The SUGAR experiment

SUwanee Suture and GA Rift basin experiment

 
 

Scientific Background

The rocks beneath the coastal plain of Georgia were at the center of the most fundamental tectonic events to shape eastern North America: continental collision around 290 million years ago to form the super continent of Pangea; continental breakup leading to the formation of the Atlantic Ocean beginning around 230 million years ago; and one of the biggest magmatic events in Earth’s history around 200 million years ago, the Central Atlantic Magmatic Province.  A record of these events and possible relationships between them is preserved by structures in the crust of southern Georgia, including a suture between two different types of continent, the largest failed rift basin along the east coast of North America and igneous rocks from the Central Atlantic Magmatic Province.  We will collect seismic refraction data, which can be used to image structures in the crust to understand these tectonic events.  Hundreds of geophones will be deployed along two ~300-km-long profiles across the suture and the basin, which will record sound waves generated by a series of explosive charges spaced ~20 km apart. Geophones are also being deployed in a box focused on the basin to record explosive charges arranged in a grid. The speed that sound waves travel through rocks varies with composition, porosity, and other rock characteristics. We will use these data to create velocity models that reveal the distribution of igneous rocks, variations in the thickness of the crust and variations in crustal composition. Besides a better understanding of fundamental tectonic processes, other benefits of this program include training and education of students, and characterization of basins and igneous rocks that might be good targets for carbon sequestration.

 

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Summary of this project on the NSF website


Supported by NSF-EarthScope

Principal Investigators

Dr. Donna J. Shillington                         Dr. Daniel Lizarralde                                   Dr. Steven Harder

Lamont-Doherty Earth Observatory       Woods Hole Oceanographic Institution       University of Texas, El Paso

Columbia University                               danl@whoi.edu                                           harder@utep.edu

djs@ldeo.columbia.edu                         508-289-2942                                              915-747-5746

845-365-8818










Experiment map showing line locations and major tectonic elements.