More information:

Kirkpatrick, L.H., Green, A.N. and Pether, J. 2019. The seismic stratigraphy of the inner shelf of southern Namibia: The development of an unusual nearshore shelf stratigraphy. Marine Geology, 408: 18-35


Description:

The seismic stratigraphy of the inner shelf of southern Namibia: The development of an unusual nearshore shelf stratigraphy.

Summary / Notes:

This paper investigates the complex interplay between allocyclic, autocyclic and antecedent controls on the development of the proximal portions of a wave-dominated, gravel-rich submerged delta. The inner shelf of the Orange River delta of southern Namibia is investigated using seismic stratigraphic methods and vibracore data, in conjunction with onshore electromagnetic data. The aim is to define and interpret the major seismic stratigraphic units and to examine the controls on the stratigraphic evolution of the area. The stratigraphy comprises a crystalline bedrock and sedimentary rock basement, the contact of which exhibits a break-in-slope in the palaeo-bathymetry surface. The basement is truncated by a subaerial unconformity which includes two palaeo channels incised into a bedrock palaeo-promontory offshore of the modern Orange River Mouth. The incision of these channels is attributed to episodic periods of river rejuvenation linked to tectono-eustatic events of the late Cretaceous and end Neogene, during which sea level dropped below the shelf break. The ensuing smaller glacio-eustatic sea-level oscillations of the Quaternary led to the formation of bypass valleys which did not incise the existing channels and allowed remnants of original (old), course channel fill to remain in the lower sequences of the valley fill. North and offshore of the bedrock palaeo-promontory, the basement is overlain by a widespread, thick (up to 3 m) gravel lag associated with repeated ravinement events that represent multiple cycles of subaerial and wave ravinement erosion including those of the last post-glacial transgression. This gravel lag represents the proximal portion of the world's largest diamond placer deposit. Gravel spit, barrier and linear beach facies occur between −70 and −55 msl and are interpreted to have developed under high rates of coarse sediment supply during a stillstand preceding MWP-1B. A constructional phase of delta progradation followed, interposed with backstepping which we consider representative of the final shoreline trajectory from MWP-1B through 1D. The overlying thick (up to at least ~70 m), fine-sandy to muddy clinoform unit is the proximal portion of the modern delta of the Orange River which has prograded during the Holocene and episodically accumulates fine sediments during flood events in modern times. Gravel deposits are winnowed by cyclical erosion processes in combination with the oceanographic regime to strongly partition the grain sizes of the shelf stratigraphy. Gravel deposits (e.g. lags and barrier beaches etc.) are preserved by inheritance of the sediment stock and by later sheltering from wave energy due to antecedent topography. Where gravel beaches and deltas formed, their preservation in the stratigraphy is enhanced due to existing low-gradient palaeo-slope and punctuated rises in sea level which overstepped the shelf geomorphology. Keywords: Inner shelf stratigraphy, Antecedent controls, Gravel-dominated, Orange River, Wave-dominated delta, Meltwater pulses.

Year: 2019

Type: Journal Article

URL: https://doi.org/10.1016/j.margeo.2018.11.016


Top 50 related results:

You may also be interested in the following items which are on a similar or related topic, listed in order of similarity.

Results per page:

Results: 1 to 50 of 50

To FILTER: Use the pale green row to filter the results on this page. Type in text or select from the year list.

