Eocene-Oligocene coals of the Gippsland and Australo-Antarctic basins – Paleoclimatic and paleogeographic context and implications for the earliest Cenozoic glaciations
| Autor: | Guy R. Holdgate, Ian R. K. Sluiter, Jessica Taglieri |
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| Rok vydání: | 2017 |
| Předmět: |
010504 meteorology & atmospheric sciences
Context (language use) Structural basin 010502 geochemistry & geophysics Oceanography medicine.disease_cause complex mixtures 01 natural sciences Paleontology Pollen otorhinolaryngologic diseases medicine Coal Glacial period Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences Earth-Surface Processes Palynology business.industry technology industry and agriculture Coal mining respiratory system respiratory tract diseases business Cenozoic Geology |
| Zdroj: | Palaeogeography, Palaeoclimatology, Palaeoecology. 472:236-255 |
| ISSN: | 0031-0182 |
| Popis: | Australia's Gippsland Basin contains a semi-continuous Eocene-Oligocene (41.5–28.4 Ma) near-coastal coal record that formed adjacent to Pacific Ocean. Traralgon and Morwell Formation brown coals include 4 main seams (T2, T1, T0, M2). Coal seam palynology records show late Middle Eocene (T2) coals formed under megathermic conditions characterized by high-gymnosperm contents, Late Eocene (T1) coals formed under mesothermic conditions characterized by reduced-gymnosperm contents and earliest indications of palaeoclimate cooling. Earliest Oligocene T0 coal record (33.9–31.5 Ma) contains high-gymnosperm palynology profile, very similar to the T2 coals. The earliest indication of cooler climes only begins after this coal formed as indicated by low-gymnosperm high-Nothofagus (southern beech) pollen proportions. We suggest in Gippsland the earliest evidence for major glacial cooling (by inference the Oi1 event) be placed immediately above the T0 coal seam where Early to Late Oligocene Morwell Formation sands, clays and coals contain low counts of gymnosperms ( A number of contemporaneous Middle to Late Eocene brown coals occurred in near-coastal settings across 1200 km of southern Australia. Palaeogeographically, all these coal basins faced the Australo-Antarctic Gulf and have a much lower gymnosperm proportion ( |
| Databáze: | OpenAIRE |
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