Biochronology and geochronology of Late Neogene Central Arctic deep-sea cores
Microfaunal and foraminifera1 oxygen isotope data from the Chukchi Plateau, the Alpha-Mendeleev Rise and the Lomonosov Ridge deep-sea cores (Table 1) representing the last 4.5-5 million years, yield evidence of significant paleoceanographic and paleoclimatic changes. Uranium series isotopes and magn...
| Published in: | Polar Research |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Norwegian Polar Institute
1987
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| Subjects: | |
| Online Access: | https://polarresearch.net/index.php/polar/article/view/2469 https://doi.org/10.3402/polar.v5i3.6897 |
| Summary: | Microfaunal and foraminifera1 oxygen isotope data from the Chukchi Plateau, the Alpha-Mendeleev Rise and the Lomonosov Ridge deep-sea cores (Table 1) representing the last 4.5-5 million years, yield evidence of significant paleoceanographic and paleoclimatic changes. Uranium series isotopes and magnetic stratigraphy provide the time frame for these Late Neogene sequences (Herman & Osmond 1984). The similarity in faunal and floral patterns as well as in lithology allows cor- .relation of cores over widely separated regions. Several datum levels were recognized. They include the Globigerina egelida acme zone between -1.8 and -1.6Ma, the Globigerina quinqueloba acme zone 0.7 Ma and -0.34-0.24 Ma, the Stetsonia horuarhi acme zone between -1.66 and - 1 Ma and the Orthopithonella acme zone between -1.66 and -0.73 Ma (Fig. 1). |
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