Analysis of laminated sediments from Lake DV09, northern Devon Island, Nunavut, Canada
A 147cm sediment core from Lake DV09, northern Devon Island, Nunavut, Canada (75° 34'34"N, 89° 18'55"W) contains annually-laminated (varved) sediments, providing a 1600-year record of climate variability. A minerogenic lamina deposited during the annual thaw period and a thin dep...
| Main Author: | |
|---|---|
| Format: | Thesis |
| Language: | English |
| Published: |
Université d'Ottawa / University of Ottawa
2009
|
| Subjects: | |
| Online Access: | https://dx.doi.org/10.20381/ruor-19098 http://www.ruor.uottawa.ca/handle/10393/28123 |
| Summary: | A 147cm sediment core from Lake DV09, northern Devon Island, Nunavut, Canada (75° 34'34"N, 89° 18'55"W) contains annually-laminated (varved) sediments, providing a 1600-year record of climate variability. A minerogenic lamina deposited during the annual thaw period and a thin deposit of organic matter deposited during the summer and through the winter, together form a clastic-organic couplet each year. The thinnest varves occur from AD800-1050, and the thickest from AD1100-1300, during the Medieval Warm Period. The relative sediment density is also highest during this period suggesting increased sediment transport energy. The coldest period of the Little Ice Age appears to be during the AD 1600s. Varve widths over the past century indicate climate warming in the region. |
|---|