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Institución detectada Período Navegá Descargá Solicitá
No detectada desde sep. 1973 / hasta dic. 2023 GeoScienceWorld


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Estados Unidos

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Numerical simulations of glacial-valley longitudinal profile evolution

K.R. MacGregor; R.S. Anderson; S.P. Anderson; E.D. Waddington

Pp. 1031

Patterns of movement in rotational and translational landslides

David N. Petley; Mark H. Bulmer; William Murphy

Pp. 719

A meta-study of relationships between fluvial channel-body stacking pattern and aggradation rate: Implications for sequence stratigraphy

Luca Colombera; Nigel P. Mountney; William D. McCaffrey

Palabras clave: Geology.

Pp. 283-286

Where does the time go?: Mixing and the depth-dependent distribution of fossil ages

Rebecca C. Terry; Mark Novak

Palabras clave: Geology.

Pp. 487-490

Building up or out? Disparate sequence architectures along an active rift margin—Corinth rift, Greece

Rob L. Gawthorpe; Julian E. Andrews; Richard E.L. Collier; Mary Ford; Gijs A. Henstra; Haralambos Kranis; Mike R. Leeder; Martin Muravchik; Emmanuel Skourtsos

Palabras clave: Geology.

Pp. 1111-1114

Thermochronology links denudation of the Great Unconformity surface to the supercontinent cycle and snowball Earth

M.S. DeLucia; W.R. Guenthner; S. Marshak; S.N. Thomson; A.K. Ault

Palabras clave: Geology.

Pp. 167-170

Using bar preservation to constrain reworking in channel-dominated fluvial stratigraphy

Ellen P. Chamberlin; Elizabeth A. Hajek

Palabras clave: Geology.

Pp. 531-534

Multichronometer thermochronologic modeling of migrating spreading ridge subduction in southern Patagonia

Andrea L. Stevens Goddard; Julie C. Fosdick

Palabras clave: Geology.

Pp. 555-558

Fast cooling of normal-fault footwalls: Rapid fault slip or thermal relaxation?

Reinhard Wolff; Ralf Hetzel; István Dunkl; Aneta A. Anczkiewicz; Hannah Pomella

<jats:title>Abstract</jats:title> <jats:p>Rapid rock exhumation in mountain belts is commonly associated with crustal-scale normal faulting during late-orogenic extension. The process of normal faulting advects hot footwall rocks toward Earth’s surface, which shifts isotherms upwards and increases the geothermal gradient. When faulting stops, this process is reversed and isotherms move downwards during thermal relaxation. Owing to these temporal changes of the geothermal gradient, it is not straightforward to derive the history of faulting from mineral cooling ages. Here, we combine thermochronological data with thermokinematic modeling to illustrate the importance of syntectonic heat advection and posttectonic thermal relaxation for a crustal-scale normal fault in the European Alps. The north-south–trending Brenner fault defines the western margin of the Tauern window (Austria) and caused the exhumation of medium-grade metamorphic rocks during Miocene orogen-parallel extension of the Alps. We analyzed samples from a 2-km-thick crustal section, including a 1000-m-long drill core. Zircon and apatite (U-Th)/He ages along this transect increase with elevation from ca. 8 to ca. 10 Ma and from ca. 7 to ca. 9 Ma, respectively, but differ by only ∼1 m.y. in individual samples. Thermokinematic modeling of the ages indicates that the Brenner fault became active at 19 ± 2 Ma and caused 35 ± 10 km of crustal extension, which is consistent with independent geological constraints. The model results further suggest that the fault slipped at a total rate of 4.2 ± 0.9 km/m.y. and became inactive at 8.8 ± 0.4 Ma. Our findings demonstrate that both syntectonic heat advection and posttectonic thermal relaxation are responsible for the cooling pattern observed in the footwall of the Brenner normal fault.</jats:p>

Palabras clave: Geology.

Pp. 333-337

What drives large-scale glacier detachments? Insights from Flat Creek glacier, St. Elias Mountains, Alaska

Mylène Jacquemart; Michael Loso; Matthias Leopold; Ethan Welty; Etienne Berthier; Jasmine S.S. Hansen; John Sykes; Kristy Tiampo

<jats:title>Abstract</jats:title> <jats:p>Two large-scale glacier detachments occurred at the peaks of the 2013 and 2015 CE melt seasons, releasing a cumulative 24.4–31.3 × 106 m3 of ice and lithic material from Flat Creek glacier, St. Elias Mountains, Alaska. Both events produced highly mobile and destructive flows with runout distances of more than 11 km. Our results suggest that four main factors led to the initial detachment in 2013: abnormally high meltwater input, an easily erodible glacier bed, inefficient subglacial drainage due to a cold-ice tongue, and increased driving stresses stemming from an internal redistribution of ice after 2011. Under a drastically altered stress regime, the stability of the glacier remained sensitive to water inputs thereafter, culminating in a second detachment in 2015. The similarities with two large detachments in the Aru mountains of Tibet suggest that these detachments were caused by a common mechanism, driven by unusually high meltwater inputs. As meltwater production increases with rising temperatures, the possible increase in frequency of glacier detachments has direct implications for risk management in glaciated regions.</jats:p>

Palabras clave: Geology.

Pp. 703-707