Transition from debris flow to hyperconcentrated flow in a submarine channel (the Cretaceous Cerro Toro Formation, southern Chile)

Sohn, Young Kwan; Choe, Moon Young; Jo, Hyung Rae

doi:10.1046/j.1365-3121.2002.00440.x

Cited by 103 publications

(89 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Measurement of the paleoflow directions by the authors on the basis of clast imbrication and sole marks reveals, however, that there are considerable variations in paleoflow directions among different facies and different outcrop localities. Above all, fairly consistent paleoflow directions were obtained from the Facies A conglomerates whereas the Facies B conglomerates have highly variable paleoflow directions, commonly at high angles to the overall trend of the presumed LSC channel axes (Sohn et al 2002). Sohn et al (2002) interpreted that the mass flows that formed the Facies B conglomerates originated from failure of nearby channel banks or slopes flanking the channel system, and their flow paths were strongly influenced by local topographic relief.…”

Section: Spatial Variations Of Channel-fill Characteristics and Paleomentioning

confidence: 83%

“…Above all, fairly consistent paleoflow directions were obtained from the Facies A conglomerates whereas the Facies B conglomerates have highly variable paleoflow directions, commonly at high angles to the overall trend of the presumed LSC channel axes (Sohn et al 2002). Sohn et al (2002) interpreted that the mass flows that formed the Facies B conglomerates originated from failure of nearby channel banks or slopes flanking the channel system, and their flow paths were strongly influenced by local topographic relief. On the other hand, the turbidity currents that formed the Facies A conglomerates have followed the overall trend of the LSC channel axes.…”

Section: Spatial Variations Of Channel-fill Characteristics and Paleomentioning

confidence: 83%

“…The conglomerates of this facies, previously termed the diamictites by Winn and Dott (1979), are interpreted to have resulted from composite mass-flow events, comprising a turbidity current, a gravelly hyperconcentrated flow, and a mud-rich debris flow (Sohn et al 2002). The erosional lower contact with well-developed flute and groove casts indicates an initial erosional event caused by a turbulent flow.…”

Section: Discussionmentioning

confidence: 95%

“…The development of normal grading in the upper division of some units is most likely due to incremental aggradation from a debris flow that was progressively finer-grained toward the rear part (Vallance and Scott 1997;Sohn et al 1999). Sohn et al (2002) interpreted that the composite mass flows resulted from progressive dilution of gravelly but cohesive debris flows that were generated by the failure of nearby channel banks or slopes flanking the channel system and experienced a full-scale dilution of the debris flows because of hydroplaning of the flow fronts.…”

Section: Discussionmentioning

confidence: 99%

“…The constituent facies are indicative of the deposition from mud-rich debris flows (Sohn et al 2002). The resultant deposits were probably sheet-like or tongueshaped with a lateral extent of hundreds of meters.…”

Section: Diamictitementioning

confidence: 98%

See 4 more Smart Citations

Sedimentary Facies and Architecture of a Gigantic Gravelly Submarine Channel System in a Cretaceous Foredeep Trough (the Magallanes Basin, Southern Chile)

Cheo¹,

Kim²,

Jo³

et al. 2017

Ocean and Polar Research

View full text Add to dashboard Cite

: The Lago Sofia conglomerate in southern Chile is a deep-marine gravelly deposit, which is hundreds of meters thick and kilometers wide and extends laterally for more than 100 km, filling the foredeep trough of the Cretaceous Magallanes Basin. For understanding the depositional processes and environments of this gigantic deep-sea conglomerate, detailed analyses on sedimentary facies, architecture and paleoflow patterns were carried out, highlighting the differences between the northern (Lago Pehoe and Lago Goic areas) and southern (Lago Sofia area) parts of the study area. The conglomerate bodies in the northern part occur as relatively thin (< 100 m thick), multiple units intervened by thick mudstone-dominated sequences. They show paleoflows toward ENE and S to SW, displaying a converging drainage pattern. In the southern part, the conglomerate bodies are vertically interconnected and form a thick (> 400 m thick) conglomerate sequence with rare intervening fine-grained deposits. Paleoflows are toward SW. The north-to-south variations are also distinct in sedimentary facies. The conglomerate bodies in the southern part are mainly composed of clast-supported conglomerate with sandy matrix, which is interpreted to be deposited from highly concentrated bedload layers under turbidity currents. Those in the northern part are dominated by matrix-to clast-supported conglomerate with muddy matrix, which is interpreted as the products of composite mass flows comprising a turbidity current, a gravelly hyperconcentrated flow and a mud-rich debris flow. All these characteristics suggest that the Lago Sofia conglomerate was formed in centripetally converging submarine channels, not in centrifugally diverging channels of submarine fans. The tributaries in the north were dominated by mass flows, probably affected by channel-bank failures or basin-marginal slope instability processes. In contrast, the trunk channel in the south was mostly filled by tractive processes, which resulted in the vertical and lateral accretion of gravel bars, deposition of gravel dunes and filling of scours and channels, similar to deposits of terrestrial gravel-bed rivers. The trunk channel developed along the axis of foredeep trough and its confinement within the trough is probably responsible for the thick, interconnected channel fills. The large-scale architecture of the trunk-channel fills shows an eastward offset stacking pattern, suggesting that the channel migrated eastwards most likely due to the uplift of the Andean Cordillera.

