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V.—The Gneissose Rocks of the Himalaya
Published online by Cambridge University Press: 01 May 2009
Extract
It had not been my intention to publish anything on this subject at present, as I have in preparation a review of the present state of our knowledge of Himalayan geology; but as Col. McMahon has started the subject, and his paper is not exhaustive, I trust the following outline of that part which relates to the gneissose rocks may prove of interest.
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References
page 462 note 1 Rec. Geol. Surv. India, vol. xvii. p. 60; vol. xix. p. 86.Google Scholar
page 463 note 1 Contact metamorphism is only conspicuous in the case of large intrusive masses. The statement in the text may seem inconsistent with that of Col. MeMahon regarding the slightly metamorphosed condition of the slates in contact with the outer band of gneissose granite in the Dalhousie region; hut the particular slates referred to are everywhere characterized by a much greater power of resisting metamorphism than those above and below them. I have more than once observed the total absence of metamorphism, or the mere development of a micaceous glaze on the bedding-planes, where associated beds were converted into distinct schists.
page 464 note 1 In 1884 Colonel McMahon seems to have held an opinion somewhat similar to this (see Records Geol. Surv. India, vol. xvii. p. 72), but so far as I can understand his paper in the May Number of this Magazine, he has now abandoned it.Google Scholar