Abstract by Amarelda Voigt
Preliminary Report on the GPR Imaging and Sedimentology of Holocene Strand Line Deposits, Crooked Island, Bahamas
Understanding modern carbonate depositional systems provides insights into the interpretation of ancient analogs. Early carbonate strand plains act as productive hydrocarbon reservoirs because of their possibly high porosity. Ancient strand-plains are difficult to identify in the rock record due to insufficient study on modern analogs. Areas on Crooked Island (Bahamas) displayed lateral sedimentary accretion as seen by the depositional ridges visible from satellite imagery. Majors Bay, near Colonel Hill, on the island has Holocene strand-plains which was used for modern strand plain analogs. Transverse 2D GPR surveys were conducted over these ridges using 400-MHz antenna (~60 traces per meter of survey distance; ~0.3-meter survey line spacing). The radar surveys gave high-resolution images of stacked clinoforms, dipping towards the Atlantic Ocean. These characterize fine-scale patterns of lateral sedimentary accretion. Sediment samples were collected from radar traverses at a 1 meter depth. Comparing these samples collected across the adjacent modern foreshore and shoreface will illustrate stacked vertical facies patterns in radar profiles.