(Table 1) Summary of general lithology in IODP Exp302 cores
Fuente:
PANGAEA
Salvato in:
| Autore principale: | |
|---|---|
| Natura: | Dataset Open Access |
| Lingua: | en |
| Pubblicazione: |
PANGAEA
2010
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1867169023489212416 |
|---|---|
| author | St. John, Kristen E Kudless |
| author_facet | St. John, Kristen E Kudless |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_734547 |
| institution | PANGAEA |
| language | en |
| publishDate | 2010 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Summary of general lithology in IODP Exp302 cores St. John, Kristen E Kudless 302-CompSite; ACEX; Age, maximum/old; Age, minimum/young; Arctic Coring Expedition, ACEX; Calculated; CCGS Captain Molly Kool (Vidar Viking); Comment; COMPCORE; Composite Core; Density, dry bulk; Depth, composite revised bottom; Depth, composite revised top; Exp302; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Lithology/composition/facies; Sample comment; Sedimentation rate; see comment; Visual description 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. |
| title | (Table 1) Summary of general lithology in IODP Exp302 cores |
| topic | 302-CompSite; ACEX; Age, maximum/old; Age, minimum/young; Arctic Coring Expedition, ACEX; Calculated; CCGS Captain Molly Kool (Vidar Viking); Comment; COMPCORE; Composite Core; Density, dry bulk; Depth, composite revised bottom; Depth, composite revised top; Exp302; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Lithology/composition/facies; Sample comment; Sedimentation rate; see comment; Visual description |
| url | https://doi.org/10.1594/PANGAEA.734547 |