Composition of Pliocene to Quaternary mixed terrigenous and calcareous sandy beds in contourite drift deposits at ODP Site 1119 off New Zealand: Insights into sandy drift development and drift petroleum reservoir characterization |
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| Institution: | 1. Institute of Systematics and Ecology of Animals, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia;2. Institute of Plant and Animal Ecology, Ural Branch, Russian Academy of Sciences, Ekaterinburg, Russia;1. Department of Health Protection, National Institute for Health and Welfare, Kuopio, FI-70200, Finland;2. Department of Plastic Surgery, Helsinki University Hospital, Helsinki, Finland;3. Department of Public Health, University of Helsinki, Finland;1. Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan;2. Department of Earth and Planetary Science, University of Tokyo, Tokyo 113-0033, Japan;3. Gas Hydrate Laboratory-OSRI, Meiji University, Tokyo 214-8571, Japan;1. CESAM & Department of Chemistry, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;2. Department of Complementary Sciences, College of Health Technology of Coimbra, Rua 5 de Outubro S. Martinho do Bispo Apartado 7006, 3040-854 Coimbra, Portugal;3. BAM Federal Institute for Materials Research and Testing, Department of Analytical Chemistry, Reference Materials, Richard-Willstaetter-Str. 11, D-12489 Berlin, Germany;4. Department of Applied Chemistry and Physics, University of León, Campus de Vegazana, 24071 León, Spain;1. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan, 430074, China;2. Tianjin Branch of China National Offshore Oil Company Ltd, Tianjin, 300452, China;3. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Changping, Beijing, 102249, China;1. Radiology Department, Ninewells Hospital, Dundee DD1 9SY, UK;2. Gold Coast Radiology, Queensland, Australia |
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| Abstract: | ODP (Ocean Drilling Program) Site 1119 was drilled in drift successions deposited by northward flowing currents on the Canterbury slope, South Island, New Zealand. Pliocene (∼3.9 Ma) to Pleistocene drift accumulation was concomitant with tectonic uplift and sediment supply from the Alpine Fault plate boundary to the west, glacial development and eustatic sealevel change that created cyclicity in sandy input. Sand detrital and biogenic modes of very fine and fine sand fractions from 24 unconsolidated core samples (44 thin sections) were determined. Fine sand fractions contain an average of 52% bioclastic debris, with bioclasts making up 23% of the very fine sand fraction. Foraminifers are the dominant bioclasts, with pelagic more common than benthic varieties. The average proportions of monocrystalline quartz, plagioclase and potassium feldspar are similar in both size fractions (average QmKP of ∼25:12:63). In contrast, the very fine sand fractions have, on average, higher lithic (QFL%L of 16 vs. 3%), mica (Totalgrain%M of 10 vs. 6%), and dense mineral (Totalgrain%D of 8 vs. 5%) content as compared with the fine sand fractions. Younger clinoform drape (Unit I) and older mounded drift (Unit II) seismic facies showed no distinct detrital compositional differences in their sand fractions, though bioclast content ranges higher in the fine sand fraction of Unit II. Albite feldspar, metamorphic rock fragment, and chlorite components in the sand are consistent with a schist provenance. Other components such as biotite, plagioclase, and K-feldspar require a contribution from metasedimentary and volcanic rocks. Thus there is some along-slope mixing during sediment transport by south-to-north flowing currents. Cemented microporous sandstone at the base of the section provides some insight into contourite burial diagenesis. This work provides a better understanding of the compositional variability of sand components of drift successions which are potential hydrocarbon reservoirs elsewhere. |
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| Keywords: | Contourite Sand Sediment drift Pliocene Pleistocene New Zealand Provenance Foraminifers |
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