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Lithosphere interprets earth
Date:9/20/2013

ntal crust provide important information about the behavior of Earth's tectonic plates during mountain building. Studies of deep crust require knowledge of the timing of deformation during two intervals of time: (1) during the time crust was deformed at depth, and (2) during the time this deep crust was uplifted and brought near Earth's surface. This study by Gregory Dumond and colleagues uses in-situ dating of the mineral monazite to constrain the timing of movement on three large-scale shear zones that facilitated uplift of more than 20,000 square kilometers from greater than 40 km depths to greater than 20 km depths. Monazite grew during metamorphic reactions that occurred synchronous with deformation along all three shear zones at 1,849 plus or minus six million years ago. This study demonstrates how mutually interacting thrust and strike-slip shear zones can simultaneously accommodate uplift and exhumation of Earth's deep continental crust.


Rapid river incision across an inactive fault -- Implications for patterns of erosion and deformation in the central Colorado Plateau
Joel Pederson et al., Utah State University, Geology, 4505 Old Main Hill, Logan, Utah 84322, USA; and Neil Burnside, Zoe Shipton, and Tammy Rittenour; http://dx.doi.org/10.1130/L282.1.

Despite its iconic landscapes, the geologic workings of the Colorado Plateau remain an active research problem and a source of controversy. Researchers have recently proposed multiple sources of uplift and intriguing patterns of erosion, yet little or no constraints exist in the heart of the plateau to test these ideas. Joel Pederson and colleagues present results from a detailed record of absolute-dated river terraces at Crystal Geyser in southeastern Utah, USA, where the Little Grand Wash fault crosses the Green River in the broad Mancos-shale badlands of the central plateau. They find that there has been no surfac
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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