An extensive late Cenozoic terrestrial record of multiple glaciations preserved in the Tintina Trench of west-central Yukon: stratigraphy, paleomagnetism, palesols, and pollen
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Date
2010
Authors
Duk-Rodkin, Alejandra
Barendregt, René W.
White, James M
Journal Title
Journal ISSN
Volume Title
Publisher
NRC Research Press
Abstract
The Tintina Trench in west-central Yukon is a late Miocene graben formed along the antecedent early Tertiary
Tintina fault. Since its formation the trench has served as a sediment trap for alluvial and glacial deposits. An extensive record
of preglacial, glacial, and interglacial sediments spanning the late Pliocene to late Pleistocene has been preserved and
is exposed today in modern landslide scars. This sedimentary record comprises multiple sequences of tills, outwash, mudflows,
loess, and paleosols. The glacial sediments are the product of both local (montane) and regional (Cordilleran) ice
advances that channeled into the trench, while loess and well-developed paleosols (brunisols and luvisols) reflect nonglacial
and interglacial conditions, respectively. The Tintina Trench exposures provide the most complete record of glaciations
for the region. Paleomagnetism, paleosols, and palynology provide age constraints for the geological events. A
formal stratigraphic nomenclature is proposed for this region. The name West Tintina Trench Allogroup is assigned to the
glacial–interglacial and nonglacial strata that occurs above a major regional Miocene–Pliocene unconformity. The allogroup
spans the late Pliocene (3.6 Ma) to middle Pleistocene (0.126 Ma), based on magnetostratigraphy and pollen data.
The sequence includes an alluvial deposit at the base, overlain by an extensive sequence of tills and outwash, and capped
by loess. Paleosols and weathering horizons occur throughout the sequence. Tintina Trench; Beringia; glacial chronology;
magnetostratigraphy; early and middle Pleistocene; Yukon paleoenvironments; Yukon paleosols; Yukon pollen; North
American glaciations; West Tintina Trench Allogroup.
Description
Sherpa Romeo Green journal (pre or post print only)
Keywords
Tintina Trench , Beringia , Glacial chronology , Magnetostratigraphy , Early and middle Pleistocene , Yukon paleoenvironments , Yukon paleosols , Yukon pollen , North American glaciations , West Tintina Trench Allogroup
Citation
Duk-Rodkin, A., Barendregt, R.W. & White, J.M. (2010). An extensive late Cenozic terrestrial record of multiple glaciations preserved in the Tintina Trench of west-central Yukon: stratigraphy, paleomagnetism, paleosols, and pollen. Canadian Journal of Earth Sciences, 47