File:The Quarterly journal of the Geological Society of London (13937403802).jpg
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[edit]DescriptionThe Quarterly journal of the Geological Society of London (13937403802).jpg |
542 MAJOK-GENERAL C. A. M'MAHON ON THE HOBXBLENDE-SCHISTS The facts seem to lead naturally to this conclusion, and I do not see how it can be avoided. This being so, the further inferences seem natural that the eruptions of diorite and granite in the cliff at Kennack Cove belong to the same period as the intrusions of diorite and granite into the rocks on the Kennack foreshore, and that the injection of the dioritic rocks at Kennack Cove, in the form of quasi- banding, took place during the same period. If the rocks of the "granulitic" group at Kennack Cove and Cavouga were injected with granite subsequent to the intrusion of the por- phyritic diorite, the same conclusion holds good for those on the sea-shore at Holestrow, Pentreath, and under Yellow Cam: but the question remains whether the bedded " granulite " at Pen Yoose and in that neighbourhood ought not to be separated from them, and whether both series, viz. the Pen-Yoose " granulites " and the Kennack and Holestrow rocks of " granulitic " aspect, were injected with granite during the same or at different periods. On these points I think it prudent to suspend judgment for the present. There are several matters connected with these questions that require elucidation. Faults are so abundant along the coast of the Lizard that the apparent relation of the " granulitic " rocks to the horn- blende-schists differs materially in different places. One more exposure requires to be briefly noted. At the north end of Kildown Cove three strips of the "granulitic" group are to be seen in serpentine cutting across the root of the Eny's Head under circumstances that give colour to Air. SomervaiFs theory that the "granulitic" rocks have intruded into the serpentine. Prof. Bonney's explanation of this section is that the serpentine is intrusive in the " granulitic " group. My own view is that the position of the " granulitic" rocks here is due to faulting. The more westerly of the three strips has the appearance of being faulted against the serpentine ; for a broad dyke of gabbro that strikes at the "granulite " at a high angle ends sharply at the " granulite " and does not reappear in the serpentine on the other side, which it would surely do if the " granulite " had been erupted through the serpentine and its contained gabbro. The natural inference is that the gabbro is cut off by a fault. Discussion. The President noticed the revival of Bischofs views. The supposed ash-beds the late David Forbes was perhaps right in considering had been produced by lava issuing into water. Dr. G-eikie would be reluctant to accept the Author's conclusions. Though he had not examined the ground, he could not believe that the rocks there had escaped from the deformation which was so manifest throughout Cornwall. Mr. Teall commented on the complexity of the subject. The district had been examined by Dr. Bonney, and subsequently by himself, and although on some points the Author reconciledthe |
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Source | https://www.flickr.com/photos/biodivlibrary/13937403802 | ||
Author | Geological Society of London | ||
Full title InfoField | The Quarterly journal of the Geological Society of London. | ||
Page ID InfoField | 36940371 | ||
Item ID InfoField | 113696 (Find related Wikimedia Commons images) | ||
Title ID InfoField | 51125 | ||
Page numbers InfoField | Page 540 | ||
BHL Page URL InfoField | https://www.biodiversitylibrary.org/page/36940371 | ||
Page type InfoField | Text | ||
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Flickr posted date InfoField | 21 April 2014 | ||
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current | 05:37, 26 August 2015 | 1,760 × 3,200 (1.18 MB) | Fæ (talk | contribs) | == {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/13937403802 | description = 542 MAJOK-GENERAL C. A. M'MAHON ON THE HOBXBLENDE-S... |
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