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From grains of volcanic glass to continental rifting: New Geosphere articles now online
Date:2/11/2013

data bearing on the topographic evolution of the Sierra Nevada, California, USA. The systematic relationship between the azimuth and gradient of Eocene river channel deposits (paleochannels) strongly support late Cenozoic tilting and uplift of the range. Paleochannel reaches trending perpendicular to the range axis display the steepest gradients. In contrast, modern Sierran rivers do not show a systematic relationship between gradient and azimuth. Late Cenozoic initiation of significant stream incision (canyon cutting) also suggests late Cenozoic uplift, because this downcutting began in spite of apparently decreasing stream discharge and increasing sediment load. An increase in stream gradient (by tilting and uplift) best explains the onset of incision at that time. Late Cenozoic uplift and stream incision began earlier in the southern than in the northern part of the range. The southern part of the range has experienced two episodes of late Cenozoic uplift compared to a single one for the north. Stable isotope data, that have been interpreted to indicate a lack of late Cenozoic uplift, may reflect relatively recent reequilibration and/or the progressive advance of an erosional/weathering front downward into fresh rock. This study by Wakabayashi is potentially important for comparing and evaluating interpretations of the topographic evolution of mountainous regions derived from different methodologies, such as geomorphic-stratigraphic, thermochronologic, and stable isotope based paleoaltimetry. This paper is part of the "Origin and Evolution of the Sierra Nevada and Walker Lane" series.


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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

Page: 1 2 3 4 5 6 7 8 9 10

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