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Gravity spreading : ウィキペディア英語版 | Gravity spreading Gravity spreading is the phenomenon in which a geological body laterally extends and vertically contracts, in order to reduce its gravitational potential energy.〔Schultz-Ela, D. D. (2001). Excursus on gravity gliding and gravity spreading. Journal of Structural Geology 23, p. 725-731.〕 It has been observed on many different scales, and at numerous locations on Earth, from rhyolite lava flows to passive margins.〔Smith, J. V., Houston, E. C. (1994). Folds produced by gravity spreading of a banded rhyolite lava flow. Journal of Volcanology and Geothermal Research 63, p. 89-94.〕〔Rowan, M. G., Peel, F. J., Vendeville, B. C. (2004). Gravity-driven Fold Belts on Passive Margins. AAPG Memoir 82, p. 157-182〕 Additionally, gravity spreading is thought to have occurred on both Mars and Venus.〔Montgomery, D. R., Som, S. M., et al. (2009). Continental-scale salt tectonics on Mars and the origin of Valles Marineris and associated outflow channels. GSA Bulletin 121, p. 117-133〕〔Kozak, R. C., Schaber, G. G. (1986). Gravity-spreading origin of the Venusian Tesserae. Lunar and Planetary Institute 17, p. 444-445〕 == Distinction from Gravity Gliding == Historically, the terms "gravity spreading" and "gravity gliding" have been used with little distinction between the two, or even interchangeably. This page follows the convention of "Excursus on gravity gliding and gravity spreading" by D.D. Schultz-Ela, where gravity spreading is defined as a lateral extension and vertical contraction, and thus must be applied to a non-rigid body.〔 Gravity gliding, meanwhile, is applied to a block which is not being deformed, and is therefore less common to observe. However, it can be difficult to distinguish between the two in real world scenarios, and often both are occurring simultaneously.
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