A study of the potassium feldspare in some igneous and metamorphic rocks from the Moak-Thompson map area, Manitoba
| dc.contributor.author | Trembath, Lowell Thomas | en_US |
| dc.date.accessioned | 2012-05-09T20:17:46Z | |
| dc.date.available | 2012-05-09T20:17:46Z | |
| dc.date.issued | 1962 | en_US |
| dc.degree.discipline | Geology | en_US |
| dc.degree.level | Master of Science (M.Sc.) | en_US |
| dc.description.abstract | Sodium and potassium contents of 35 igneous and metamorphic rock specimens from the Moak-Thompson area were determined by flame photometer. Potassium feldspars were separated from the rocks and obliquities (triclinicities) of the mineral estimated from X-ray powder photographs. For a number of specimens an increase in obliquity may be correlated with an increase in the ratio K felspar:total alkali feldspar with a monoclinic K feldspar occurring in a rock with ~ 23 mole % K feldspar of the total alkali feldspar and a maximum microcline in a rock with ~ 67 mole % K feldspar of the total alkali feldspar. It is suggested that there is a microcline series extending over the composition range ~ 23 - 67 mole % K feldspar of the alkali feldspar diagram, and a phase diagram is proposed. A modification of the phase diagram for very high water pressures is proposed to account for the occurrence of microclines with a given obliquity in igneous rocks of differing alkali compositions. An orthoclase-low albite phase diagram is proposed to account for the orthoclase-cryptoperthite series... The study suggests a possible way of distinguishing between igneous and metamorphic rocks. | en_US |
| dc.format.extent | ii, 53 leaves : | en_US |
| dc.identifier | ocm72808106 | en_US |
| dc.identifier.uri | http://hdl.handle.net/1993/5428 | |
| dc.language.iso | eng | en_US |
| dc.rights | open access | en_US |
| dc.title | A study of the potassium feldspare in some igneous and metamorphic rocks from the Moak-Thompson map area, Manitoba | en_US |
| dc.type | master thesis | en_US |
| local.subject.manitoba | yes | en_US |
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