Meters composite depth (mcd) versus a relative paleointensity (RPI) proxy (NRM/ARM) from Integrated Ocean Drilling Program (IODP) Site U1306
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
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PANGAEA
2021
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| _version_ | 1867171872056016896 |
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| author | Channell, James E T Wright, James D Mazaud, Alain Stoner, Joseph S |
| author_facet | Channell, James E T Wright, James D Mazaud, Alain Stoner, Joseph S |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The data comprise meters composite depth (mcd) versus a relative paleointensity (RPI) proxy from Integrated Ocean Drilling Program (IODP) Site U1306 drilled on the crest of the Eirik Drift (SW Greenland) in 2272 m water depth. The RPI proxy is natural remanent magnetization (NRM) normalized by anhysteretic remanent magnetization (ARM). The NRM/ARM paleointensity proxy was calculated as a slope over the 20-60 mT peak field demagnetization range. Also listed are the correlation coefficients (r) representing the definition of the slopes. NRM and ARM were measured on a pass-through u-channel magnetometer (see Channell et al., 2014). Planktic oxygen isotope (δ18O) and RPI data are used in tandem to generate an age model for the last 1 Myr from Integrated Ocean Drilling Program (IODP) Site U1306 drilled on the crest of the Eirik Drift (SW Greenland) in 2272 m water depth. For the 1-1.5 Ma interval, the age model is based on RPI alone due to insufficient foraminifera for isotope analyses. Utilizing RPI and δ18O in tandem allows recognition of low-δ18O "events" prior to glacial Terminations I, III, IV, V, VII, VIII, IX and X, that are independently supported by radiocarbon dates through the last deglaciation, and are attributed to local or regional surface-water effects. At Site U1306, Quaternary sedimentation rates (mean ~15 cm/kyr) are elevated during peak glacials and glacial onsets, and are reduced during interglacials, in contrast to the pattern at Site U1305 in 3460 m water depth at the distal toe of the drift, 191 km SW of Site U1306. The contrasting sedimentation-rate pattern appears to hold for the entire ~1.5 Myr record. The slackening and/or shoaling (due to lowered salinity) of the Deep Western Boundary Current (DWBC) during glacial intervals coincided with greater sediment supply to Site U1306 whereas the deepening, and possibly increased vigor, of the DWBC during interglacial intervals boosted sediment supply to Site U1305. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_926662 |
| institution | PANGAEA |
| language | en |
| publishDate | 2021 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Meters composite depth (mcd) versus a relative paleointensity (RPI) proxy (NRM/ARM) from Integrated Ocean Drilling Program (IODP) Site U1306 Channell, James E T Wright, James D Mazaud, Alain Stoner, Joseph S 303-U1306; Calculated; COMPCORE; Composite Core; Correlation coefficient; Deep Western Boundary Current; DEPTH, sediment/rock; Eirik Drift; Exp303; Joides Resolution; Natural remanent magnetization/anhysteretic remanent magnetization ratio; North Atlantic; North Atlantic Climate 1; Northwest Atlantic; Oxygen isotopes; Quaternary; relative paleointensity; see Channell et al. (2014) The data comprise meters composite depth (mcd) versus a relative paleointensity (RPI) proxy from Integrated Ocean Drilling Program (IODP) Site U1306 drilled on the crest of the Eirik Drift (SW Greenland) in 2272 m water depth. The RPI proxy is natural remanent magnetization (NRM) normalized by anhysteretic remanent magnetization (ARM). The NRM/ARM paleointensity proxy was calculated as a slope over the 20-60 mT peak field demagnetization range. Also listed are the correlation coefficients (r) representing the definition of the slopes. NRM and ARM were measured on a pass-through u-channel magnetometer (see Channell et al., 2014). Planktic oxygen isotope (δ18O) and RPI data are used in tandem to generate an age model for the last 1 Myr from Integrated Ocean Drilling Program (IODP) Site U1306 drilled on the crest of the Eirik Drift (SW Greenland) in 2272 m water depth. For the 1-1.5 Ma interval, the age model is based on RPI alone due to insufficient foraminifera for isotope analyses. Utilizing RPI and δ18O in tandem allows recognition of low-δ18O "events" prior to glacial Terminations I, III, IV, V, VII, VIII, IX and X, that are independently supported by radiocarbon dates through the last deglaciation, and are attributed to local or regional surface-water effects. At Site U1306, Quaternary sedimentation rates (mean ~15 cm/kyr) are elevated during peak glacials and glacial onsets, and are reduced during interglacials, in contrast to the pattern at Site U1305 in 3460 m water depth at the distal toe of the drift, 191 km SW of Site U1306. The contrasting sedimentation-rate pattern appears to hold for the entire ~1.5 Myr record. The slackening and/or shoaling (due to lowered salinity) of the Deep Western Boundary Current (DWBC) during glacial intervals coincided with greater sediment supply to Site U1306 whereas the deepening, and possibly increased vigor, of the DWBC during interglacial intervals boosted sediment supply to Site U1305. |
| title | Meters composite depth (mcd) versus a relative paleointensity (RPI) proxy (NRM/ARM) from Integrated Ocean Drilling Program (IODP) Site U1306 |
| topic | 303-U1306; Calculated; COMPCORE; Composite Core; Correlation coefficient; Deep Western Boundary Current; DEPTH, sediment/rock; Eirik Drift; Exp303; Joides Resolution; Natural remanent magnetization/anhysteretic remanent magnetization ratio; North Atlantic; North Atlantic Climate 1; Northwest Atlantic; Oxygen isotopes; Quaternary; relative paleointensity; see Channell et al. (2014) |
| url | https://doi.org/10.1594/PANGAEA.926662 |