Continental-scale magmatic carbon dioxide seepage recorded by dawsonite in the Bowen-Gunnedah-Sydney basin system, eastern Australia
Journal Article
·
· Journal of Sedimentary Research, Section A: Sedimentary Petrology and Processes
OSTI ID:100735
- Australian Petroleum Cooperative Research Centre and Division of Petroleum Resources, North Ryde, New South Wales (Australia)
- Univ. of Queensland (Australia). Dept. of Earth Sciences
- Univ. of Sydney, New South Wales (Australia). Dept. of Geology and Geophysics
Dawsonite, NaAlCO{sub 3}(OH){sub 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 {delta}{sup 13}C (PDB) values range from {minus}4.0 to +4.1{per_thousand} 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 apparent, (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 CO{sub 2} 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 CO{sub 2} seepage in the Bowen-Gunnedah-Sydney basin system on a continental scale.
- OSTI ID:
- 100735
- Journal Information:
- Journal of Sedimentary Research, Section A: Sedimentary Petrology and Processes, Journal Name: Journal of Sedimentary Research, Section A: Sedimentary Petrology and Processes Journal Issue: 3 Vol. 65; ISSN JSRAEA; ISSN 1073-130X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fluid flow histories in Permo-Triass sediments of the Sydney Basin, SE Australia; isotope and fluid inclusion constraints
U/Pb geochronologic and petrologic studies in the Blue Mountains terrane, northwestern Oregon and westernmost central Idaho: implications for pre-Tertiary tectonic evolution
Fluid flow histories in Permo-Triass sediments of the Sydney Basin, SE Australia; isotope and fluid inclusion constraints
Conference
·
Mon Dec 30 23:00:00 EST 1996
·
OSTI ID:425595
U/Pb geochronologic and petrologic studies in the Blue Mountains terrane, northwestern Oregon and westernmost central Idaho: implications for pre-Tertiary tectonic evolution
Thesis/Dissertation
·
Tue Dec 31 23:00:00 EST 1985
·
OSTI ID:6409382
Fluid flow histories in Permo-Triass sediments of the Sydney Basin, SE Australia; isotope and fluid inclusion constraints
Conference
·
Sun Dec 31 23:00:00 EST 1995
· AAPG Bulletin
·
OSTI ID:6575224