South African Geology
South African Geology
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In our eReader you can find the full English version of the book. Read South African Geology Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book South African Geology
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A dyke may in its course come so near the surface that the impelling force behind it is able to lift up the cover of rocks, and hence a large dome-shaped chamber becomes formed, into which the liquid rock pours and solidifies. At other places the solubility or fusibility of the rocks is more at a particular place than at others, and here the same bulging of the dykes occurs, owing to the liquid magma eating out a great chamber for itself. These expanded dykes are called laccolites.
A laccolite ...may be a single solid expansion of lava, as in the dolerite laccolites of the Insiswa at Mount Ay lift', Mount Currie, and several others on the Drakensberg plateau; smaller ones are to be seen at Cradock and Burghersdorp. Another form is where the central ex- pansion is solid, but round the edge is a fringe of con- TECTONIC GEOLOGY 115 centric dykes intruded into the sedimentary beds, which they have not had sufficient energy to convert into liquid rock. Such a case is presented by the biggest laccolite, bar one, in the world, the Bush veld laccolite in the Trans- vaal, which is 250 ml.
What to read after South African Geology?
You can find similar books in the "Read Also" column, or choose other free books by Ernest Hubert Lewis Schwarz to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
A dyke may in its course come so near the surface that the impelling force behind it is able to lift up the cover of rocks, and hence a large dome-shaped chamber becomes formed, into which the liquid rock pours and solidifies. At other places the solubility or fusibility of the rocks is more at a particular place than at others, and here the same bulging of the dykes occurs, owing to the liquid magma eating out a great chamber for itself. These expanded dykes are called laccolites.
A laccolite ...may be a single solid expansion of lava, as in the dolerite laccolites of the Insiswa at Mount Ay lift', Mount Currie, and several others on the Drakensberg plateau; smaller ones are to be seen at Cradock and Burghersdorp. Another form is where the central ex- pansion is solid, but round the edge is a fringe of con- TECTONIC GEOLOGY 115 centric dykes intruded into the sedimentary beds, which they have not had sufficient energy to convert into liquid rock. Such a case is presented by the biggest laccolite, bar one, in the world, the Bush veld laccolite in the Trans- vaal, which is 250 ml.
What to read after South African Geology?
You can find similar books in the "Read Also" column, or choose other free books by Ernest Hubert Lewis Schwarz to read onlineMoreLess
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