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| Main Authors: | , , , , |
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| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
1994
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| Online Access: | https://doi.org/10.1594/PANGAEA.711811 |
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| _version_ | 1867171754618650624 |
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| author | Berger, Wolfgang H Yasuda, Memorie K Bickert, Torsten Wefer, Gerold Takayama, Toshiaki |
| author_facet | Berger, Wolfgang H Yasuda, Memorie K Bickert, Torsten Wefer, Gerold Takayama, Toshiaki |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | A 2 m.y. oxygen isotope record of Globigerinoides sacculifer from the Ontong Java Plateau, based on cores from Ocean Drilling Program Leg 130, is dated by matching variations to an orbital template. The procedure allows us to present the most complete Quaternary record available for the western equatorial Pacific. The template-generating algorithm describes a balance between growth and melting of ice. Following basic Milankovitch theory, ice growth is taken as constant, while melting is taken to depend on summer insolation, current ice mass, and average past ice mass. Template settings must be changed once, between 1 and 1.2 Ma, to reflect a major shift in climate. Template fits are strikingly good over much of the record and can be used to detect and fill gaps from core breaks and other disturbances. One result of template dating is an exact age for the Brunhes-Matuyama magnetic reversal boundary, at 790+/-5 ka, as well as several other precise dates (900 ka for the middle Pleistocene climate shift; 1070, 1240, and 1450 ka for isotope stages 31, 37, and 47, respectively). Sedimentation rates fluctuate between 18 and 28 m/m.y., a ca. 400 ka cycle being the most prominent. Major anomalies arise within the transitional regime (1.2 to 1 Ma). The origin of the cycles is unknown; we propose productivity variations in the western equatorial Pacific. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_711811 |
| institution | PANGAEA |
| language | en |
| publishDate | 1994 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Stratigraphic datums from ODP Site 130-806 Berger, Wolfgang H Yasuda, Memorie K Bickert, Torsten Wefer, Gerold Takayama, Toshiaki 130-806; 130-806B; AGE; Age, dated; Age, dated, standard deviation; Comment; COMPCORE; Composite Core; Datum level; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Event label; Joides Resolution; Leg130; North Pacific Ocean; Ocean Drilling Program; ODP A 2 m.y. oxygen isotope record of Globigerinoides sacculifer from the Ontong Java Plateau, based on cores from Ocean Drilling Program Leg 130, is dated by matching variations to an orbital template. The procedure allows us to present the most complete Quaternary record available for the western equatorial Pacific. The template-generating algorithm describes a balance between growth and melting of ice. Following basic Milankovitch theory, ice growth is taken as constant, while melting is taken to depend on summer insolation, current ice mass, and average past ice mass. Template settings must be changed once, between 1 and 1.2 Ma, to reflect a major shift in climate. Template fits are strikingly good over much of the record and can be used to detect and fill gaps from core breaks and other disturbances. One result of template dating is an exact age for the Brunhes-Matuyama magnetic reversal boundary, at 790+/-5 ka, as well as several other precise dates (900 ka for the middle Pleistocene climate shift; 1070, 1240, and 1450 ka for isotope stages 31, 37, and 47, respectively). Sedimentation rates fluctuate between 18 and 28 m/m.y., a ca. 400 ka cycle being the most prominent. Major anomalies arise within the transitional regime (1.2 to 1 Ma). The origin of the cycles is unknown; we propose productivity variations in the western equatorial Pacific. |
| title | (Table 1) Stratigraphic datums from ODP Site 130-806 |
| topic | 130-806; 130-806B; AGE; Age, dated; Age, dated, standard deviation; Comment; COMPCORE; Composite Core; Datum level; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Event label; Joides Resolution; Leg130; North Pacific Ocean; Ocean Drilling Program; ODP |
| url | https://doi.org/10.1594/PANGAEA.711811 |