zoic age, suggesting the existence of an older arc predating the Sa'al arc by about 80 million years. Detrital zircons of the SMC pelites exhibit textural and U-Pb age patterns supporting their derivation from the volcanic rocks as arc detritus. The ~820 million year age of a granitic pluton intruding the complex suggests that by Cryogenian times the 1 Ga rocks were already part of the ANS. The 1.0-1.1 Ga SMC rocks provide a possible connection between latest Mesoproterozoic ocean closure during the assembly of Rodinia and the later buildup of Gondwana. There is growing indication, including the findings of this study, that 1.0.1 Ga crust composed a more significant component in northernmost Gondwana than hitherto recognized.
High tide of the warm Pliocene: Implications of global sea level for Antarctic deglaciation
Kenneth G. Miller et al., Dept. of Earth and Planetary Sciences, Rutgers University, Piscataway, New Jersey 08854, USA. Posted online 19 Mar. 2012; doi: 10.1130/G32869.1.
Kenneth G. Miller of Rutgers University and colleagues demonstrate that the available data constrain peak sea level at 22 meters (plus or minus 10 m -- a 95% confidence interval) during a warm interval about 3 million years ago, when atmospheric carbon dioxide levels were similar to today's and temperatures were 2-3 degrees Celsius warmer. This indicates that the equilibrium condition for sea level under today's atmospheric CO2 levels requires the nearly total deglaciation of both Greenland and the West Antarctic Ice Sheet, with a possible contribution of ~10 m from the low-lying, marine-based coastal margins of the East Antarctic Ice Sheet.
Estimating the volume of tephra deposits: A new simple strategy
C. Bonadonna and University of Geneva, 13 rue des Maraichers, 1205 Geneva, Switzerland; and A. Costa. Posted online 19 Mar. 2012; doi: 10.1130/G32769.1.
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