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

725.1.

Global change is accelerating the rate of sea-level rise and will likely affect the rate of intense hurricanes impacting coastlines in the future. This could dramatically impact sandy coastlines worldwide; however, there is a lack of field-based studies utilizing the geologic record of past periods of rapid sea-level rise and hurricanes to shed light on these potential future coastal changes. In this paper, Davin Wallace and John B. Anderson describe the evolution of a coupled Texas barrier island system (Galveston/Follets Islands, San Luis Pass Tidal Delta, and offshore) over the last few millennia by measuring erosion due to sea-level rise and hurricanes. Their data show that during periods of high sediment supply and rapid sea-level rise, the time-averaged volumetric erosion flux offshore due to hurricanes is higher. During periods of reduced sediment supply and slower sea-level rise, the time-averaged volumetric erosion flux offshore due to hurricanes is lower. They couple these data with the volumetric sand flux to a nearby tidal delta, which records the barrier's erosion through time. Wallace and Anderson then show that historic erosion along the upper Texas coast is unprecedented relative to the geologic record and associate these changes with accelerated sea-level rise punctuated by hurricane events.


Late Cretaceous subduction of the continental basement of the Maya block (Rabinal Granite, central Guatemala): Tectonic implications for the geodynamic evolution of Central America
Luigi A. Solari et al., Centro de Geociencias, Universidad Nacional Autnoma de Mxico, Campus Juriquilla, 76001 Quertaro, Quertaro, Mexico. Posted online 29 Jan. 2013; http://dx.doi.org/10.1130/B30743.1.

The southernmost portion of the continental North America Plate ends in central Guatemala, where it is known as the Maya block. There, Luigi A Solari and coauthors have studi
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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