Depositional architecture and sequence stratigraphy of the Karoo basin floor to shelf edge succession, Laingsburg depocentre, South Africa

Flint, Stephen S.; Hodgson, David M.; Sprague, A. R.; Brunt, Rufus L.; Merwe, Willem C. van der; Figueiredo, José Henrique Cunha; Prélat, Amandine; Box, D.; Celma, Claudio Di; Kavanagh, John P.

doi:10.1016/j.marpetgeo.2010.06.008

Cited by 132 publications

(169 citation statements)

References 61 publications

(93 reference statements)

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“…Previous models for basin infilling based on palaeoflow and provenance analysis concluded that sediment was transported into the basin mainly from the south; this model would predict stratigraphic younging of ash beds northward (Veevers et al 1994a;Rubidge 2000;Flint et al 2011). However, this scenario appears to conflict with the observed older zircon ages in Beaufort Group tuffs that lie to the north of the younger Ecca Group ash samples.…”

Section: Maximum Depositional Ages From U-pb Zircon Analysesmentioning

confidence: 81%

“…The lowermost Ecca Group is mudstonedominated at the base (Prince Albert, Whitehill, Collingham, Vischkuil, and Tierberg formations) and is overlain by basinfloor, sandy turbidite strata (Skoorsteenberg, Laingsburg, and Ripon formations; Bouma and Wickens 1994;Catuneanu et al 2002). The upper Ecca Group consists of submarine slope channel/levee systems (Fort Brown Formation; Hodgson et al 2011) and shelf-edge and shelf clastics (Kookfontein and Waterford formations; Wild et al 2009;Flint et al 2011;Jones et al 2013) that record diachronous filling of the basin (Rubidge 2000). The Beaufort Group records the transition to terrestrial deposystems and evolution of terrestrial vertebrates and macroflora (Groenewald and Kitching 1995;Smith 1995;Gastaldo et al 2005).…”

Section: Geologic Backgroundmentioning

confidence: 99%

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U-PB zircon tuff geochronology from the Karoo Basin, South Africa: implications of zircon recycling on stratigraphic age controls

McKay

Weislogel

Fildani³

et al. 2015

International Geology Review

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Along the >650 km long southern margin of the Karoo Basin in South Africa, we traversed four evenly spaced stratigraphic transects and collected 22 samples of volcanic, air-fall tuffs thought to be distal deposits derived from the Permian-Triassic Southern Gondwanan volcanic arc. We present 469 new U-Pb zircon ages determined by sensitive high-resolution ion microprobe reverse geometry (SHRIMP-RG) at the Stanford-USGS Microanalytical Center in order to constrain the maximum depositional ages for the southern Karoo Basin strata. Weighted means of these youngest coherent zircon populations were selected to maximize the number of analyses while minimizing the mean square weighted deviation (MSWD) to increase the robustness and decrease the influence of Pb-loss and inheritance in determining the maximum depositional age. Maximum depositional ages for the marine Ecca Group range from 250 to 274 Ma, whereas in the conformably overlying terrestrial Beaufort Group maximum depositional ages ranged from 257 to 452 Ma. Across the southern Karoo Basin, the Ecca Group tuffs produce maximum depositional ages that young upward; however, the Beaufort Group tuffs yield maximum depositional ages that are geochronologically out of sequence. Furthermore, maximum depositional ages of the Beaufort Group tuffs are consistently older than ash ages within the underlying marine strata. Our results are supported by previously published U-Pb tuff zircon geochronology in the Karoo Basin and demonstrate that the presence of out-of-sequence, older tuff ages are repeatable in Beaufort Group tuffs along the southern margin of the basin. We propose that tuffs in the Karoo Basin are correlative with tuffs in southern South America, and that the age spectra of these tuffs were influenced by magmatic crustal recycling. We use these data to highlight the complexity of U-Pb zircon datasets from tuffs, address the use of U-Pb zircon ages to provide absolute age controls, and discuss the implications of these new age controls on the Permian-Triassic Karoo strata.

