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Abstract
Journal of Sedimentary Research, Section
A: Sedimentary Petrology and Processes
Vol. 65A (1995)No.
3. (July), Pages 522-530
Continental-Scale Magmatic Carbon Dioxide Seepage Recorded by Dawsonite
in the Bowen-Gunnedah-Sydney Basin System, Eastern Australia
Julian C. Baker (1,2), Guo P. Bai (1), P. Joe Hamilton
(1), Suzanne D. Golding (3), Jock B. Keene (4)
ABSTRACT
Dawsonite, NaAlCO3(OH)2, is widespread as a cement,
replacement, and cavity filling in Permo-Triassic sedimentary rocks of
the Bowen-Gunnedah-Sydney basin system, eastern Australia. The origin of
dawsonite in these rocks was studied by petrographic and stable isotope
analysis. Dawsonite d13C (PDB) values
range from -4.0 to +4.1% and are remarkably consistent throughout
the Bowen-Gunnedah-Sydney basin system. These values indicate either a
marine carbonate or magmatic source for carbon in the dawsonite. A magmatic
carbon source is considered more likely on the basis that (1) evidence
of and the cause for widespread marine carbonate dissolution in the sedimentary
successions are not apparen , (2) dawsonite is widespread in both marine
and nonmarine facies, (3) the region has been the site of major igneous
activity, (4) other dawsonite deposits of similar carbon isotopic composition
are linked to igneous activity, and (5) magmatic CO2 accumulations
are known in parts of the Bowen-Gunnedah. Sydney basin system. The timing
of igneous activity in the Bowen Basin constrains the timing of dawsonite
formation in the Bowen-Gunnedah-Sydney basin system to the Tertiary, consistent
with textural relationships, which indicate that dawsonite formed late
during the burial history of the Permo-Triassic sequences. The distribution
and interpreted origin of dawsonite implies magmatic CO2 seepage
in the Bowen-Gunnedah-Sydney basin system on a continental scale.
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