presence of mechanical twins. For free-face dissolution, the chemical potential of the solute is affected more by the larger strain energy associated with mechanical twinning than strain energy from elastic strain prior to mechanical twinning of the crystal lattice. These observations suggest that free-face dissolution as well as pressure solution may contribute significantly to dissolution during rock deformation by diffusive mass transfer.

Original languageEnglish (US)
Pages (from-to)69-74
Number of pages6
JournalGeochimica et Cosmochimica Acta
Volume46
Issue number1
DOIs
StatePublished - Jan 1982

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology

Fingerprint Dive into the research topics of 'A natural example of the simultaneous operation of free-face dissolution and pressure solution'. Together they form a unique fingerprint.

Cite this