Biochemical and ultrastructural evidence for the origin of whitings: A biologically induced calcium carbonate precipitation mechanism

Journal Article · Fri May 01 00:00:00 EDT 1992 · Geology; (United States)

DOI:https://doi.org/10.1130/0091-7613(1992)020<0464:BAUEFT>2.3.CO;2· OSTI ID:7031279

Robbins, L L ^[1]; Blackwelder, P L ^[2]

---

1. Univ. of South Florida, Tampa (United States)
2. Rosenstiel School of Marine and Atmospheric Science, Miami, FL (United States)

The authors propose that Bahamian whitings, floating patches of lime mud, are in part the result of biological precipitation of calcium carbonate induced by picoplankton and cellular components. The cells may act as nucleation sites for crystallization from seawater supersaturated with CaCO{sub 3}. Their model represents a new hypothesis concerning Bahamian whiting formation and is based on several lines of evidence. Biochemical data suggest that the macromolecules from carbonate suspended in Bahama Banks whitings are distinct from those found in the lime mud sediment producer Penicillus and from bottom sediment. Direct ultrastructural evidence indicates that mineralization occurs on the surfaces of picoplankton cells and degrading organic cellular components. The organic constituents include, but are not restricted to, whole and fragmented algal cell and composite structures {approximately}20-30 {mu}m in diameter. The observed calcium carbonate crystals are distinct from skeletal debris. Because of the magnitude of the whiting phenomenon, calculations of carbonate sediment production budgets should include the potential contribution of calcium carbonate produced by epicellular precipitation. Knowledge of carbonate mud genesis is critical to interpretation of ancient occurrences of lime mud as well as to understanding ancient and global carbon cycles.

• OSTI ID: 7031279
• Journal Information: Geology; (United States), Vol. 20:5; ISSN 0091-7613
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
59 BASIC BIOLOGICAL SCIENCES
CALCITE
BIOSYNTHESIS
PRECIPITATION
PLANKTON
BIOCHEMISTRY
BIOGEOCHEMISTRY
CRYSTALLIZATION
DEPOSITION
LIMESTONE
NUCLEATION
AQUATIC ORGANISMS
CARBONATE MINERALS
CARBONATE ROCKS
CHEMISTRY
GEOCHEMISTRY
MINERALS
PHASE TRANSFORMATIONS
ROCKS
SEDIMENTARY ROCKS
SEPARATION PROCESSES
SYNTHESIS
580000* - Geosciences
550200 - Biochemistry