Rows matching filter(s): All
What is this row? 
Data titleYearOriginFile typeDownloadkml/kmz
Robertson, A., Jarvis, A., Mendelsohn, J. and Swart, R. 2012. Chapter 4: The Living Coast in: Namibia's Coast: Ocean Riches and Desert Treasures. Directorate of Environmental Affairs, Ministry of Environment and Tourism, Namibia, pp. 66-109
  » More info & related results
2012Data compiled for: Namibia's Coast ocean riches and desert treasuresBook, Book Section, Booklet6.09 mb pdf
Preview
IOC and UNESCO. 2007. Ocean Data and Information Network for Africa (ODINAFRICA). Nineteenth Session of the IOC Committee on International Oceanographic Data and Information Exchange (IODE-XIX), Trieste, Italy, 12-16 March 2007
  » More info & related results
2007 Report2 mb pdf
Preview
Carter, R. 2012. Environmental Impact Assessment Report - Dredging of marine phosphates from ML 170. Appendix 1b: Marine Benthic Specialist Study for a Proposed Development of Phosphate Deposits in the Sandpiper Phosphate Licence Area off the Coast of Central Namibia - Water Column
  » More info & related results
2012 Report2.22 mb pdf
Preview
Midgley, J. 2014. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Volume 1: Main Report. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report2.96 mb pdf
Preview
Midgley, J. 2014. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Volume 2: Appendices. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report1.15 mb pdf
Preview
van Ballegooyen, R.C. 2014. Review: The utility of hydrodynamic and biochemical numerical modelling to better inform potential water column and benthic impacts of proposed dredging of marine phosphates in Mining Licence Area ML 170, Namibia. CSIR Report. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Section C: Specialist Studies. Volume 1, Main Report. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report2.28 mb pdf
Preview
Kirby, B. 2014. Specialist Study, Section C2.3 - Thiobacteria. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Section C: Specialist Studies. Volume 1, Main Report. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report333 kb pdf
Preview
McClurg, T.P. 2014. Specialist Study, Section C2.6 - A survey of Epifauna in the Sandpiper- 1 (SP-1) target phosphate dredging area on the central Namibian continental shelf. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Section C: Specialist Studies. Volume 1, Main Report. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report3.02 mb pdf
Preview
Japp, D. and Smith, M. 2014. Specialist Study, Section C3.1 - Varification survey report: Fish, mammals and seabirds. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Section C: Specialist Studies. Volume 1, Main Report. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report5.97 mb pdf
Preview
Gaylard, J. 2013. Specialist Study, Section C3.2 - Fisheries biomass and stock assessment. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Section C: Specialist Studies. Volume 1, Main Report. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2013 Report2.62 mb pdf
Preview
Kochrane, K.L. 2014. Specialist Study, Section C3.3 - Opinion on the ecosystem impacts related to dredging of phosphates offshore Namibia. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Section C: Specialist Studies. Volume 1, Main Report. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report342 kb pdf
Preview
Compton, J.S. 2014. Specialist Study, Section C1.1 - Preliminary model for the origin and age of the Sandpiper Deposit. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Section C: Specialist Studies. Volume 1, Main Report. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report20.89 mb pdf
Preview
Carter, R. and Munnik, K. 2014. Specialist Study, Section C2.1 - Water Column and Sediments. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Section C: Specialist Studies. Volume 1, Main Report. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report12.68 mb pdf
Preview
Smith, M. and Japp, D. 2014. Specialist Study, Section C3.5 - Review of the spawning activity, Ichthyoplankton drift routes and the recruitment of Namibian marine fauna. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Section C: Specialist Studies. Volume 1, Main Report. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report5.2 mb pdf
Preview
Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Volume 1, Main Report. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report3.15 mb pdf
Preview
Munnik, K. and Carter, R. 2014. 1.1 - Project execution plan: Verification Survey MV DP Star. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Volume 2, Section D - Appendices: Appendix 1 - 1.0 Water column and sedimentary environment. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2013 Report1.15 mb pdf
Preview
Russell, A. 2014. 1.3 - Project Execution Plan: Thiobacteria Survey MV Snowgoose. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Volume 2, Section D - Appendices: Appendix 1 - 1.0 Water column and sedimentary environment. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report888 kb pdf
Preview
Bothma, B. 2014. 1.4 - Cruise Report: Thiobacteria Survey MV Snowgoose. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Volume 2, Section D - Appendices: Appendix 1 - 1.0 Water column and sedimentary environment. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report1.24 mb pdf
Preview
Munnik, K. and Carter, R. 2014. 1.5 - Project Execution Plan: Core Sampling MV Snowgoose. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Volume 2, Section D - Appendices: Appendix 1 - 1.0 Water column and sedimentary environment. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report1.09 mb pdf
Preview
Munnik, K. and Carter, R. 2014. 1.6 - Gravity Core: Analysis Requirements. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Volume 2, Section D - Appendices: Appendix 1 - 1.0 Water column and sedimentary environment. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report206 kb pdf
Preview
Bothma, B. 2014. 1.7 - Cruise Report: Core Sampling MV Snowgoose. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Volume 2, Section D - Appendices: Appendix 1 - 1.0 Water column and sedimentary environment. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report1 mb pdf
Preview
Metocean Services International. 2014. 1.8 - Instrument Mooring Report: Day 0 to 45. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Volume 2, Section D - Appendices: Appendix 1 - 1.0 Water column and sedimentary environment. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report2.98 mb pdf
Preview
Smith, M. 2014. 2.1 - PEP Biodiversity Survey FV Zeearend. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Volume 2, Section D - Appendices: Appendix 2 - Fisheries and biodiversity. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report4.2 mb pdf
Preview
