Stable oxygen isotope ratios of benthic and planktonic foraminifera from early Miocene sediments of DSDP Site 90-593 on the Challenger Plateau, Pacific Ocean (Table 1) ...
Oxygen isotope data are compared with relative abundances of selected planktic foraminifera through a ca. 15 m interval at DSDP Site 593 (Tasman Sea, southwest Pacific, 40°S) in which there are prominent changes in population sizes, as well as several evolutionary events. We focus on the relation be...
| Main Authors: | , , |
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| Format: | Dataset |
| Language: | English |
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PANGAEA
1995
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.682293 https://doi.pangaea.de/10.1594/PANGAEA.682293 |
| Summary: | Oxygen isotope data are compared with relative abundances of selected planktic foraminifera through a ca. 15 m interval at DSDP Site 593 (Tasman Sea, southwest Pacific, 40°S) in which there are prominent changes in population sizes, as well as several evolutionary events. We focus on the relation between faunal and climatic histories.The base of early Miocene oxygen isotope Zone Mi1b (uppermost planktic foraminiferal Zone N.6) is identified from closesampled (c. 14 kyr) isotope records of Globigerina woodi and Cibicides kullenbergi. Chronostratigraphic interpolations, using the first occurrences of Globorotalia praescitula, G. mimea and Praeorbulina curva give an age estimate of ca. 18.4 Ma (cf. 18.1 -18.3 Ma for the base of the zone at DSDP Site 608 (type level, north Atlantic, 43°N) ). Another significant benthic delta18O enrichment event, informally designated as the base of zone “Mi1c”, is identified 10 m higher in the sequence at ca. 17.8 Ma. Populations of Globoquadriau dehiscens and Globigerinoides ... : Supplement to: Scott, George H; Nelson, Campbell S; Stone, H H (1995): Planktic foraminiferal events in early Miocene Zones N.6 and N.7 at southwest Pacific DSDP Site 593: relation with climatic changes in oxygen isotope Zone Mi1b. Marine Micropaleontology, 25(1), 29-45 ... |
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