show abstract

Section: Spatial Variations Of Channel-fill Characteristics and Paleomentioning

confidence: 83%

Section: Spatial Variations Of Channel-fill Characteristics and Paleomentioning

confidence: 83%

Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: Diamictitementioning

confidence: 98%

See 3 more Smart Citations

Sedimentary Facies and Architecture of a Gigantic Gravelly Submarine Channel System in a Cretaceous Foredeep Trough (the Magallanes Basin, Southern Chile)

Cheo¹,

Kim²,

Jo³

et al. 2017

Ocean and Polar Research

View full text Add to dashboard Cite

show abstract

References

2017

Till: A Glacial Process Sedimentology

View full text Add to dashboard Cite

Carbonate‐rich megabeds within a Triassic siliciclastic deep‐water system, West Qinling orogenic belt, Central China: Character, processes and implications

Li,

Kneller,

Valdez Buso

2024

The Depositional Record

View full text Add to dashboard Cite

Deep‐water megabeds are a particular type of sediment gravity flow deposit that are anomalously thick and often of distinctive composition compared to the deep‐water strata within which they are embedded. Pure siliciclastic or carbonate megabeds have been widely reported from deep‐marine systems. Less documented are carbonate‐rich mixed megabeds with abundant carbonate clasts in a siliciclastic matrix, which are embedded in siliciclastic deep‐water systems. Here, such examples are reported from outcrops of the Lower Triassic in the West Qinling orogenic belt, central China, with a focus on the character, processes and implications of these carbonate‐rich megabeds. Based on regional geology and characteristics of the encasing siliciclastic turbidites and autochthonous micritic limestones, these megabeds are inferred to have been deposited in a deep marine trough. The megabeds are thick (1 to ca 10 m) compared to surrounding beds (commonly less than 1 m), and are of mixed composition, comprising both siliciclastic grains and shallow‐water carbonate clasts. These megabeds are commonly characterised by a distinctive bipartite or tripartite vertical succession of facies. A complete (tripartite) sequence consists of a basal clast‐supported conglomeratic division (Division I), an intermediate matrix‐supported conglomeratic division (Division II), and an upper normally graded and/or laminated sandy division (Division III). These divisions are interpreted to be deposited from evolving debris flows transitioning to turbidity currents during a single flow event, and are the result of flow deceleration and dilution. The megabeds show variability over very short lateral distances (several tens to a few hundred metres), possibly related to surface relief on the debritic portion of the deposit. A new depositional model is proposed for the mixed deep‐water system, with frequent siliciclastic turbidite deposition within this elongate basin from axially flowing turbidity currents, and episodic deposition from laterally‐supplied carbonate‐rich megaflows that eroded and incorporated the substrate during transport.

show abstract

Transition from debris flow to hyperconcentrated flow in a submarine channel (the Cretaceous Cerro Toro Formation, southern Chile)

Abstract: Debris flow and hyperconcentrated flow in a submarine channel • Y. K. Sohn et al.

Cited by 103 publications

References 25 publications

Sedimentary Facies and Architecture of a Gigantic Gravelly Submarine Channel System in a Cretaceous Foredeep Trough (the Magallanes Basin, Southern Chile)

Sedimentary Facies and Architecture of a Gigantic Gravelly Submarine Channel System in a Cretaceous Foredeep Trough (the Magallanes Basin, Southern Chile)

References

Carbonate‐rich megabeds within a Triassic siliciclastic deep‐water system, West Qinling orogenic belt, Central China: Character, processes and implications

Contact Info

Product

Resources

About