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GSA Bulletin starts 2013 with 13 new papers published online ahead of print
Date:2/6/2013

hoe/Carson City region; however, these results confirm that the region has experienced major earthquakes throughout the Holocene.


Evaporite tectonics and the late Paleozoic stratigraphic development of the Cumberland basin, Appalachians of Atlantic Canada
John W.F. Waldron et al., Dept. of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada. Posted online 11 Jan. 2013; http://dx.doi.org/10.1130/B30718.1.

The Cumberland basin is part of the large and deep Maritimes Sedimentary Basin of Atlantic Canada, interpreted to have developed at tropical latitudes, from about 350 to 300 million years ago, in the Mississippian and Pennsylvanian periods. The basin fill includes thick evaporites -- anhydrite, gypsum, rock salt. Overlying clastic sedimentary rocks include fossil forests with upright trees, preserved at the Joggins Fossil Cliffs UNESCO World Heritage Site. Analysis of seismic profiles demonstrates that the subsidence that allowed these strata to accumulate was produced by salt expulsion. In the western part of the basin, evaporites remained largely undisturbed until the Pennsylvanian Period, when their rapid expulsion allowed accumulation of the thick Joggins succession with its upright tree fossils. In the eastern part of the basin, evaporite withdrawal began earlier, producing "minibasins" filled by Mississippian strata. Many of the structures are similar to those on salt-bearing continental margins such as the eastern margin of North America. However, the tectonic environment encouraged vertical, rather than horizontal movement of salt. These features may be characteristic of salt tectonics in basins bounded by faults with horizontal movement. Salt expulsion has strongly influenced the distribution of hydrocarbons and other resources in the basin.


Understanding a critical basinal link in Cretaceous Cordilleran paleo
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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