File:The Quarterly journal of the Geological Society of London (13960477133).jpg
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[edit]DescriptionThe Quarterly journal of the Geological Society of London (13960477133).jpg |
CRYSTALLINE ROCKS OF THE MALVERN HILLS. 503 Dr. Irving alluded to the important difference presented by the phenomena of the shear-zones and those of the masses of the gneisses. We have no right to assume that these rocks are meta- morphic in their origin. The question of the replacement of bases is one of much interest. He explained how potash may be replaced, and gave illustrations : there would be variations in the results according to the quantity of free carbonic acid acting on the silicates. The Author, in reply, stated that he had not raised the general question as to the origin of the crystalline schists. Mr. Rutley recognized sedimentary rocks towards the south end of the chain. This appearance was simply due to more intense shearing. The rocks were more highly quartzose, the result of more intense metamorphism. The crushed rock gradually passes into the recon- structed rock. He allowed that black mica may be derived directly from hornblende, but that was not the case in the Malvern Hills. He dissented from the notion of friction-breccia. Mr. Teall's point was the kernel of the whole question. There was deformation at the margins of the zones, but not in the centre, because the rock had been reconstructed ; eyes of felspar are often seen in the most highly fohated rocks. A granular structure was characteristic of the reconstructed bands. There was no distinction between smaller and larger granite-veins. He referred to Prof. Blake's point as to the evidence of shearing in the broken hornblende crystals. Most of the questions raised were answered in thepaper. |
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Source | https://www.flickr.com/photos/biodivlibrary/13960477133 | ||
Author | Geological Society of London | ||
Full title InfoField | The Quarterly journal of the Geological Society of London. | ||
Page ID InfoField | 36940332 | ||
Item ID InfoField | 113696 (Find related Wikimedia Commons images) | ||
Title ID InfoField | 51125 | ||
Page numbers InfoField | Pl. XVI | ||
BHL Page URL InfoField | https://www.biodiversitylibrary.org/page/36940332 | ||
Page type InfoField | Illustration | ||
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Flickr tags InfoField |
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Flickr posted date InfoField | 21 April 2014 | ||
Credit InfoField |
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26 August 2015
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current | 05:41, 26 August 2015 | 1,166 × 2,096 (526 KB) | Fæ (talk | contribs) | == {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/13960477133 | description = CRYSTALLINE ROCKS OF THE MALVERN HILLS. 503 <br> Dr... |
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