Palynofacies,organic geochemistry and depositional environment of the Tartan Formation (Late Paleocene), a potential source rock in the Great South Basin,New Zealand |
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| Authors: | Poul Schiøler Karyne Rogers Richard Sykes Chris J Hollis Brad Ilg Dylan Meadows Lucia Roncaglia Chris Uruski |
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| Institution: | 1. GNS Science, 1 Fairway Drive, Avalon, P.O. Box 30368, Lower Hutt 5040, New Zealand;2. GNS Science, National Isotope Centre, 30 Gracefield Road, Gracefield, P.O. Box 31312, Lower Hutt 5040, New Zealand;3. School of Geography, Environment & Earth Sciences, Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand |
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| Abstract: | Detailed palynofacies analysis of sidewall core samples taken from below, within and above the Tartan Formation (Thanetian, Late Paleocene, 58.7–55.8 Ma), a potential source rock in the epeiric Great South Basin, shows that the formation is characterised by very high percentages of degraded brown phytoclasts, rare marine algae and amorphous organic matter and thereby represents a mix of terrestrial and marine kerogen. The results indicate that the formation was deposited in a marginally marine (hyposaline), proximal environment under bottom conditions that varied from anoxic to oxic along a nearshore–offshore transect. Samples from the upper part of the underlying Wickliffe Formation indicate deposition in a marginal to normal marine, proximal environment under anoxic to oxic bottom environments. The lower part of the overlying Laing Formation was deposited in an open marine, relatively distal setting under anoxic to oxic bottom environments. |
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| Keywords: | Tartan Formation Waipawa Formation Great South Basin Canterbury Basin Late Paleocene Petroleum source rock Palynofacies Geochemistry |
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