Age model and sediment description of DSDP Hole 90-594, Chatham Ridge east of New Zealand
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
1991
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| _version_ | 1867172220810297344 |
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| author | Dersch-Hansmann, Michaela Stein, Ruediger |
| author_facet | Dersch-Hansmann, Michaela Stein, Ruediger |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Detailed sedimentological investigations were performed on sediments from DSDP-Site 594 (Chatham Rise, east of New Zealand) in order to reconstruct the evolution of paleoclimate and paleoceanographic conditions in the Southwest Pacific during the last 6 million years. The results can be summarized as follows: (1) High accumulation rates of biogenic opal and carbonate and the dominance of smectites in the clay fraction suggest increased oceanic productivity and an equable dominantly humid climate during the late Miocene. (2) During Pliocene times, decreasing contents of smectites and increasing feldspar/quartz ratios point to an aridification in the source area of the terrigenous sediments, culmunating near 2.5 Ma. At that time, accumulation rates of terrigenous components distinctly increased probably caused by increased sediment supply due to intensified atmospheric and oceanic circulation, lowered sea level, and decreased vegetation cover. (3) A hiatus (1.45 to 0.73 Ma) suggests intensified intermediate-water circulation. (4) Major glacial/interglacial cycles characterize the upper 0.73 Ma. During glacial times, oceanic productivity and terrigenous sediment supply was distinctly increased because of intensified atmospheric and oceanic circulations and lowered sea level, whereas during interglacials productivity and terrigenous sediment supply were reduced. (5) An increased content of amphibols in the sediments of Site 594 indicates increased volcanic activities during the last 4.25 Ma. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_667464 |
| institution | PANGAEA |
| language | en |
| publishDate | 1991 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Age model and sediment description of DSDP Hole 90-594, Chatham Ridge east of New Zealand Dersch-Hansmann, Michaela Stein, Ruediger 90-594; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg90; South Pacific/CONT RISE Detailed sedimentological investigations were performed on sediments from DSDP-Site 594 (Chatham Rise, east of New Zealand) in order to reconstruct the evolution of paleoclimate and paleoceanographic conditions in the Southwest Pacific during the last 6 million years. The results can be summarized as follows: (1) High accumulation rates of biogenic opal and carbonate and the dominance of smectites in the clay fraction suggest increased oceanic productivity and an equable dominantly humid climate during the late Miocene. (2) During Pliocene times, decreasing contents of smectites and increasing feldspar/quartz ratios point to an aridification in the source area of the terrigenous sediments, culmunating near 2.5 Ma. At that time, accumulation rates of terrigenous components distinctly increased probably caused by increased sediment supply due to intensified atmospheric and oceanic circulation, lowered sea level, and decreased vegetation cover. (3) A hiatus (1.45 to 0.73 Ma) suggests intensified intermediate-water circulation. (4) Major glacial/interglacial cycles characterize the upper 0.73 Ma. During glacial times, oceanic productivity and terrigenous sediment supply was distinctly increased because of intensified atmospheric and oceanic circulations and lowered sea level, whereas during interglacials productivity and terrigenous sediment supply were reduced. (5) An increased content of amphibols in the sediments of Site 594 indicates increased volcanic activities during the last 4.25 Ma. |
| title | Age model and sediment description of DSDP Hole 90-594, Chatham Ridge east of New Zealand |
| topic | 90-594; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg90; South Pacific/CONT RISE |
| url | https://doi.org/10.1594/PANGAEA.667464 |