Mineralogical composition of the upper 300m of Hole 302-M0002A
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| Auteurs principaux: | , , , , , , , |
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2008
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| _version_ | 1867168552495087616 |
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| author | Krylov, Alexey A Andreeva, Irina A Vogt, Christoph Backman, Jan Krupskaya, Viktoria V Grikurov, Garrik E Moran, Kathryn Shoji, Hitoshi |
| author_facet | Krylov, Alexey A Andreeva, Irina A Vogt, Christoph Backman, Jan Krupskaya, Viktoria V Grikurov, Garrik E Moran, Kathryn Shoji, Hitoshi |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | During the Arctic Coring Expedition (ACEX), a 428-m-thick sequence of Upper Cretaceous to Quaternary sediments was penetrated. The mineralogical composition of the upper 300 m of this sequence is presented here for the first time. Heavy and clay mineral associations indicate a major and consistent shift in provenance, from the Barents-Kara - western Laptev Sea region, characterized by presence of common clinopyroxene, to the eastern Laptev-East Siberian seas in the upper part of the section, characterized by common hornblende (amphibole). Sea ice originating from the latter source region must have survived at least one summer melt cycle in order to reach the ACEX drill site, if considering modern sea ice trajectories and velocities. This shift in mineral assemblages probably represents the onset of a perennial sea ice cover in the Arctic Ocean, which occurred at about 13 Ma, thus suggesting a coeval freeze in the Arctic and Antarctic regions. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_707428 |
| institution | PANGAEA |
| language | en |
| publishDate | 2008 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Mineralogical composition of the upper 300m of Hole 302-M0002A Krylov, Alexey A Andreeva, Irina A Vogt, Christoph Backman, Jan Krupskaya, Viktoria V Grikurov, Garrik E Moran, Kathryn Shoji, Hitoshi 302-M0002A; ACEX-M2A; Arctic Coring Expedition, ACEX; Arctic Ocean; CCGS Captain Molly Kool (Vidar Viking); Exp302; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP During the Arctic Coring Expedition (ACEX), a 428-m-thick sequence of Upper Cretaceous to Quaternary sediments was penetrated. The mineralogical composition of the upper 300 m of this sequence is presented here for the first time. Heavy and clay mineral associations indicate a major and consistent shift in provenance, from the Barents-Kara - western Laptev Sea region, characterized by presence of common clinopyroxene, to the eastern Laptev-East Siberian seas in the upper part of the section, characterized by common hornblende (amphibole). Sea ice originating from the latter source region must have survived at least one summer melt cycle in order to reach the ACEX drill site, if considering modern sea ice trajectories and velocities. This shift in mineral assemblages probably represents the onset of a perennial sea ice cover in the Arctic Ocean, which occurred at about 13 Ma, thus suggesting a coeval freeze in the Arctic and Antarctic regions. |
| title | Mineralogical composition of the upper 300m of Hole 302-M0002A |
| topic | 302-M0002A; ACEX-M2A; Arctic Coring Expedition, ACEX; Arctic Ocean; CCGS Captain Molly Kool (Vidar Viking); Exp302; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP |
| url | https://doi.org/10.1594/PANGAEA.707428 |