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Why Do Ri) Flanks Go Up?
Presented by Brian Oller and Janine Roza
Outline
• What is a ri6 flank? • Upli6 due to Flexural Upwarping
§ MathemaCcal Background § Model
• Other possible explanaCons • Conclusions
What is a Ri) Flank?
WHY?!?
Upli) Models
Mathema<cal Background
Model
Geological Evidence for Flexural Upwarping
• Rio Grande Ri6 ‒ Sacramento
Mountains
Model VS Mountain
Other Explana<ons
• Mechanical Unloading [Weissel and Karner, 1989] • Small-‐scale convecCon [Buck, 1986] • Fault Block TilCng [Kelley and Northrop, 1975] • Erosion and denudaCon [Gilchrist and Summerfield, 1990] • Dynamic flow stresses [Zuber and ParmenCer, 1986] • Mantle Flow [Daradich et al., 2015] • UnderplaCng [Cox, 1980]
Geological Evidence for Mechanical Unloading
Other Explana<ons
• Mechanical Unloading [Weissel and Karner, 1989] • Small-‐scale convecCon [Buck, 1986] • Fault Block TilCng [Kelley and Northrop, 1975] • Erosion and denudaCon [Gilchrist and Summerfield, 1990] • Dynamic flow stresses [Zuber and ParmenCer, 1986] • Mantle Flow [Daradich et al., 2015] • UnderplaCng [Cox, 1980]
Conclusions
• Ri6s are awesome!!! But complicated…
• Geophysicists like Flexural Upwarping
References
• Brown and Phillips [1999], Flexural ri6 flank upli6 at the Rio Grande ri6, New Mexico. Tectonics Vol. 18, No. 6, Pg 1275-‐1291 • [Weissel and Karner, 1989] Flexural Upli6 of Ri6 Flanks due to Mechanical Unloading of the Lithosphere during Extension. JGR Vol. 94 No. B10 Pg 13919-‐13950