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Impacts of sediment supply and local tectonics on clinoform distribution: the seismic stratigraphy of the mid Pleistocene-Holocene Indus Shelf |
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| Authors: | David R Limmer Timothy J Henstock Liviu Giosan Camilo Ponton Ali R Tabrez David I M Macdonald Peter D Clift |
| Institution: | 1. School of Geosciences, University of Aberdeen, Meston Building, Aberdeen, AB24 3UE, UK 2. School of Ocean and Earth Science, National Oceanography Centre, University of Southampton, Southampton, SO14 3ZH, UK 3. Department of Geology and Geophysics, Woods Hole Oceanographic Institution, 360 Woods Hole Road, Woods Hole, MA, 02543, USA 4. National Institute of Oceanography ST-47 Block 1, Clifton, Karachi, 75600, Pakistan 5. Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA, 70803, USA |
| Abstract: | We present results from the first high-resolution seismic reflection survey of the inner Western Indus Shelf, and Indus Delta, Arabian Sea. The results show major regional differences in sedimentation across the shelf from east to west, as well as north to south, both since the Last Glacial Maximum (~20?ka) and over longer time scales. We identify 10 major regional reflectors, interpreted as representing sea level lowstands. Strong compressive folding is observed underlying a reflector we have called Horizon 6 in the north-western shelf, probably compression associated with the transpressional deformation of the Murray Ridge plate boundary. Downslope profiles show a series of well developed clinoforms, principally at the shelf edge, indicating significant preservation of large packages of sediment during lowstands. These clinoforms have developed close to zones of deformation, suggesting that subsidence is a factor in controlling sedimentation and consequently erosion of the Indus Shelf. These clinoforms fan out from dome features (tectonic anticlines) mostly located close to the modern shoreline. |
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