Guttulatic calcite: A carbonate microtexture that reveals frigid formation conditions

Eva L. Scheller, John Grotzinger, Miquela Ingalls

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The paragenesis of carbonate pseudomorphic textures in the rock record that are inferred to represent replaced metastable ikaite (CaCO3·6H2O), which forms at frigid temperatures, isuncertain. Petrographic analysis of Mono Lake (California, USA) Pleistocene tufas allowedrecognition of a distinctive calcite microtexture, termed guttulatic calcite, that forms duringcarbonate dehydration and is diagnostic for precursor ikaite. The texture is characterized bypseudo-hexagonal or spherical low-Mg cores, which likely formed initially as vaterite, withan ellipsoidal overgrowth, and a secondary high-Mg sparry or micritic cement.

Original languageEnglish (US)
Pages (from-to)48-53
Number of pages6
JournalGeology
Volume50
Issue number1
DOIs
StatePublished - 2022

All Science Journal Classification (ASJC) codes

  • Geology

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