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| Biotite-glauconite transformation and associated minerals Galliher, E (1939). Biotite-glauconite transformation and associated minerals, in: Trask, P.D. Recent marine sediments: A symposium. SEPM Special Publication, 4: pp. 513-515. https://dx.doi.org/10.1306/sv10340c28
In: Trask, P.D. (1939). Recent marine sediments: A symposium. SEPM Special Publication, 4. American Association of Petroleum Geologists: Tulsa. ISBN 9781629812519. vi, 736 pp. https://dx.doi.org/10.1306/sv10340
In: SEPM Special Publication. Society of Economic Paleontologists and Mineralogists (SEPM): USA. ISSN 1060-071X
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Groups similar to it have been found in glauconitic sediments collected from about one hundred localities spread over a dozen states and countries. They are not limited to recent material alone, but range down the column as low as Cambrian. Several illustrations of such fossil biotite-glauconite associations are in preparation. In addition to individual grains which show the transformation proccess, another line of evidence for the biotite-glauconite relationship is the change in facies in some shelf sediments. By change in facies is meant the gradual change from biotite-rich sands fairly near shore to mixed glauconite-mica silty sands farther off shore and a little deeper, thence progressively to glauconite muds at a depth of about 100-fathoms. A map and description of this type of occurrence in Monterey Bay have been given (2, p. 1354; 3, p. 1570). The most potent evidence that indicates intimate relationship of the minerals however, is Gruner’s X-ray work (5). Gruner, in addition to presenting experimental data, gives an interesting discussion and comparison of ionic arrangement and structure of unit cells and concludes that glauconite is a mica in structure (p. 699). |
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