Cauldron subsidences,granitic rocks,and crustal fracturing in S. E. Australia |
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| Authors: | E Sherbon Hills |
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| Institution: | (1) University of Melbourne, Australia |
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| Abstract: | The structure and history of several Devonian cauldron-subsidences and related granitic intrusions showing evidence of sub-surface ring-fracturing in South Eastern Australia are discussed. The Marysville Igneous Complex includes fish and plant bearing beds in the Acheron Cauldron, which has a diameter of 15 miles, and contains 6000 ft. of acid lavas, with subordinate andesites and basalts. Most of the occurrences are consanguineous. The parent magma is intermediate, close to the hypersthene dacites of the region, and is believed to have been injected as a magma wedge from the east. |
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