Long-term controls on continental-scale bedrock river terrace deposition from integrated clast and heavy mineral assemblage analysis: An example from the lower Orange River, Namibia

Nakashole, Albertina; Hodgson, David M.; Chapman, Robert J.; Morgan, D. J.; Jacob, Roger Jürgen

doi:10.1016/j.sedgeo.2017.12.010

Cited by 8 publications

(4 citation statements)

References 123 publications

(169 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At present, the interior of the plateau is almost entirely drained by the west‐draining Orange River system. Evidence from much higher sediment flux rates on the west coast than the south and east coasts (e.g., Baby et al., 2020; Guillocheau et al., 2012; Tinker et al., 2008a) and the locations of detrital diamond on the west coast sourced from the Kaapvall Craton (Bluck et al., 2005; Nakashole et al., 2018; Phillips & Harris, 2009; Phillips et al., 2018) show that the plateau has been west‐draining since Gondwana breakup. Drainage reconstructions suggest some reorganization of plateau drainage since the Cretaceous, but most suggest the dominance of large, west‐draining river systems (M. C. J. de Wit, 1999; Dingle & Hendry, 1984; Partridge & Maud, 1987; Stevenson & McMillan, 2004).…”

Section: Introductionmentioning

confidence: 99%

Constraining Plateau Uplift in Southern Africa by Combining Thermochronology, Sediment Flux, Topography, and Landscape Evolution Modeling

et al. 2021

View full text Add to dashboard Cite

The southern African Plateau is a dominant feature of African topography reaching heights of >3,000 m, with an average elevation of 1,000 m in the predominantly low relief plateau interior. The elevated margins of the plateau drop through higher relief regions to the coastal plain (Figure 1). However, extensive debate remains regarding when and how it formed. The long wavelength topographic high in absence of collisional tectonism combined with Cretaceous kimberlite activity and a large low shear velocity province (LLSVP) in the deep mantle below southern Africa have led many to suggest uplift related to mantle processes. Given that surface uplift may be related to LLSVP development (e.g., Lithgow-Bertelloni & Silver, 1998), better

show abstract

Section: Introductionmentioning

confidence: 99%

Constraining Plateau Uplift in Southern Africa by Combining Thermochronology, Sediment Flux, Topography, and Landscape Evolution Modeling

et al. 2021

View full text Add to dashboard Cite

show abstract

“…In these cases it may be possible to establish the host lithology source of mineral grains through trace element analysis (e.g. Canil et al, 2016;Nakashole et al, 2018). HMC data sets rarely provide direct information on the nature of source Au mineralization because sulfides and other ore minerals do not survive in oxidising surficial environments.…”

Section: Evaluation Of the Strengths And Weaknesses Of Each Methods Anmentioning

confidence: 99%

Integration of Detrital Gold Microchemistry, Heavy Mineral Distribution, and Sediment Geochemistry to Clarify Regional Metallogeny in Glaciated Terrains: Application in the Caledonides of Southeast Ireland

Moles

Chapman

2019

Economic Geology

View full text Add to dashboard Cite

including the URL of the record and the reason for the withdrawal request. Economic Geology Integration of detrital gold microchemistry, heavy mineral distribution and sediment geochemistry to clarify regional metallogeny in glaciated terrains: application in the Caledonides of southeast Ireland-Manuscript Draft-Manuscript Number: SEG-D-18-00134R2 Full Title: Integration of detrital gold microchemistry, heavy mineral distribution and sediment geochemistry to clarify regional metallogeny in glaciated terrains: application in the Caledonides of southeast Ireland Article Type: Regular Paper

show abstract

“…There also exists a small population of cactiform and succulent plants in the far-off river zones, which are adapted to dry climate by storing large amounts of water in their stems and enduring extended periods of dryness [35]. In Namibia, the lower Orange River incises through the Mesoproterozoic Namaqua Metamorphic Complex between Noordoewer and Oranjemund (the river's mouth) before cutting the Neoproterozoic Gariep Belt (the southern arm of the Damara Orogen) close to the river's mouth on the Atlantic Ocean seaside [36]. Journal of Materials Science and Chemical Engineering…”

Section: Study Areamentioning

confidence: 99%

A Pilot Study on the Concentration of Heavy Metals in Sediments from the Lower Orange River, //Karas Region, Namibia

Pitiya¹,

Jacob²,

Emilinot³

2022

MSCE

View full text Add to dashboard Cite

Global water shortage is caused not just by the physical scarcity of water, but also by gradual deterioration of the quality of water resources such as lakes, streams and rivers with heavy metals. This present study evaluated the status of Mn, Fe, Cr, Cu, Ni, As, Zn, Pb and Cd in sediments from the lower Orange River by Inductively Coupled Plasma Atomic Emission Spectrometry technique by collecting a total of eleven samples, each weighing 1 -2 kg at the depth of 15 -20 cm from two observations sites along the lower Orange River and applying pollution indicators such as contamination factor(CF), pollution load index(PLI), index of geo-accumulation(I geo ) and enrichment factor(EF) to assay the nature and extent of heavy metals contamination in sediments. The sequence of the total heavy metal content in descending order was Fe > Mn > Cr > As > Zn > Ni > Cu > Pb > Cd. The results of CF and I geo showed Mn, Cd, Ni, Zn and Pb were minor sources of sediment contamination since most of the samples were unpolluted and moderately polluted by these metals. However, most sediments were moderate to considerably polluted with Cr, As and Fe suggesting that these were the major pollution sources. The value of PLI at one of the two observation sites was equivalent to the value of baseline level, while the next site indicted quality deterioration of the sediments. The EF revealed that Cr was moderately enriched and arsenic (As) significantly enriched in all the sediments, which suggested contamination due to anthropogenic intervention. Hence, it is recommended that sediment quality be evaluated on a regular basis to avoid further deterioration of the Orange River's health, which might have detrimental repercussions for both aquatic life and local communities along the river.

show abstract

Long-term controls on continental-scale bedrock river terrace deposition from integrated clast and heavy mineral assemblage analysis: An example from the lower Orange River, Namibia

Abstract: This is a repository copy of Long-term controls on continental-scale bedrock river terrace deposition from integrated clast and heavy mineral assemblage analysis: an example from the lower Orange River, Namibia.

Cited by 8 publications

References 123 publications

Constraining Plateau Uplift in Southern Africa by Combining Thermochronology, Sediment Flux, Topography, and Landscape Evolution Modeling

Constraining Plateau Uplift in Southern Africa by Combining Thermochronology, Sediment Flux, Topography, and Landscape Evolution Modeling

Integration of Detrital Gold Microchemistry, Heavy Mineral Distribution, and Sediment Geochemistry to Clarify Regional Metallogeny in Glaciated Terrains: Application in the Caledonides of Southeast Ireland

A Pilot Study on the Concentration of Heavy Metals in Sediments from the Lower Orange River, //Karas Region, Namibia

Contact Info

Product

Resources

About