Palynology of Selected Neogene Samples from Holes 594 and 594A, Chatham Rise

Heusser, Linda E.

doi:10.2973/dsdp.proc.90.123.1986

Cited by 6 publications

(2 citation statements)

References 24 publications

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“…Heusser (1986) looked at over 130 samples through late Miocene and younger sediments from Deep Sea Drilling Programme (DSDP) Leg 90. Heusser & van der Geer (1994) undertook a detailed study of spores and pollen recovered from 40 m of sediment dating back c. 350 000 yr at DSDP Site 594.…”

Section: Previous Workmentioning

confidence: 99%

Deep‐sea record of Pliocene and Pleistocene terrestrial palynomorphs from offshore eastern New Zealand (ODP Site 1123, Leg 181)

Mildenhall

2003

New Zealand Journal of Geology and Geophysics

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Terrestrial palynomorph assemblages of Pliocene and Pleistocene age have been recovered from ODP Site 1123 (Leg 181), 1100 km offshore from eastern New Zealand and from a water depth of 3300 m. Palynomorphs occur in such significant numbers as to allow for a greatly enhanced correlation between the orbitally tuned marine record and climatically controlled changes in terrestrial vegetation, despite a long distance from shore and a great depth.Gradual changes in the dominant pollen types from more mesothermal taxa (Nothofagus subgenus Brassospora), in the Pliocene and early Pleistocene, to less mesothermal (Nothofagus subgenus Fuscospora and podocarp conifers) taxa in the middle and late Pleistocene reflect what have been detected in shorter onshore sections. Since assemblages are regional in origin, this suggests a gradual change from warm, humid, maybe cloudy conditions to a cooler, drier climate over time superimposed upon more intense glacial/interglacial cycles. The glacial periods in this marine setting have more Halocarpus, Phyllocladus, Nothofagus subgenus Fuscospora, and Coprosma pollen relative to the interglacials.Overall, the palynomorph assemblages are derived from regional podocarp/hardwood forest vegetation from the southern part of North Island, New Zealand, with pollen and spores from a range of terrestrial environments represented in all samples. Recycling has occurred but is difficult to quantify because of the great variation in the quality of preservation and the different sources and possible modes of transport of palynomorphs to the site of deposition.Angiosperm pollen are dominated by Nothofagus, but angiosperm pollen generally are relatively sparse, while robust spores such as Cyathea, and bisaccate pollen such as Podocarpus/Prumnopitys, with the ability to float great distances, are over-represented. This over-representation is the result of a constant supply of these taxa to the deposition site despite changes in the strength and direction of the wind and water currents over the depositional site, and changes in the vegetation, climate, and rates of erosion in source areas. A gradual decrease in the rate of extinction through the section occurs up to and within the Mid-Pleistocene Climate Transition with rare, probably recycled, extinct taxa appearing later than this. These extinctions provide a biostratigraphic link to the onshore terrestrial record, and the marine record has the potential to provide accurate dates for terrestrial extinctions.

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Section: Previous Workmentioning

confidence: 99%

Deep‐sea record of Pliocene and Pleistocene terrestrial palynomorphs from offshore eastern New Zealand (ODP Site 1123, Leg 181)

Mildenhall

2003

New Zealand Journal of Geology and Geophysics

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“…6). Das Klima war w~hrend dieser Zeit wahrscheinlich eher humid und im Vergleich zu heute durch h6here durchschnittliche Temperaturen gekennzeichnet (SHACKLETON & KENNETT, 1975 (HEUSSER, 1985).…”

Section: Diskussionunclassified

Paläoklima und paläoozeanische Verhältnisse im SW-Pazifik während der letzten 6 Millionen Jahre (DSDP - Site 594, Chatham Rücken, östlich Neuseeland)

Dersch

Stein

1991

Geol Rundsch

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Direct correlation of terrestrial and marine paleoclimatic records from four glacial-interglacial cycles — DSDP site 594 Southwest Pacific

Heusser

Geer

1994

Quaternary Science Reviews

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Palynology of Selected Neogene Samples from Holes 594 and 594A, Chatham Rise

Cited by 6 publications

References 24 publications

Deep‐sea record of Pliocene and Pleistocene terrestrial palynomorphs from offshore eastern New Zealand (ODP Site 1123, Leg 181)

Deep‐sea record of Pliocene and Pleistocene terrestrial palynomorphs from offshore eastern New Zealand (ODP Site 1123, Leg 181)

Paläoklima und paläoozeanische Verhältnisse im SW-Pazifik während der letzten 6 Millionen Jahre (DSDP - Site 594, Chatham Rücken, östlich Neuseeland)

Direct correlation of terrestrial and marine paleoclimatic records from four glacial-interglacial cycles — DSDP site 594 Southwest Pacific

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