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Section: Maximum Depositional Ages From U-pb Zircon Analysesmentioning

confidence: 81%

Section: Geologic Backgroundmentioning

confidence: 99%

U-PB zircon tuff geochronology from the Karoo Basin, South Africa: implications of zircon recycling on stratigraphic age controls

McKay

Weislogel

Fildani³

et al. 2015

International Geology Review

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“…The outcrops provide a unique opportunity to study the depositional architecture of deep-water systems across multiple stratigraphic scales, from sedimentary facies-to seismic-scale, and are considered a valuable field analogue (Hodgson et al, 2011a;Flint et al, 2011;Morris et al 2014). …”

Section: Regional Settingmentioning

confidence: 99%

“…Grecula et al 2003;Flint et al 2011;Hodgson et al 2011a;Brunt et al, 2013b;van der Merwe et al, 2014;Jones et al 2015). Post-depositional deformation around Laingsburg was previously constrained for a small area (Newton 1993(Newton , 1995, so published paleogeographic reconstructions (e.g.…”

Section: Reservoir Analogue Implicationsmentioning

confidence: 99%

“…1; 2), have been utilised as an analogue for sub-seismic scale depositional elements, and facies distributions for many hydrocarbon fields (e.g. Grecula et al, 2003, Sixsmith et al, 2004, Hodgson et al, 2011aFlint et al, 2011;Di Celma et al, 2011;Brunt et al, 2013a, b;Morris et al, Interpretation 5 2014). Detailed studies have culminated in the correlation of stacked deep water composite sequences across the Karoo Basin over a >2500km 2 area, allowing high resolution study of the evolution of a basin through the stages of its fill (Van der Merwe et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Palinspastic restoration of an exhumed deepwater system: A workflow to improve paleogeographic reconstructions

et al. 2015

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Submarine landslides of the Mediterranean Sea: Trigger mechanisms, dynamics, and frequency-magnitude distribution

Úrgeles

Camerlenghi

2013

J. Geophys. Res. Earth Surf.

175

135

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[1] Submarine landslides are ubiquitous along Mediterranean continental margins. With the aim of understanding mass-wasting processes and related hazard at the scale of a large marine basin encompassing multiple geological settings, we have compiled data on their geometry, age, and trigger mechanism with a geographic information system. The distribution of submarine landslides in the Mediterranean reveals that major deltaic wedges have a higher density of large submarine landslides, while tectonically active margins are characterized by relatively small failures. In all areas, landslide size distributions display power law scaling for landslides > 1 km 3 . We find consistent differences on the exponent of the power law (θ) depending on the tectonic setting. Available age information suggests that failures exceeding 1000 km 3 are infrequent and may recur every~40 kyr. Smaller failures that can still cause significant damage might be relatively frequent (failures > 1 km 3 may recur every 40 years). The database highlights that our knowledge of submarine landslide activity with time is limited to a few tens of thousands of years. Available data suggest that submarine landslides may preferentially occur during lowstand periods, but no firm conclusion can be made on this respect, as only 70 landslides (out of 696 in the database) have relatively accurate age determinations. The temporal pattern and changes in frequency-magnitude distribution suggest that sedimentation patterns and pore pressure development have had a major role in triggering slope failures and control the sediment flux from mass wasting to the deep basin.Citation: Urgeles, R., and A. Camerlenghi (2013), Submarine landslides of the Mediterranean Sea: Trigger mechanisms, dynamics, and frequency-magnitude distribution,

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Depositional architecture and sequence stratigraphy of the Karoo basin floor to shelf edge succession, Laingsburg depocentre, South Africa

Cited by 132 publications

References 61 publications

U-PB zircon tuff geochronology from the Karoo Basin, South Africa: implications of zircon recycling on stratigraphic age controls

U-PB zircon tuff geochronology from the Karoo Basin, South Africa: implications of zircon recycling on stratigraphic age controls

Palinspastic restoration of an exhumed deepwater system: A workflow to improve paleogeographic reconstructions

Submarine landslides of the Mediterranean Sea: Trigger mechanisms, dynamics, and frequency-magnitude distribution

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