Impacts of sediment supply and local tectonics on clinoform distribution

the seismic stratigraphy of the mid Pleistocene-Holocene Indus Shelf

David R. Limmer, Timothy J. Henstock, Liviu Giosan, Camilo Ponton, Ali R. Tabrez, David I. M. Macdonald, Peter D. Clift

Research output: Contribution to journalArticle

4 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)251-267
Number of pages17
JournalMarine Geophysical Research
Volume33
Issue number3
Early online date1 Aug 2012
DOIs
Publication statusPublished - Sep 2012

Fingerprint

seismic stratigraphy
Stratigraphy
stratigraphy
lowstand
Tectonics
shelves
Sedimentation
tectonics
Sediments
sediments
Holocene
Pleistocene
sedimentation
tectonic feature
Subsidence
Sea level
Domes
shelf break
anticline
plate boundary

Keywords

  • Indus Delta
  • quaternary
  • clinoforms
  • seismic stratigraphy

Cite this

Impacts of sediment supply and local tectonics on clinoform distribution : the seismic stratigraphy of the mid Pleistocene-Holocene Indus Shelf. / Limmer, David R.; Henstock, Timothy J. ; Giosan, Liviu; Ponton, Camilo; Tabrez, Ali R.; Macdonald, David I. M.; Clift, Peter D.

In: Marine Geophysical Research, Vol. 33, No. 3, 09.2012, p. 251-267.

Research output: Contribution to journalArticle

Limmer, David R. ; Henstock, Timothy J. ; Giosan, Liviu ; Ponton, Camilo ; Tabrez, Ali R. ; Macdonald, David I. M. ; Clift, Peter D. / Impacts of sediment supply and local tectonics on clinoform distribution : the seismic stratigraphy of the mid Pleistocene-Holocene Indus Shelf. In: Marine Geophysical Research. 2012 ; Vol. 33, No. 3. pp. 251-267.
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AU - Macdonald, David I. M.

AU - Clift, Peter D.

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AB - 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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