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Normative mineralogy
For this reason it is not advised to utilise a CIPW norm on kimberlites, lamproites, lamprophyres and some silica-undersaturated igneous rocks. In the case of ...
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List of rock types - Wikipedia, the free encyclopedia
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If we calculate a CIPW Norm (we'll see how to do this in lab) the normative minerals that occur in silica undersaturated rocks are nepheline and/or leucite.
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NaSi predominating in silica-undersaturated rock series and NaAl = n Si in basic and inter- mediate rocks from silica-oversaturated series. Secondly, this feature ...
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Silica-undersaturated trachytic rocks of central Scotland. B. G. J. Upton. 1. , D. Stephenson. 2. , & R. M. Ellam. 3. 1 School of Geosciences, West Mains Road, ...
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Dec 14, 2009 ... Undersaturated rocks are those with silica-deficient minerals that are incompatible with quartz. These minerals include corundum, olivine, ...
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Sep 29, 2000 ... Alkalic - rock suites in which the total of alkali oxides (Na20+K20) exceeds that of Ca0 at a silica content less than 51% (undersaturated), ...
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Sr-isotopic data indicate more radiogenic ratios for the SiO2-oversaturated rocks (0.7062-0.7067 against 0.7048-0.7054 for the SiO2-undersaturated syenites), ...
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Fe2+-dominant rhönite in undersaturated alkaline basaltic rocks, Kaiserstuhl volcanic complex, Upper Rhine Graben, SW Germany. Rodney Grapes1,* and ...
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It omits many calculations for unusual rocks. For example, the procedures to calculate normative leucite in strongly silica-undersaturated rocks, aegirine in ...
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