Detrital Zircon Fission-Track Thermochronology of the Present-Day Isère River Drainage System in the Western Alps: No Evidence for Increasing Erosion Rates at 5 Ma
Abstract
:1. Introduction
2. Geological Setting
3. Previous Thermochronologic Work in the Isère River Drainage Area
4. Methods
Sample No. | River | Latitude | Longitude | Altitude | Locality |
---|---|---|---|---|---|
04MB129 | La Bonne | N 44.89758° | E 5.92480° | 745 m | near Valbonne |
04MB130 | Drac | N 44.79351° | E 5.97391° | 764 m | near Ambel |
04MB131 | Arc | N 45.55579° | E 6.25442° | 303 m | near Aiton |
04MB132 | (upper) Isère | N 45.65057° | E 6.43442° | 363 m | near Tour en Savoie |
04MB145 | Vénéon | N 45.01297° | E 6.06382° | 750 m | near Venosc |
04MB146 | La Séveraisse | N 44.78396° | E 6.06249° | 888 m | near Le Séchier |
5. Results
Sample | N | ρs (t/cm−2) | Ns | ρi (t/cm−2) | Ni | ρd (t/cm−2) | P(χ2) | Grain age range (Ma) | Central age (Ma) | ±1σ | Minimum age (Ma) | ±1σ |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Isére | 30 | 3.36 × 106 | 1,224 | 2.58 × 106 | 941 | 2.25 × 105 | 0.0 | 6.9–122.9 | 17.0 | 2.1 | 10.8 | 1.1 |
Arc | 40 | 4.31 × 106 | 2,409 | 1.99 × 106 | 1,113 | 2.26 × 105 | 0.0 | 9.1–153.5 | 28.9 | 3.6 | 11.1 | 1.0 |
Vénéon | 55 | 3.82 × 106 | 2,661 | 2.89 × 106 | 2,010 | 2.25 × 105 | 0.0 | 9.7–80.9 | 18.3 | 1.0 | 9.5 | 4.3 |
La Bonne | 36 | 5.41 × 106 | 2,564 | 1.78 × 106 | 846 | 2.27 × 105 | 0.0 | 14.9–149.8 | 44.8 | 5.0 | 19.5 | 2.4 |
La Sevèraisse | 43 | 4.41 × 106 | 2,708 | 1.56 × 106 | 955 | 2.24 × 105 | 0.0 | 8.6–157.5 | 37.3 | 3.2 | 20.5 | 3.5 |
Drac | 16 | 4.87 × 106 | 1,031 | 1.73 × 106 | 366 | 2.26 × 105 | 0.0 | 19.2–150.1 | 38.5 | 4.9 | 23.8 | 5.7 |
Merged samples * | 220 | 4.32 × 106 | 12,597 | 2.15 × 106 | 6,269 | 2.25 × 105 | 0.0 | 6.9–157.7 | 26.8 | 1.2 | 12.19 | 0.64 |
Isére at Chateauneuf ** | 100 | 5.19 × 106 | 5,059 | 5.13 × 106 | 5,007 | 2.34 × 105 | 0.0 | 8.1–145.9 | 35.7 | 2.5 | 14.1 | 1 |
6. Discussion
6.1. Comparison with Published Detrital and Bedrock AFT and ZFT Data
6.2. Exhumation Rate Estimates
6.3. Short-Term versus Long-Term Exhumation Signal
River | Short-term estimate (km/Myr) from 10 Be analyses * | Long-term estimate (km/Myr) from ZFT central age | Long-term estimate (km/Myr) from ZFT minimum age |
---|---|---|---|
Vénéon | 0.86 ± 0.16 | 0.39 ± 0.08 | 0.65 ± 0.14 |
La Bonne | 0.29 ± 0.06 | 0.18 ± 0.04 | 0.39 ± 0.08 |
Séveraisse | 0.65 ± 0.12 | 0.19 ± 0.04 | 0.27 ± 0.06 |
Drac | 0.67 ± 0.13 | 0.19 ± 0.04 | 0.30 ± 0.06 |
6.4. Increasing Erosion Rates at 5 Ma?
7. Conclusions
Acknowledgments
Conflict of Interest
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Bernet, M. Detrital Zircon Fission-Track Thermochronology of the Present-Day Isère River Drainage System in the Western Alps: No Evidence for Increasing Erosion Rates at 5 Ma. Geosciences 2013, 3, 528-542. https://doi.org/10.3390/geosciences3030528
Bernet M. Detrital Zircon Fission-Track Thermochronology of the Present-Day Isère River Drainage System in the Western Alps: No Evidence for Increasing Erosion Rates at 5 Ma. Geosciences. 2013; 3(3):528-542. https://doi.org/10.3390/geosciences3030528
Chicago/Turabian StyleBernet, Matthias. 2013. "Detrital Zircon Fission-Track Thermochronology of the Present-Day Isère River Drainage System in the Western Alps: No Evidence for Increasing Erosion Rates at 5 Ma" Geosciences 3, no. 3: 528-542. https://doi.org/10.3390/geosciences3030528