Capricorn Fisheries Monitoring. 2014. 2.2 - Cruise Report Biodiversity Survey FV Zeearend. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Volume 2, Section D - Appendices: Appendix 2 - Fisheries and biodiversity. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report1.34 mb pdf
Preview
Lwandle Technologies. 2014. 2.3 - CTD Deployment Report FV Zeearend. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Volume 2, Section D - Appendices: Appendix 2 - Fisheries and biodiversity. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report2.43 mb pdf
Preview
2.4 - Sailing Orders Biodiversity Survey FV Zeearend. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Volume 2, Section D - Appendices: Appendix 2 - Fisheries and biodiversity. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report170 kb pdf
Preview
Capricorn Fisheries Monitoring. 2014. 2.5 - Biodiversity Induction Module FV Zeearend. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Volume 2, Section D - Appendices: Appendix 2 - Fisheries and biodiversity. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report8.03 mb pdf
Preview
Marine Data Consultants. 2014. 3.1 - Geophysical Processing Procedures. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Volume 2, Section D - Appendices: Appendix 3 - Geophysics. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report508 kb pdf
Preview
Midgley, J. 2014. 3.2 - Geophysical Habitat Mapping. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Volume 2, Section D - Appendices: Appendix 3 - Geophysics. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report2.6 mb pdf
Preview
Jeremy Midgley and Associates. 2014. 4 - Process documentation. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Volume 2, Section D - Appendices: Appendix 4 - Process documentation. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report3.58 mb pdf
Preview
5 - Curricula Vitae and Terms of Reference. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Volume 2, Section D - Appendices: Appendix 5 - Curricula Vitae and Terms of Reference. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report2.89 mb pdf
Preview
Volume 2, Appendices: Contents. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Volume 2, Section D - Appendices. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report1.64 mb pdf
Preview
Carter, R. 2014. B1.1 - Verified assessment of impacts: Sediments and water column. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Section B: Impact Assessment Varification. Volume 1, Main Report, pages 6-19. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report862 kb pdf
Preview
Japp, D. 2014. B1.2 - Verified assessment of impacts: Fisheries, Mammals and Seabirds. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Section B: Impact Assessment Varification. Volume 1, Main Report, pages 20-55. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report3.87 mb pdf
Preview
Steffani, N. 2014. B1.3 - Verified assessment of impacts: Macrofauna. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Section B: Impact Assessment Varification. Volume 1, Main Report, pages 56-72. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report914 kb pdf
Preview
Gibbons, M. 2014. B1.4 - Verified assessment of impacts: Jellyfish. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Section B: Impact Assessment Varification. Volume 1, Main Report, pages 72-82. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report839 kb pdf
Preview
B2.0 - Cummulative effects assessment. Sandpiper Project: Verification Programme Report: Mining Licence Area no. 170. Section B: Impact Assessment Varification. Volume 1, Main Report, pages 83-87. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report802 kb pdf
Preview
Payne, I.L. 2014. Part 1: Peer Review Report on Specialist Studies of the Verification Programme. Independent Peer Reviews - Verification Studies, Sandpiper Project, pages 4-51. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report1.58 mb pdf
Preview
Mafwila, S. 2014. Part 2 - Independent review of the NMP Verification Programme Process. Independent Peer Reviews - Verification Studies, Sandpiper Project, pages 52-75. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report2.24 mb pdf
Preview
Part 3 - Appendices. Independent Peer Reviews - Verification Studies, Sandpiper Project, pages 76-94. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2014 Report1.13 mb pdf
Preview
Gibbons, M. 2012. Sandpiper Project - Environmental Impact Assessment for the proposed dredging of phosphate enriched sediments from Marine Licence Area No. 170. Appendix 1d: Marine Benthic Specialist Study for a Proposed Development of Phosphate Deposits in the Sandpiper Phosphate Licence Area off the Coast of Central Namibia - Jellyfish
  » More info & related results
2011 Report1.56 mb pdf
Preview
Midgley, J. 2012. Sandpiper Project - Environmental Impact Assessment for the proposed dredging of phosphate enriched sediments from Marine Licence Area No. 170. Appendix 2: Project supporting documentation
  » More info & related results
2012 Report1.7 mb pdf
Preview
Midgley, J. 2012. Sandpiper Project - Environmental Impact Assessment for the proposed dredging of phosphate enriched sediments from Marine Licence Area No. 170. Namibian Marine Phosphate (Pty) Ltd
  » More info & related results
2012 Report1.44 mb pdf
Preview
Midgley, J. 2012. Sandpiper Project - Environmental Impact Assessment for the proposed dredging of phosphate enriched sediments from Marine Licence Area No. 170. Chapter 3 - Project description
  » More info & related results
2012 Report3.29 mb pdf
Preview
Midgley, J. 2012. Sandpiper Project - Environmental Impact Assessment for the proposed dredging of phosphate enriched sediments from Marine Licence Area No. 170. Chapter 4 - Description of the affected environment
  » More info & related results
2012 Report2.73 mb pdf
Preview
Midgley, J. 2012. Sandpiper Project - Environmental Impact Assessment for the proposed dredging of phosphate enriched sediments from Marine Licence Area No. 170. Chapter 6 - Public consultation
  » More info & related results
2012 Report749 kb pdf
Preview
Midgley, J. 2012. Sandpiper Project - Environmental Impact Assessment for the proposed dredging of phosphate enriched sediments from Marine Licence Area No. 170. Chapter 8 - Environmental management plan
  » More info & related results
2012 Report919 kb pdf
Preview
Sowman, M., Scott, D., Green, L.J.F., Hara, M.M., Hauck, M., Kirsten, K., Paterson, B., Raemaekers, S., Jones, K., Sunde, J. and Turpie, J.K. 2013. Shallow waters: social science research in South Africa's marine environment. African Journal of Marine Science, 35(3): 385-402
  » More info & related results
2013 Journal Article
Glotin, P. 2016. Occurrence and distribution of cetaceans in Namibian waters
  » More info & related results
2016 Thesis
Moorsom, R. 1984. Exploiting the sea. A future for Namibia. Catholic Institute for International Relations, London, pp 123
  » More info & related results
1984 Book, Book Section, Booklet

» Links to useful free software for working with shapefiles, kml and kmz files, pdf files and more.