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GSA Bulletin celebrates GSA's 125th Anniversary with new geologic time scale
Date:12/27/2012

cted the mid-continent of North America during the past 10,000 years, and similar climate changes will likely happen in the future. A small watershed in northern Minnesota, USA, showed only subtle dynamics during rapid climate changes that caused vegetation in the catchment to switch between pine forest, open grassland, and deciduous forest. The most substantial changes in ecosystem properties immediately followed deglaciation of the landscape, formation of the lake, and initial development of pine forests. The lack of response to subsequent dry and wet conditions afterward indicates relative resistance to abrupt climate change at later stages of ecosystem development.


Constraining the timing of fault reactivation: Eocene coseismic slip along a Late Ordovician ductile shear zone (northern Victoria Land, Antarctica)
G. Di Vincenzo et al., Istituto di Geoscienze e Georisorse, CNR, via Moruzzi 1, I Pisa, Italy. Posted online 21 Dec. 2012; http://dx.doi.org/10.1130/B30670.1.

The reactivation of faults or shear zones is a fundamental characteristic of deformation in the continental crust. Faults and shear zones give rise to long-lived zones of weakness which may repeatedly accommodate successive episodes of deformation. A better understanding of reactivation is crucial in order to determine whether a fault is extinct or just temporarily inactive, and this may have implications for seismic hazard assessment. This study by G. Di Vincenzo and colleagues exploits the potential of the 40Ar-39Ar dating method in conjunction with field analysis and electron microscopy down to the nanoscale to assess fault reactivation in fault rocks from the western shoulder of one of the world's largest rifts, the West Antarctic Rift System. The studied fault rocks experienced brittle deformation, with the development of friction-induced melts (pseudotachylyte), overprinting a ductile shear zone
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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