St. John, Kristen E Kudless (2010): (Table 1) Summary of general lithology in IODP Exp302 cores [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.734547
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Abstract:
The Cenozoic ice-rafted debris (IRD) history of the central Arctic is reconstructed utilizing the terrigenous coarse sand fraction in IODP 302 cores from 0 to 273 meters composite depth. This Holocene - middle Eocene quantitative record of terrigenous sand accumulation on the Lomonosov Ridge, along with qualitative information on grain texture and composition, confirms the interpretation that ice initiation (sea ice and glacial ice) occurred ~46 Ma in the Arctic, and provides a long-term pattern of Arctic ice expansion and decay since the middle Eocene. IRD mass accumulation rates range from 0 to 0.13 g/cm2/ka in the middle Eocene and from 0 to 0.36 g/cm2/ka in the Neogene. IRD mass accumulation rate (MAR) maxima in the Miocene and Pliocene cooccur with either glacial initiation or intensification in the sub-Arctic. The 46.25 Ma IRD onset in the central Arctic slightly precedes the earliest evidence of ice in the Antarctic, and compares in timing with a >1000 ppm decrease in atmospheric concentrations of CO2. The decline of pCO2 in the middle Eocene may have driven both poles across the temperature threshold that enabled the nucleation of glaciers on land and partial freezing of the surface Arctic Ocean, especially during times of low insolation.
Related to:
St. John, Kristen E Kudless (2008): Cenozoic ice-rafting history of the central Arctic Ocean: Terrigenous sands on the Lomonosov Ridge. Paleoceanography, 23, PA1S05, https://doi.org/10.1029/2007PA001483
Project(s):
Coverage:
Latitude: 87.890000 * Longitude: 137.650000
Minimum Elevation: -1251.0 m * Maximum Elevation: -1251.0 m
Event(s):
302-CompSite * Latitude: 87.890000 * Longitude: 137.650000 * Elevation: -1251.0 m * Campaign: Exp302 (Arctic Coring Expedition, ACEX) * Basis: CCGS Captain Molly Kool (Vidar Viking) * Method/Device: Composite Core (COMPCORE) * Comment: Virtual core composed of spliced cores from Holes M0002A, M0003A, M0004A and M0004C. Virtual position and water depth is calculated as the mean of all Exp302 sites.
Comment:
A hiatus of 2.2 ma exists between 135 and 140 r-mcd, and a 26-ma hiatus exists at 198 r-mcd [Backman et al., 2008; Frank et al., 2008].
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Lithology/composition/facies | Lithology | St. John, Kristen E Kudless | Visual description | General Lithology (and Lithostratigraphic Units) | |
| 2 | Depth, composite revised bottom | Depth comp r bot | rmcd | St. John, Kristen E Kudless | Revised composite depth scale is calculated by M. O'Regan (personal communication) and used by Backman et al. [2008]. | |
| 3 | Depth, composite revised top | Depth comp r top | rmcd | St. John, Kristen E Kudless | Revised composite depth scale is calculated by M. O'Regan (personal communication) and used by Backman et al. [2008]. | |
| 4 | Age, minimum/young | Age min | ka | St. John, Kristen E Kudless | see comment | From Backman et al. [2008]. |
| 5 | Age, maximum/old | Age max | ka | St. John, Kristen E Kudless | see comment | From Backman et al. [2008]. |
| 6 | Sedimentation rate | SR | cm/ka | St. John, Kristen E Kudless | Calculated | Linear Sedimentation Rate. From Backman et al. [2008]. |
| 7 | Sample comment | Sample comment | St. John, Kristen E Kudless | Average Sample Interval | ||
| 8 | Density, dry bulk | DBD | g/cm3 | St. John, Kristen E Kudless | Calculated | |
| 9 | Comment | Comment | St. John, Kristen E Kudless |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
41 data points