Influence of localised igneous activity on cleat dawsonite formation in Late Permian coal measures, Upper Hunter Valley, Australia

Autor:	Alexandra N. Golab, D. R. Palamara, Paul F. Carr
Rok vydání:	2006
Předmět:	Radiogenic nuclide Permian Paleozoic Stratigraphy Geochemistry Mineralogy Detritus (geology) Geology Coal measures chemistry.chemical_compound Fuel Technology chemistry Carbonate Economic Geology Sedimentary rock Dawsonite
Zdroj:	International Journal of Coal Geology. 66:296-304
ISSN:	0166-5162
DOI:	10.1016/j.coal.2005.08.001
Popis:	Stable ( δ 13 C and δ 18 O) and radiogenic 87 Sr/ 86 Sr isotopic data have been used to investigate the origin of cleat dawsonite (NaAlCO 3 (OH) 2 ) in the Late Permian Wittingham Coal Measures of the Upper Hunter region in the Sydney Basin, New South Wales. The δ 13 C PDB values have a narrow range (− 1.7‰ to + 2.4‰), with an average of + 0.3‰, suggesting a magmatic source for the carbon. In contrast, δ 18 O SMOW values have a wide range (+ 13.6‰ to + 19.8‰), and decrease systematically with decreasing distance from a major intrusion. This systematic variation reflects establishment of localised hydrothermal cells. Water–rock interaction between fluids associated with these hydrothermal cells, and Rb-poor volcaniclastic detritus in the coal measures, produced mantle-like 87 Sr/ 86 Sr (0.705032 to 0.706464) in the dawsonite.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5726711e0764dae2f6579bad928e2e16 https://doi.org/10.1016/j.coal.2005.08.001 Zobrazit plný text záznamu Full Text from ScienceDirect