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Lithosphere interprets earth
Date:9/20/2013

e rupture of the fault in the past 100,000 years, and the Little Grand Wash fault contrasts with other faults in the region that are presently active due to movement of subsurface salt deposits. Pederson and colleagues hypothesize that there may be a Pliocene component of fault slip in the region linked to broad-scale erosion, unloading, and domal rebound. The Green River at Crystal Geyser, on the other hand, has incised at a relatively rapid pace of 45 cm/thousand years (450 m/million years) over the last 100,000 years, and there is an apparent rapid decrease in incision rates just upstream through Desolation Canyon, suggesting the river has recently experienced an upstream-migrating wave of incision.


Paleogeography of the Insular and Intermontane terranes reconsidered: Evidence from the southern Coast Mountains Batholith, British Columbia
Margaret E. Rusmore et al., Occidental College, Geology, Los Angeles, California 90041, USA; and Scott W. Bogue, and Glenn J. Woodsworth; http://dx.doi.org/10.1130/L288.1.

New geologic and paleomagnetic data from Knight Inlet in the southwestern Coast Mountains Batholith, British Columbia, support significant revision to the paleogeography of the Insular and Intermontane terranes. Recompilation of radiometric ages confirms that after 100 million years ago, a magmatic arc migrated northeastward across the Coast Mountains Batholith at ~2 km per million years. Magmatic age patterns suggest that plutons older than 100 million years intruded the Intermontane terrane, not the expected Insular terrane. The distribution of brittle faults along Knight Inlet defines a structurally intact central domain, ~45 km wide, flanked to the SW and NE by faulted domains, with no evidence of the widespread Tertiary extension affecting the batholith farther north. Aluminum-in-hornblende geobarometry yields emplacement depths of ~2.5 to 4 kbar and does not r
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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