Planktonic foraminifera of ODP Site 117-722
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| Auteurs principaux: | , , |
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
1991
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| _version_ | 1867168556369575936 |
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| author | Kroon, Dick Steens, Tineke N F Troelstra, Simon |
| author_facet | Kroon, Dick Steens, Tineke N F Troelstra, Simon |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Quantitative analysis of the late Cenozoic planktonic foraminiferal record from western Arabian Sea Site 722 revealed long term trends in the history of oceanography and climate. The modern western Arabian Sea surface waters are highly influenced by the monsoonal wind system. Summer upwelling, a result of southwestern winds, occurs along the coast of Somalia which produces distinct foraminiferal assemblages which are dominated by G. bulloides d'Orbigny. Consequently, variations in the distribution record of G. bulloides through time monitor the upwelling history associated with monsoonal activities. G. bulloides was a minor constituent of the foraminiferal fauna from the bottom of the hole (~14.5 Ma) until about 8.6 Ma ago. Then a rapid shift occurred toward higher values, up to 53% at 7.4 Ma. We interpret this rapid increase as a major step in the evolution of the monsoonal history. It is either the establishment of the system or at least a strong intensification of the monsoonal winds. At 5.5 Ma a significant drop of the G. bulloides relative abundance occurred which may indicate less upwelling, or alternatively other biota may have been favored in this period. From 5.0 Ma to Recent the G. bulloides record indicates that upwelling has occurred with minor fluctuations. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_756788 |
| institution | PANGAEA |
| language | en |
| publishDate | 1991 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Planktonic foraminifera of ODP Site 117-722 Kroon, Dick Steens, Tineke N F Troelstra, Simon 117-722A; 117-722B; Arabian Sea; DRILL; Drilling/drill rig; Joides Resolution; Leg117; Ocean Drilling Program; ODP Quantitative analysis of the late Cenozoic planktonic foraminiferal record from western Arabian Sea Site 722 revealed long term trends in the history of oceanography and climate. The modern western Arabian Sea surface waters are highly influenced by the monsoonal wind system. Summer upwelling, a result of southwestern winds, occurs along the coast of Somalia which produces distinct foraminiferal assemblages which are dominated by G. bulloides d'Orbigny. Consequently, variations in the distribution record of G. bulloides through time monitor the upwelling history associated with monsoonal activities. G. bulloides was a minor constituent of the foraminiferal fauna from the bottom of the hole (~14.5 Ma) until about 8.6 Ma ago. Then a rapid shift occurred toward higher values, up to 53% at 7.4 Ma. We interpret this rapid increase as a major step in the evolution of the monsoonal history. It is either the establishment of the system or at least a strong intensification of the monsoonal winds. At 5.5 Ma a significant drop of the G. bulloides relative abundance occurred which may indicate less upwelling, or alternatively other biota may have been favored in this period. From 5.0 Ma to Recent the G. bulloides record indicates that upwelling has occurred with minor fluctuations. |
| title | Planktonic foraminifera of ODP Site 117-722 |
| topic | 117-722A; 117-722B; Arabian Sea; DRILL; Drilling/drill rig; Joides Resolution; Leg117; Ocean Drilling Program; ODP |
| url | https://doi.org/10.1594/PANGAEA.756788 |