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Lithosphere highlights: Slab dynamics, the Troodos ophiolite, and the Jurassic Bonanza arc
Date:11/15/2012

ctonic processes that built the mountains have either significantly slowed or stopped. In this study, D. Mirakiam and colleagues analyze the Taiwan mountain belt in order to understand the initial formation of topographic curvature in a geologically young and tectonically active region. They present observations of the structure and geomorphology along a topographic break that runs counter to the regional topographic grain of the mountain belt. Their results indicate that the topographic grain of active mountain belts responds to variations in the thickness, composition, and geometry of crust in the subducting plate over relatively short time scales (hundreds of thousands of years) and that curvature in mountain belts is expressed by topographic relief more quickly than by regional-scale geologic features.


Metamorphic constraints on the character and displacement of the South Tibetan fault system, central Bhutanese Himalaya
F. Cooper et al., School of Earth and Space Exploration, Arizona State University, Tempe, Arizona 85287, USA. Posted online 26 Oct. 2012; http://dx.doi.org/10.1130/L221.1.

The Himalayan mountain range is Earth's most dramatic example of continent to continent collision. As expected, the majority of faults within the range are contractional, but it also contains a family of extensional faults: the South Tibetan fault system (STFS). Extensional deformation is inconsistent with typical models of contractional mountain building, and the role that the STFS has played in the development of the Himalayas is hotly debated. One of the fundamental questions is how much normal-sense displacement has the system accommodated? In central Bhutan, heavy vegetation cover and rugged relief make direct structural mapping of the main STFS fault zone difficult. Instead, F. Cooper and colleagues looked for discontinuities in peak metamorphic temperature and struct
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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