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alkalic |
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alkalic [‚al′kal·ik] Also known as alkali. (petrology) Of igneous rock, containing more than average alkali (K2O and Na2O) for that clan in which they are found. Of igneous rock, having feldspathoids or other minerals, such as acmite, so that the molecular ratio of alkali to silica is greater than 1:6. Of igneous rock, having a low alkali-lime index (51 or less). How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Occurrence Type of MINFILE/ Other References
Granitoid NORMIN *
Pluto alkalic 11613/134
Emerald Lake alkalic 1150/9
Kalzas ? During the post-shield
stage, more alkalic magmas that have lower production rates are stored
in deeper chambers (~15 km; Clague, 1987).
Mineralization as it is presently known on the Utupara Property shares
some characteristics with other porphyry copper-gold systems in general
and with alkalic copper-gold porphyry systems in particular. |
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