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102nd Annual Meeting of the Cordilleran Section, GSA, 81st Annual Meeting of the Pacific Section, AAPG, and the Western Regional Meeting of the Alaska Section, SPE (8–10 May 2006)

Paper No. 9
Presentation Time: 1:00 PM-4:00 PM

THE INVOLVEMENT OF STIKINE TERRANE IN DEVELOPMENT OF THE CENTRAL WHITEHORSE TROUGH, NW BRITISH COLUMBIA


SHIRMOHAMMAD, Farshad1, SMITH, Paul L.1, ANDERSON, Robert G.2 and MCNICOLL, Vicki J.3, (1)Earth and Ocean Sciences, University of British Columbia, Earth and Ocean Sciences Main, 6339 Stores Road, Vancouver, BC V6T 1Z4, Canada, (2)GSC, GSC, Vancouver, BC V6B 5J3, Canada, (3)GSC, GSC, 601 rue Booth St, Ottawa, ON K1A 0E8, Canada, fshirmoh@eos.ubc.ca

A southwestern outlier of the Whitehorse basin strata in central Tulsequah map area (NTS 104K/11), includes interbedded fossiliferous conglomerate sandstone, siltstone, and mudstone of the Lower to Middle Jurassic Takwahoni Formation (Laberge Group) which unconformably overlie Upper Triassic limestone of the Sinwa Formation. The refined age and provenance of several episodes of coarse clastic input into the basin shows that the character of the dominant clasts in the conglomerates changes up-section: above the unconformity, Early Jurassic breccia and conglomerate contain sedimentary clasts derived from the Sinwa Formation. Clast dominance changes to volcanic (in Sinemurian? rocks), plutonic (in Pliensbachian-Toarcian strata), metamorphic (in uppermost Toarcian rocks), and finally, after an interval of fine-grained sedimentation, to chert in the Middle Jurassic strata of Early Bajocian age.

Session No. 13--Booth# 26

T8. GSA: Accreted Terranes of Western North America: An Update on Current Research on the Construction of the Cordillera (Posters)
Monday, 8 May 2006: 1:00 PM-4:00 PM
Geological Society of America Abstracts with Programs. Vol. 38, No. 5, p.21
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