alkalic


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alkalic

[‚al′kal·ik]
Also known as alkali.
(petrology)
Of igneous rock, containing more than average alkali (K2 O 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).
References in periodicals archive ?
Lavas recovered from Bowie seamount range from alkalic basalt and basanite through hawaiite, mugearite and benmoreite (Engel et al.
Given that there are no known sources for alkalic basalts on Taiwan, the results of our analyses strongly support the interpretation that the adzes represent evidence for Neolithic open-sea voyaging, most likely between Taiwan and Peng-hu.
The more alkalic rock types do not satisfy this condition; thus they were deleted from further analysis.
Like the West Barneys River gabbroic samples, the dykes are tholeiitic transitional to alkalic based on Nb/Y ratio (Fig.
As alkalies readily partition into melt, alkalic basalts are thought to represent small degrees of partial melting, possibly from a source mantle previously enriched in alkalies.
These ages and that of the Porter Square camptonite fall within the range of ages of alkalic plutons and dolerite dykes in the CNE province of McHone and Butler (1984).
This intrusion has many similar characteristics to Cu-Au+Ag alkalic porphyry systems within the Quesnel Trough.
The similarity in within-plate tholeiitic to alkalic characteristics of both suites of sills, as well as mafic units in the White Rock Formation (MacDonald et al.
1998; Buchan and Ernst 2004), small lamprophyre, and alkalic rock-carbonatite plugs and dykes, and are overlain by scattered outliers of Proterozoic and Phanerozoic sedimentary cover (see reports listed in Fig.
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.
The Summer Property has become the Company's main focus of exploration, as the Quesnel Trough has produced extremely promising results in this Gold producing region, especially copper-gold alkalic porphyry deposits.