| Title | Jurassic quartz-normative tholeiite dikes from Anticosti Island, Quebec |
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| Author | Bédard, J H |
| Source | Eastern 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, https://doi.org/10.1130/spe268-p161 |
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| Year | 1992 |
| Alt Series | Geological Survey of Canada, Contribution Series 39990 |
| Publisher | Geological Society of America |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Province | Quebec |
| Area | Anticosti Island |
| Lat/Long WENS | -64.2333 -64.1667 49.8000 49.6667 |
| Subjects | general geology; regional geology; quartz; tholeiites; dykes; titanium; olivine; plagioclase; pigeonite; augite; hornblende; barium; Jurassic |
| Illustrations | location maps; graphs; tables |
| Released | 1992 01 01 |
| Abstract | Jurassic 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. |
| GEOSCAN ID | 215150 |
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