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TitleJurassic quartz-normative tholeiite dikes from Anticosti Island, Quebec
AuthorBédard, J H
SourceEastern North American Mesozoic magmatism; by Puffer, J H (ed.); Ragland, P C (ed.); Geological Society of America, Special Paper vol. 268, 1992 p. 161-167,
Alt SeriesGeological Survey of Canada, Contribution Series 39990
PublisherGeological Society of America
Mediapaper; on-line; digital
File formatpdf
AreaAnticosti Island
Lat/Long WENS -64.2333 -64.1667 49.8000 49.6667
Subjectsgeneral geology; regional geology; quartz; tholeiites; dykes; titanium; olivine; plagioclase; pigeonite; augite; hornblende; barium; Jurassic
Illustrationslocation maps; graphs; tables
Released1992 01 01
AbstractJurassic quartz-normative tholeiite dikes from Anticosti Island in the Gulf of St. Lawrence are generally similar to the low-TiO2, quartz-normative tholeiites (Weigand and Ragland, 1970) of the eastern North American province, but have TiO2 contents intermediate between low- and high-TiO2 types. The Anticosti dikes contain olivine microphenocryst pseudomorphs, sparse plagioclase phenocrysts, groundmass plagioclase laths, ophitic pigeonite and augite, ± interstitial Fe-Ti oxides, ± hornblende, ± biotite, and variable proportions (0% - 20%) of interstitial devitrified glass. High K, light rare earth element, and Ba contents suggest some crustal contamination, but the low Zr/Y ratio of plausible model contaminants into normal mid-ocean ridge basalt implies that the assimilate was poor in Zr.

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