Primary and diagenetic carbonates in the anoxic sediments of Lake Bosumtwi, Ghana
Journal Article
·
· Geology; (United States)
Cores of organic-rich muds from the tropical meteorite crater Lake Bosumtwi, Ghana, contain laminae of authigenic calcite polyhedra and aragonite needles, as well as scattered diagenetic calcite, Mg-calcite spherulites, and aggregates of dolomite crystals. Their respective origins are traced by analyses of oxygen and carbon stable isotopes. Anoxic dolomite and Mg-calcite formed in pore waters reflecting highest degrees of evaporative concentration and high rates of methanogenesis. Carbon dioxide reduction must have been the dominant methanogenic pathway, producing diagenetic carbonates with ..delta../sup 13/C values up to + 27% PDB. This example shows the inherent problems of interpreting bulk samples with progressive mineralogical sequences of calcite to Mg-calcite to aragonite to dolomite merely in terms of Mg/sup 2 +//Ca/sup 2 +/ in lake waters. It provides a model for the interpretation of ancient lacustrine carbonates from organic-rich environments.
- Research Organization:
- Universitetet i Bergen, Norway
- OSTI ID:
- 5754825
- Journal Information:
- Geology; (United States), Journal Name: Geology; (United States) Vol. 14:11; ISSN GLGYB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
03 NATURAL GAS
030200* -- Natural Gas-- Reserves
Geology
& Exploration
AFRICA
ALKALINE EARTH METAL COMPOUNDS
ALKANES
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
DEVELOPING COUNTRIES
DIAGENESIS
DOLOMITE
GEOLOGIC DEPOSITS
GEOLOGIC MODELS
GHANA
HYDROCARBONS
LAKES
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
METHANE
MINERAL RESOURCES
MINERALOGY
MINERALS
NATURAL GAS DEPOSITS
ORGANIC COMPOUNDS
ORGANIC MATTER
OXIDES
OXYGEN COMPOUNDS
REDUCTION
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SEDIMENTS
SURFACE WATERS
SYNTHESIS
030200* -- Natural Gas-- Reserves
Geology
& Exploration
AFRICA
ALKALINE EARTH METAL COMPOUNDS
ALKANES
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
DEVELOPING COUNTRIES
DIAGENESIS
DOLOMITE
GEOLOGIC DEPOSITS
GEOLOGIC MODELS
GHANA
HYDROCARBONS
LAKES
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
METHANE
MINERAL RESOURCES
MINERALOGY
MINERALS
NATURAL GAS DEPOSITS
ORGANIC COMPOUNDS
ORGANIC MATTER
OXIDES
OXYGEN COMPOUNDS
REDUCTION
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SEDIMENTS
SURFACE WATERS
SYNTHESIS