‘Hummocky cross‐stratification‐like structures in deep‐sea turbidites: Upper Cretaceous Basque basins (Western Pyrenees, France)’ by Mulder <i>et al.</i> (2009), <i>Sedimentology</i>, 56, 997–1015: Discussion

Higgs, Roger

doi:10.1111/j.1365-3091.2010.01163.x

Cited by 14 publications

(8 citation statements)

References 23 publications

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“…Higgs (2010) disputes the deep-sea origin of HCS advocated by Mulder et al (2009). Furthermore, the concept of stratified layers in high-density turbidity currents is itself debated (Shanmugam 1996).…”

Section: Lack Of Evidence For Deep-water Depositionmentioning

confidence: 99%

Discussion of He et al. (2011, Geo-Marine Letters) Evidence of internal-wave and internal-tide deposits in the Middle Ordovician Xujiajuan Formation of the Xiangshan Group, Ningxia, China

Shanmugam

2011

Geo-Mar Lett

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Section: Lack Of Evidence For Deep-water Depositionmentioning

confidence: 99%

Discussion of He et al. (2011, Geo-Marine Letters) Evidence of internal-wave and internal-tide deposits in the Middle Ordovician Xujiajuan Formation of the Xiangshan Group, Ningxia, China

Shanmugam

2011

Geo-Mar Lett

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“…In the Discussion, Higgs (2009) criticizes the interpretation of Mulder et al. (2009a) concerning sedimentary features called hummocky cross‐stratification (HCS)‐like features as related to deep‐water (water depth >1000 m) turbidite processes.…”

Section: Introductionmentioning

confidence: 99%

“…It is true that most of the work on this area is older than 1990. Therefore, Higgs (2009) drew the conclusion that the Flysch Basque Basin was deposited in a shallow‐water environment dominated by storm‐wave action.…”

Section: Introductionmentioning

confidence: 99%

“… Ichnofauna and benthic foraminifera. Erosion and sedimentary structures that can be found both in tempestites and turbidites. The North Pyrenean Megaturbidite (NPM) interpreted by Higgs (2009) as a forced regressive‐nearshore sand. Mass flow‐deposits (slump and debrites) that could be ‘tsunamites’. …”

Section: Introductionmentioning

confidence: 99%

“…The North Pyrenean Megaturbidite (NPM) interpreted by Higgs (2009) as a forced regressive‐nearshore sand.…”

Section: Introductionmentioning

confidence: 99%

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Reply to the Discussion by Roger Higgs on ‘Hummocky cross‐stratification‐like structures in deep‐sea turbidites: Upper Cretaceous Basque basins (Western Pyrenees, France)’ by Mulder et al., Sedimentology, 56, 997–1015

Mulder¹,

Razin

Faugères³

et al. 2011

Sedimentology

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Dune bedforms produced by dilute pyroclastic density currents from the August 2006 eruption of Tungurahua volcano, Ecuador

et al. 2013

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A series of pyroclastic density currents were generated at Tungurahua volcano (Ecuador) during a period of heightened activity in August 2006. Dense pyroclastic flows were confined to valleys of the drainage network, while dilute pyroclastic density currents overflowed on interfluves where they deposited isolated bodies comprising dune bedforms of cross-stratified ash exposed on the surface. Here, the description, measurement, and classification of more than 300 dune bedforms are presented. Four types of dune bedforms are identified with respect to their shape, internal structure, and geometry (length, width, thickness, stoss and lee face angles, and stoss face length). (1) “Elongate dune bedforms” have smooth shapes and are longer (in the flow direction) than wide or thick. Internal stratification consists of stoss-constructional, thick lensoidal layers of massive and coarse-grained material, alternating with bedsets of fine laminae that deposit continuously on both stoss and lee sides forming aggrading structures with upstream migration of the crests. (2) “Transverse dune bedforms” show linear crests perpendicular to the flow direction, with equivalent lengths and widths. Internally, these bedforms exhibit finely stratified bedsets of aggrading ash laminae with upstream crest migration. Steep truncations of the bedsets are visible on the stoss side only. (3) “Lunate dune bedforms” display a barchanoidal shape and have stratification patterns similar to those of the transverse ones. Finally, (4) “two-dimensional dune bedforms” are much wider than long, exhibit linear crests and are organized into trains. Elongate dune bedforms are found exclusively in proximal deposition zones. Transverse, lunate, and two-dimensional dune bedforms are found in distal ash bodies. The type of dune bedform developed varies spatially within an ash body, transverse dune bedforms occurring primarily at the onset of deposition zones, transitioning to lunate dune bedforms in intermediate zones, and two-dimensional dune bedforms exclusively on the lateral and distal edges of the deposits. The latter are also found where flows moved upslope. Elongate dune bedforms were deposited from flows with both granular-based and tractional flow boundaries that possessed high capacity and competence. They may have formed in a subcritical context by the blocking of material on the stoss side. We do not interpret them as antidune or “chute-and-pool” structures. The dimensions and cross-stratification patterns of transverse dune bedforms are interpreted as resulting from low competence currents with a significant deposition rate, but we rule out their interpretation as “antidunes”. A similar conclusion holds for lunate dune bedforms, whose curved shape results from a sedimentation rate dependent on the thickness of the bedform. Finally, two-dimensional dune bedforms were formed where lateral transport exceeds longitudinal transport; i.e., in areas where currents were able to spread laterally in low velocity zones. We suggest that the aggrading ash bedse...

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‘Hummocky cross‐stratification‐like structures in deep‐sea turbidites: Upper Cretaceous Basque basins (Western Pyrenees, France)’ by Mulder et al. (2009), Sedimentology, 56, 997–1015: Discussion

Cited by 14 publications

References 23 publications

Discussion of He et al. (2011, Geo-Marine Letters) Evidence of internal-wave and internal-tide deposits in the Middle Ordovician Xujiajuan Formation of the Xiangshan Group, Ningxia, China

Discussion of He et al. (2011, Geo-Marine Letters) Evidence of internal-wave and internal-tide deposits in the Middle Ordovician Xujiajuan Formation of the Xiangshan Group, Ningxia, China

Reply to the Discussion by Roger Higgs on ‘Hummocky cross‐stratification‐like structures in deep‐sea turbidites: Upper Cretaceous Basque basins (Western Pyrenees, France)’ by Mulder et al., Sedimentology, 56, 997–1015

Dune bedforms produced by dilute pyroclastic density currents from the August 2006 eruption of Tungurahua volcano, Ecuador

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