Journal article

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

Abstract

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..

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