Eocene-Miocene carbon-isotope and floral record from brown coal seams in the Gippsland Basin of southeast Australia
Guy R Holdgate, Brian McGowran, Tom Fromhold, Barbara E Wagstaff, Stephen J Gallagher, Malcolm W Wallace, Ian RK Sluiter, Michael Whitelaw
GLOBAL AND PLANETARY CHANGE | ELSEVIER SCIENCE BV | Published : 2009
The carbon-isotope and palynological record through 580 m thick almost continuous brown coal in southeast Australia's Gippsland Basin is a relatively comprehensive southern hemisphere Middle Eocene to Middle Miocene record for terrestrial change. The carbon isotope δ13Ccoal values of these coals range from - 27.7‰ to - 23.2. This isotopic variability follows gymnosperm/angiosperm fluctuations, where higher ratios coincide with heavier δ13C values. There is also long-term variability in carbon isotopes through time. From the Eocene greenhouse world of high gymnosperm-heavier δ13Ccoal values, there is a progressive shift to lighter δ13Ccoal values that follows the earliest (Oi1?) glacial event..View full abstract
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Awarded by ARC Discovery Grant
We wish to acknowledge informative suggestions of David Cantrill and the substantial earlier review by Darren Grocke to the original manuscript. We acknowledge financial assistance from ARC Discovery Grant No. DP0558705 (Murray Basin) and ARC Discovery Grant No. DP0558150 (Southern Gateways). We thank the three reviewers (Christopher Swezey and two anonymous) who made helpful suggestions, and significantly improved the earlier manuscript.