Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2010
|
| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.786664 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1867170463103320064 |
|---|---|
| author | Williams, Trevor J van de Flierdt, Tina Hemming, Sidney R Chung, Elena Roy, Martin Goldstein, Steven L |
| author_facet | Williams, Trevor J van de Flierdt, Tina Hemming, Sidney R Chung, Elena Roy, Martin Goldstein, Steven L |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Sediments from Ocean Drilling Program Site 1165 in the Indian Ocean sector of the Southern Ocean (off Prydz Bay) contain a series of layers that are rich in ice-rafted debris (IRD). Here we present evidence that IRD-rich layers at Site 1165 at 7, 4.8, and 3.5 Ma record short-lived, massive discharges of icebergs from Wilkes Land and Adélie Land, more than 1500 kilometers to the east of the depositional site. This distant source of icebergs is clearly defined by the presence of IRD hornblende grains with 40Ar/39Ar ages of 1200-1100 Ma and 1550-1500 Ma, ages that are not found on the East Antarctic continent in locations closer to Site 1165. This observation requires enormous amounts of detritus-carrying drifting icebergs, most likely in the form of large icebergs. These events probably reflect destabilization, surge, and break-up of ice streams on the Wilkes Land and Adélie Land margins of the East Antarctic Ice Sheet, in the vicinity of the low-lying Aurora and Wilkes Basins. They occurred under warming conditions, but each coast seems to have produced ice-rafting events independently, at different times. The data presented here constitute the first evidence of far-traveled icebergs from specific source areas around the East Antarctic perimeter. Launch of these icebergs may have happened during quite dramatic events, perhaps analogous to "Heinrich Events" in the North Atlantic. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_786664 |
| institution | PANGAEA |
| language | en |
| publishDate | 2010 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Age determination of hornblende in ODP Site 188-1165 and DSDP Hole 28-268 Williams, Trevor J van de Flierdt, Tina Hemming, Sidney R Chung, Elena Roy, Martin Goldstein, Steven L Deep Sea Drilling Project; DSDP; Ocean Drilling Program; ODP Sediments from Ocean Drilling Program Site 1165 in the Indian Ocean sector of the Southern Ocean (off Prydz Bay) contain a series of layers that are rich in ice-rafted debris (IRD). Here we present evidence that IRD-rich layers at Site 1165 at 7, 4.8, and 3.5 Ma record short-lived, massive discharges of icebergs from Wilkes Land and Adélie Land, more than 1500 kilometers to the east of the depositional site. This distant source of icebergs is clearly defined by the presence of IRD hornblende grains with 40Ar/39Ar ages of 1200-1100 Ma and 1550-1500 Ma, ages that are not found on the East Antarctic continent in locations closer to Site 1165. This observation requires enormous amounts of detritus-carrying drifting icebergs, most likely in the form of large icebergs. These events probably reflect destabilization, surge, and break-up of ice streams on the Wilkes Land and Adélie Land margins of the East Antarctic Ice Sheet, in the vicinity of the low-lying Aurora and Wilkes Basins. They occurred under warming conditions, but each coast seems to have produced ice-rafting events independently, at different times. The data presented here constitute the first evidence of far-traveled icebergs from specific source areas around the East Antarctic perimeter. Launch of these icebergs may have happened during quite dramatic events, perhaps analogous to "Heinrich Events" in the North Atlantic. |
| title | Age determination of hornblende in ODP Site 188-1165 and DSDP Hole 28-268 |
| topic | Deep Sea Drilling Project; DSDP; Ocean Drilling Program; ODP |
| url | https://doi.org/10.1594/PANGAEA.786664 |