Mid-Cretaceous transtension in the Canadian Cordillera: evidence from the Rocky Ridge volcanics of the Skeena Group

Article Abstract:

The mid-Cretaceous Rocky Ridge Formation volcanic and intercalated clastic deposits of the Skeena Group are analyzed. The tectonic setting, timing and paleogeography of the volcanism are investigated. Faces interpretations of measured profiles through the Skeena Group, provenance, paleocurrent indicators and geochemistry from lava flows are used for reconstruction. The tectonic reconstruction of the Rocky Ridge volcanism is found to be that of intraarc transtension.

Canada, Geology, Stratigraphic, Stratigraphy, Cretaceous period

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Tectonically versus climatically driven Cenozoic exhumation of the Eurasian plate margin, Svalbard: fission track analyses

Article Abstract:

The tectonic and climatic factors that caused the exhumation of Svalbard during the last 70 million years were examined using regional geologic data as well as apatite and zircon fission track thermochronology. Evidence of cooling was discovered from the Paleogene Forlandsundet and Kongsfjorden basins and the Late Cretaceous-Tertiary Svalbard orogen range. The Pliocene-Holocene cooling is consistent with the ice cover at the Norwegian-Greenland Sea.

Svalbard

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Deformational history of the central Brooks Range, Alaska: results from fission-track and 40Ar/39Ar analyses

Article Abstract:

Fission-track and 40Ar/39Ar analyses of the central Brooks Range show that negligible deformation occurred from 185 to 135 Ma in this orogenic belt in Alaska. This is due to slow cooling rates in the fold and thrust belt. Contractional deformation from 135 to 95 Ma induced rapid cooling. Rapid cooling in the Doonerak Window region occurred at 25 Ma and in the entire northern Alaska at 60 Ma.

Analysis, Usage, Alaska, Cooling, Fission track dating

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