Geology and tectonic history of the Whitehorse trough west of Atlin, British Columbia
Thesis/Dissertation
·
OSTI ID:5365648
The Mesozoic Whitehorse trough extends southeast from the south-central Yukon into northern British Columbia. In the study area, the trough strata are separated from the oceanic Upper Paleozoic Atlin Terrane to the Northeast by the steeply northeast-dipping Nahlin fault, and from the Upper Paleozoic and older amphibolite to greenschist facies metamorphic rocks and plutons of the Coast plutonic complex to the southwest by the subvertical Llewellyn fault system. The trough is a synclinorium with basal Upper Triassic strata exposed only along the margins; they are mainly flows and associated volcaniclastic rocks capped by fossiliferous limestone on the south-west and pyroclastic rocks on the northeast. Lower and Middle Jurassic clastic strata of the Laberge Group dominate the center of the trough; they include the shallow marine Takwahoni Formation on the southwest and the widespread submarine fan deposits of the Inklin Formation on the northeast. The generally homoclinal, steeply northeast-dipping Takwahoni and unconformably underlying strata of the southwest margin are separated from folded Inklin strata and Upper Triassic rocks to the northeast by the steeply northeast-dipping King Salmon fault. The following tectonic history is suggested: widespread and varied late Triassic volcanism initiated deposition in the trough, part of which was floored by oceanic crust. The trough was mainly filled by early and middle Jurassic clastic sedimentation; the near-shore Takwahoni Formation accumulated along the southwest margin while the submarine fans of the Inklin Formation prograded northeastward into the main part of the trough.
- Research Organization:
- Yale Univ., New Haven, CT (USA)
- OSTI ID:
- 5365648
- Country of Publication:
- United States
- Language:
- English
Similar Records
Geologic settings for hydrocarbons in the Gafsa trough of central Tunisia
Geology of a portion of southern Madison range, southwestern Montana
Stratigraphy and structure along the Pensacola Arch/Conecuh Embayment margin in northwest Florida
Conference
·
Thu Feb 28 23:00:00 EST 1991
· AAPG Bulletin (American Association of Petroleum Geologists); (United States)
·
OSTI ID:7272004
Geology of a portion of southern Madison range, southwestern Montana
Conference
·
Sat Aug 01 00:00:00 EDT 1987
· AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)
·
OSTI ID:5863925
Stratigraphy and structure along the Pensacola Arch/Conecuh Embayment margin in northwest Florida
Conference
·
Sun Feb 28 23:00:00 EST 1993
· Geological Society of America, Abstracts with Programs; (United States)
·
OSTI ID:6112642