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Horse (geology) : ウィキペディア英語版 | Horse (geology)
Horse is the geological technical term used for any block of rock completely separated from the surrounding rock either by mineral veins or fault planes. In mining the term refers to a block of country rock entirely encased within a mineral lode.〔(Butler, F.H. 1911. The brecciation of mineral veins. )〕 In structural geology the term was first used to describe the thrust-bounded imbricates found within a thrust duplex.〔Dennis, J.G. 1967. International tectonic dictionary. AAPG Memoir 7, 196pp.〕 In later literature it has become a general term for any block entirely bounded by faults, whether the overall deformation type is contractional, extensional or strike-slip in nature.〔(Root, K.G. 1990. Extensional duplex in the Purcell Mountains of southeastern British Columbia. Geology, 18, 419-421 )〕〔(Laney, S.E. & Gates, A.E. 1996. Three-dimensional shuffling of horses in a strike-slip duplex: an example from the Lambertville sill, New Jersey, Tectonophysics, 258, 53-70. )〕 ==References==
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