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TitreA lithological investigation of marine strata from the Triassic-Jurassic boundary interval, Queen Charlotte Islands, British Columbia, including a search for shocked quartz
AuteurPatzer, A; Kring, D A; Goodwin, D H; Ward, P D; Haggart, J W
Source35th Lunar and Planetary Science Conference, Program with Abstracts; 2004, 2 pages
LiensOnline - En ligne
Séries alt.Secteur des sciences de la Terre, Contribution externe 20090058
Réunion35th Lunar and Planetary Science Conference; Houston; US; mars 15-19, 2004
Mediaen ligne; numérique
Lat/Long OENS-133.2500 -133.0000 54.0000 53.7500
Sujetslithologie; sédiments marins; sédiments marins; roches sédimentaires; schistes; silts; mudstones; conglomérats; arénites; Formation de Sandilands ; Groupe de Kunga ; stratigraphie; géologie marine; Mésozoïque; Jurassique; Trias
Illustrationsphotographs; ternary diagrams
Résumé(disponible en anglais seulement)
We examined 42 thin sections of marine sedimentary rocks retrieved from Kennecott Point on Graham Island of the Queen Charlotte Islands (British Columbia, Canada). Kennecott Point harbors one of the best preserved and least disrupted stratigraphic sequences spanning the Triassic-Jurassic (T-J) boundary [1]. The samples comprise thinly-bedded, alternating limy shales, silts, and mudstones with intermittent bands of greywacke, lithic arenite, and volcaniclastic micro-conglomerate. The strata are assigned to the Sandilands Formation (uppermost Norian, Hettangian, and Sinemurian) of the Kunga Group [2]. They are believed to be silicified and, with respect to the shale, organic-rich [3]. The sequence has been variously interpreted to represent a deep basin setting that includes turbidite deposits [3] and as a shallowmarine, potentially shelf, environment [1].