کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4680055 | 1634904 | 2008 | 12 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A last glacial ice sheet on the Pacific Russian coast and catastrophic change arising from coupled ice–volcanic interaction A last glacial ice sheet on the Pacific Russian coast and catastrophic change arising from coupled ice–volcanic interaction](/preview/png/4680055.png)
Controversy exists over the extent of glaciation in Eastern Asia at the Last Glacial Maximum: complete ice sheet cover vs. restricted mountain icefields (an area discrepancy equivalent to 3.7 Greenland Ice Sheets). Current arguments favour the latter. However, significant last glacial ice-rafted debris (IRD) exists in NW Pacific ocean cores, which must have been sourced from a major ice sheet somewhere bordering the North Pacific. The origin of this IRD is addressed through a combination of marine core analysis, iceberg trajectory modelling and remote sensing of glacial geomorphology. We find compelling evidence for two stages of glaciation centred on the Kamchatka area of maritime southeast Russia during the last glacial, with ice extent intermediate in size between previous maximum and minimum reconstructions. Furthermore, a significant increase in iceberg flux precedes, and accompanies, a substantial marine core ash deposit at around 40 ka BP. We speculate that rapid decay of the first stage of the ice sheet may have triggered substantial volcanic activity.
Journal: Earth and Planetary Science Letters - Volume 265, Issues 3–4, 30 January 2008, Pages 559–570