Potential of dinoflagellate cyst records for Quaternary climate studies in the New Zealand region

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Crouch, E.M. 2003 Potential of dinoflagellate cyst records for Quaternary climate studies in the New Zealand region . Lower Hutt: Institute of Geological & Nuclear Sciences. Institute of Geological & Nuclear Sciences science report 2003/25 31 p.

Abstract: This report summarises the results of a pilot study aimed at investigating the potential of using dinoflagellate cyst (dinocyst) records in the New Zealand region for contributing to high-resolution Quaternary climate studies. Dinocyst assemblages were recorded through a rapid interval of climate change, from glacial Marine Isotope Stage (MIS) 6 to interglacial MIS 5 (~160 to 80 kyr), in ODP Site 1123, offshore eastern New Zealand. Twenty-one samples were examined and dinocyst assemblages, along with other palynomorphs such as spores and pollen, were generally well preserved, abundant and diverse. The relative and absolute abundance of dinocysts is highest in MIS 6, with . Lower Hutt: Institute of Geological & Nuclear Sciences. Brigantedinium spp. and . Lower Hutt: Institute of Geological & Nuclear Sciences. Nematosphaeropsis labyrinthus being the dominant taxa. Moreover, the higher concentration of peridinioid and total dinocysts during the glacial suggests that, in comparison with MIS 5, increased nutrient availability in surface waters was present in MIS 6. Other dinocysts that show an affinity with cool oceanic conditions include . Lower Hutt: Institute of Geological & Nuclear Sciences. Impagidinium pallidum and . Lower Hutt: Institute of Geological & Nuclear Sciences. Selenopemphix Antarctica, while . Lower Hutt: Institute of Geological & Nuclear Sciences. Impagidinium paradoxum, I. patulum, I. plicatum, I. strialatum, I. variaseptum and . Lower Hutt: Institute of Geological & Nuclear Sciences. Spiniferites mirabilis are more common during the interglacial MIS 5. Land-derived spore and pollen microfossils are abundant in Site 1123 and notable peaks in absolute abundance are recorded during MIS 5, with two of the peaks being approximately coeval with the warmer phases of Substage 5e and 5a. This pilot study highlights the increasing potential for marine palynology to contribute to Quaternary paleoclimate research in the New Zealand region. (auth)