Recrystallization in living porcelaneous foraminifera (Archaias angulatis)

Textural changes without mineralogic alteration

Ian G. Macintyre, Pamela R Reid

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Mineralogic stabilization of porcelaneous foraminifera has been cited as an example of diagenesis in which chemical change occurs without any textural alteration. In contrast, our study of living specimens of a common species of this group, Archaias angulatis, indicates a sequence in which textural alteration of the magnesium calcite skeleton occurs without loss of magnesium from the test. In samples of A. angulatis from Florida Bay, Florida, skeletal rods (1-2 μm long and 0.1 μm wide) are extensively recrystallized to dense minimicrite (0.05-0.1 μm anhedral equant crystals). Both rods and minimicrite contain 9-11.5 mole % MgCO3. Micritization increases with age of the skeletons and occurs more rapidly in septal and basal walls than in lateral walls and pillars. Recrystallization could be due to change in the partial pressure of CO2 resulting from changing distributional patterns of respiration and photosynthesis of algal symbionts. Recrystallization within living foraminifera has important implications for studies of fossil diagenesis and biomineralization.

Original languageEnglish (US)
Pages (from-to)11-19
Number of pages9
JournalJournal of Sedimentary Research
Volume68
Issue number1
DOIs
StatePublished - Jan 1 1998

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skeleton
foraminifera
diagenesis
magnesium
biomineralization
pillar
symbiont
partial pressure
photosynthesis
stabilization
respiration
calcite
fossil
crystal
loss
test
chemical

ASJC Scopus subject areas

  • Geology

Cite this

Recrystallization in living porcelaneous foraminifera (Archaias angulatis) : Textural changes without mineralogic alteration. / Macintyre, Ian G.; Reid, Pamela R.

In: Journal of Sedimentary Research, Vol. 68, No. 1, 01.01.1998, p. 11-19.

Research output: Contribution to journalArticle

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