Formation of Grooved Terrain on Ganymede: Extensional Instability Mediated by Cold, Superplastic Creep

Dombard, A. J.; McKinnon, William B.

doi:10.1006/icar.2001.6728

Cited by 73 publications

(74 citation statements)

References 63 publications

(130 reference statements)

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“…Similarly, estimates of, for example, convective stresses in icy satellites indicate stresses 1 MPa; for reasonable estimates of ice grain sizes based on terrestrial analogs, one also concludes that the flow of planetary ices is limited by GBS-limited flow. Thus, the flow law for superplastic creep has been employed in successfully modeling a host of planetary ice flow phenomena, including crater relaxation on Ganymede (Dombard and McKinnon 2000), flow of the Martian polar ice caps (Nye 2000;, grooved terrain formation on Ganymede (Dombard and McKinnon 1996), convection in Europa's outer icy shell (Pappalardo et al 1998;Nimmo and Manga 2002) and flow of periglacial features on Mars (Milliken et al 2003).…”

Section: Glaciological and Planetary Implicationsmentioning

confidence: 99%

Rheological and Thermal Properties of Icy Materials

et al. 2010

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Laboratory measurements of physical properties of planetary ices generate information for dynamical models of tectonically active icy bodies in the outer solar system. We review the methods for measuring both flow properties and thermal properties of icy planetary materials in the laboratory, and describe physical theories that are essential for intelligent extrapolation of data from laboratory to planetary conditions. This review is structured with a separate and independent section for each of the two sets of physical properties, rheological and thermal. The rheological behaviors of planetary ices are as diverse as the icy moons themselves. High-pressure water ice phases show respective viscosities that vary over four orders of magnitude. Ices of CO 2 , NH 3 , as well as clathrate hydrates of CH 4 and other gases vary in viscosity by nearly ten orders of magnitude. Heat capacity and thermal conductivity of detected/inferred compositions in outer solar system bodies have been revised. Some low-temperature phases of minerals and condensates have a deviant thermal behavior related to paramount water ice. Hydrated salts have low values of thermal conductivity and an inverse dependence of conductivity on temperature, similar to clathrate hydrates or glassy solids. This striking behavior may suit the dynamics of icy satellites.

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Section: Glaciological and Planetary Implicationsmentioning

confidence: 99%

Rheological and Thermal Properties of Icy Materials

et al. 2010

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“…Dombard and McKinnon (2001) investigated the grooved terrain of Ganymede and argued that the regular structural periodicity found in this grooved terrain could be the result of an extensional necking instability. Dombard and McKinnon (2006) also argued that topographic undulation, with a ca.…”

Section: Some Applicationsmentioning

confidence: 99%

Folding and necking across the scales: a review of theoretical and experimental results and their applications

Schmalholz

Mancktelow

2016

Solid Earth

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Abstract. The shortening and extension of mechanically layered ductile rock generates folds and pinch-and-swell structures (also referred to as necks or continuous boudins), which result from mechanical instabilities termed folding and necking, respectively. Folding and necking are the preferred deformation modes in layered rock because the corresponding mechanical work involved is less than that associated with a homogeneous deformation. The effective viscosity of a layered rock decreases during folding and necking, even when all material parameters remain constant. This mechanical softening due to viscosity decrease is solely the result of fold and pinch-and-swell structure development and is hence termed structural softening (or geometric weakening). Folding and necking occur over the whole range of geological scales, from microscopic up to the size of lithospheric plates. Lithospheric folding and necking are evidence for significant deformation of continental plates, which contradicts the rigid-plate paradigm of plate tectonics. We review here some theoretical and experimental results on folding and necking, including the lithospheric scale, together with a short historical overview of research on folding and necking. We focus on theoretical studies and analytical solutions that provide the best insight into the fundamental parameters controlling folding and necking, although they invariably involve simplifications. To first order, the two essential parameters to quantify folding and necking are the dominant wavelength and the corresponding maximal amplification rate. This review also includes a short overview of experimental studies, a discussion of recent developments involving mainly numerical models, a presentation of some practical applications of theoretical results, and a summary of similarities and differences between folding and necking.

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“…Examples include fracture of the Arctic sea ice cover [2][3][4][5][6][7][8][9][10][11][12], brittle compressive failure during interactions between natural ice features and engineered structures [13,14], and tectonic activity of ice-encrusted bodies within the outer solar system [15][16][17][18][19][20][21][22][23][24]. For most of these systems, it is the friction of ice sliding upon itself that dominates the mechanics and heat generated at the interface.…”

Section: Introductionmentioning

confidence: 99%

Atomistic simulations of friction at an ice-ice interface

et al. 2013

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Even though the slipperiness of ice is important both technologically and environmentally and often experienced in everyday life, the nanoscale processes determining ice friction are still unclear. We study the friction of a smooth ice-ice interface using atomistic simulations, and especially consider the effects of temperature, load, and sliding velocity. At this scale, frictional behavior is seen to be determined by the lubricating effect of a liquid premelt layer between the sliding ice sheets. In general, increasing temperature or load leads to a thicker lubricating layer and lower friction, while increasing the sliding velocity increases friction due to viscous shear.

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Formation of Grooved Terrain on Ganymede: Extensional Instability Mediated by Cold, Superplastic Creep

Cited by 73 publications

References 63 publications

Rheological and Thermal Properties of Icy Materials

Rheological and Thermal Properties of Icy Materials

Folding and necking across the scales: a review of theoretical and experimental results and their applications

Atomistic simulations of friction at an ice-ice interface

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