petrography, geochemistry and petrogenesis of alkaline dyke rocks from the coldwell alkaline complex, northwestern ontario
abstract
dyke rocks occurring in the coldwell alkaline instrusive complex, n. w. ontario, were studied by various petrographic and geochemical means. the resulting observations indicate that 5 types of mafic alkaline lamprophyres, distinguished on the basis of chemistry and mineralogy according to the scheme of rock (1977), and 1 type of felsic tinguaite occur in the complex (in approximate order of abundance):
a) ocellar camptonites
b) analcite tinguaites
c) quartz-bearing camptonites
e) amphibole camptonites
f) monchiquites
lamprophyres are characterized mineralogically by phenocrysts of clinopyroxene and brown amphibole, and remnant phenocrysts of olivine...(see document for full abstract)
collections
- retrospective theses [1604]
related items
showing items related by title, author, creator and subject.
-
aspects of the mineralogy of the murun alkaline complex, yakutia, russia
(2001)the murun complex contains a number of unusual and mineralogically unique rocks. many of them are problematic in terms of their genesis and petrographic interpretation. these enigmatic rocks include charoite assemblages, ... -
the mineralogy of nyf pegmatites from the coldwell alkaline complex, northwestern ontario
(2009)the coldwell complex, northwestern ontario, is a multiphase alkaline intrusion that is host to rare earth element, actinide and other high field strength element mineralization. preliminary studies have shown that these ... -
petrology of syenites from centre iii of the coldwell alkaline complex, northwest ontario
(1988)the coldwell alkaline complex, situated on the north shore of lake superior, is of neohelikian age. it is intruded into archean supracrustal rocks of the superior province, near marathon, ontario. the complex has a diameter ...
