| Seminar: Isotope systematics in the Mackenzie river basin, Northern Canada |
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| Subject: |
Isotope systematics in the Mackenzie river basin, Northern Canada |
| Speaker: |
Prof. Jerome Gaillardet
Institut de physique du globe de Paris (IPGP), Sorbonne Paris Cite University, France |
| Time: |
3:00 pm, Aug.24, 2012 |
| Location: |
SKLEG Lecture Hall |
| Abstract: |
The Mackenzie river basin is one of the largest river basin in North America. The basin is poorly impacted by human activities but will be submitted to important climate change during the next century. We have investigated chemical and isotopic studies in the erosion products transported by the river and its tributaries. The strontium isotopes reveal a strong heterogeneity of source composition and are very sensitive to lithology. The non-traditional isotopes such boron, lithium and magnesium display large variations, not correlated with source variations. We show that these elements are mainly derived from silicate weathering despite the low temperature conditions and the abundance of carbonate rocks. We propose new interpretations showing that these isotopic systems are controlled by weathering regimes and in particular hydrologic conditions. |
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