| Titre | Jurassic quartz-normative tholeiite dikes from Anticosti Island, Quebec |
| |
| Auteur | Bédard, J H |
| Source | Eastern North American Mesozoic magmatism; par Puffer, J H (éd.); Ragland, P C (éd.); Geological Society of America, Special Paper vol. 268, 1992 p. 161-167, https://doi.org/10.1130/spe268-p161 |
| Image |  |
| Année | 1992 |
| Séries alt. | Commission géologique du Canada, Contributions aux publications extérieures 39990 |
| Éditeur | Geological Society of America |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1130/spe268-p161 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Province | Québec |
| Région | Île d'Anticosti |
| Lat/Long OENS | -64.2333 -64.1667 49.8000 49.6667 |
| Sujets | quartz; tholéiites; filons rocheux; titane; olivine; plagioclase; pigeonite; augite; hornblende; baryum; géologie générale; géologie régional; Jurassique |
| Illustrations | cartes de localisation; graphiques; tableaux |
| Diffusé | 1992 01 01 |
| Résumé | (disponible en anglais seulement)
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 |
|
|