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GSA Bulletin: From Titan to Tibet
Date:11/27/2012

ted climate change. Weitao Wang and colleagues use a combination of field and subsurface observations to constrain basin evolution from the Middle Tertiary through Quaternary time. The results suggest that basin formation occurred about 30 million years ago and was characterized by extensional accommodation space along northern basin-bounding faults. Basin inversion initiated between six and 10 million years ago, associated with development of the modern northern Tibet boundary fault. These phenomena imply that the onset of Cenozoic sedimentation in the southern Ningxia basin does not represent a developing foredeep associated with northward growing Plateau in the latest Eocene, but rather reflects transtensional deformation, inboard of extensional basins along the east Asian margin.


U-Pb zircon geochronology of major lithologic units in the eastern Himalaya: Implications for the origin and assembly of Himalayan rocks
A. Alexander. G. Webb et al., Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA 70803, USA. Posted online 21 November 2012; http://dx.doi.org/10.1130/B30626.1.

Recent investigations of Himalayan geology suggest that simple questions -- such as "Where does Himalayan material originate?" and "How has Himalayan material been assembled?" -- may have remarkably complex answers. Authors Webb, Yin, and Dubey address these questions across the eastern Himalaya by collecting field-based and analytical data (principally, zircon crystallization ages). Their results demonstrate that the Himalayan mountains are dominantly comprised of rocks scraped off of India, but that some of these rocks contain sediment originally derived from a northern microcontinent (the Lhasa terrane) that rifted away from India in the Late Triassic. The new field and age constraints are consistent with models of Cenozoic mountain-building involving emp
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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