File:The Quarterly journal of the Geological Society of London (13937362452).jpg
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[edit]DescriptionThe Quarterly journal of the Geological Society of London (13937362452).jpg |
AND BANDED CRYSTALLINE ROCKS OF THE LIZARD. 529 capillary attraction into the space (e-f). Similarly the water that had been flowing along (c-d) would find its way into the spaco below it. As a result of this slow percolation chemical action would be set up in the body of the rock between the planes of lamination. Now suppose the flow along the planes (a-b) and (c-d) Fig. 5. / were to be reestablished, the liquid in the rock above (a-b) would be drained off by (a-b) and the water in the space (e-f) would be drained by (c-d) : for the flow along (a-b) and (c-d) being more easy than in a transverse direction, the supply from (a-b) into (e-f), and from (c-d) into the space below, would decline, and the force of gravity would carry the water in (e-f) downwards into (c-d). That such periodical currents would be established in water- bearing strata adjoining the roots of active volcanoes I think highly probable. Considering the amount of water in the form of steam given off by active volcanoes, and considering the tremendously explosive character of the periodic discharges from some craters, powerful suction must, I think, follow each explosive discharge, which must affect the water-bearing strata in which the roots of volcanoes are planted. This powerful suction* and pumping action is sufficient, it seems to me, to account for a periodic capillary flow of water in strata within the range of a volcano's influence com- parable, as regards the character of the flow, with the circulation of fluids in the tissues of animal and vegetable bodies. That our ancient volcanoes did, as a matter of fact, exhibit ex- plosive action of the most powerful kind and on the most extensive scale, no one can doubt who has examined the extensive deposits of the Charnwood Forest, which range from the finest ash to coarse agglomerates in which the blocks are several feet in diameter. Prof. Bonney and others tell us that the Charn wood-Forest deposits be- long to the Archaean series ; and at all events no one will deny that they belong to a pre-Carboniferous age. In these Charnwood-Forest rocks ash predominates and lava-beds are very subordinate. Ash-beds, moreover, according to the Geo- logical Survey Keport already quoted, are to be found in abundance in Cornwall itself, and the beds that contain them are as old, according to present received opinion, as the Ordovician age. That water has flowed, or percolated, through the Lizard born- blende-schists in the direction of the banding is not altogether a matter of inference or theory. In the following illustration (fig. 6) I give a sketch taken from one of those banded hornblende-schists. The vigour of the response to this suction would, of course, depend on the porosity of the rock and the " head" of the water permeating it. Q.J.G. S. No. 179.2p |
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Source | https://www.flickr.com/photos/biodivlibrary/13937362452 | ||
Author | Geological Society of London | ||
Full title InfoField | The Quarterly journal of the Geological Society of London. | ||
Page ID InfoField | 36940358 | ||
Item ID InfoField | 113696 (Find related Wikimedia Commons images) | ||
Title ID InfoField | 51125 | ||
Page numbers InfoField | Page 527 | ||
BHL Page URL InfoField | https://www.biodiversitylibrary.org/page/36940358 | ||
Page type InfoField | Text | ||
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Flickr posted date InfoField | 21 April 2014 | ||
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current | 05:39, 26 August 2015 | ![]() | 1,166 × 2,096 (435 KB) | Fæ (talk | contribs) | == {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/13937362452 | description = AND BANDED CRYSTALLINE ROCKS OF THE LIZARD. 529... |
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