Planktonic Foraminifera from the Deep-Sea Cores of the Indian Ocean
Of the eight piston cores from the deep-sea floor of the Indian Ocean, two contained abundant planktonic Foraminifera. One core is composed of uniform Globigerina ooze, and other of an alternation of brown clay and Globigerina ooze interbedded with a layer of secondary deposit. The vertical changes...
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| Format: | Report |
| Language: | English |
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Tohoku University
1967
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| Online Access: | http://hdl.handle.net/10097/28793 https://tohoku.repo.nii.ac.jp/?action=repository_uri&item_id=11990 https://tohoku.repo.nii.ac.jp/?action=repository_action_common_download&item_id=11990&item_no=1&attribute_id=18&file_no=1 |
| Summary: | Of the eight piston cores from the deep-sea floor of the Indian Ocean, two contained abundant planktonic Foraminifera. One core is composed of uniform Globigerina ooze, and other of an alternation of brown clay and Globigerina ooze interbedded with a layer of secondary deposit. The vertical changes of the species in the foraminiferal assemblage in the Globigerina ooze are inferred to reflect the paleoclimate at least since the last interglacial age. Analysis of the planktonic Foraminifera show that the alternation of brown clay and Globigerina ooze were deposited during cold and warm periods, respectively. This is interpreted also by that the bathymetric change of compensation depth of calcium carbonate occurred between glacial and interglacial ages. The secondary deposits were carried by turbidity current from a shallow water region to the deep-sea floor. |
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