A Genetic Facies Tract for the Analysis of Sustained Hyperpycnal Flow Deposits

Zavala, Carlos; Arcuri, Mariano; Meglio, Mariano Di; Diaz, Helena Gamero; Contreras, Carmen

doi:10.1306/13271349st613438

Cited by 51 publications

(110 citation statements)

References 56 publications

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“…No 'light' (d 13 C value = À25 to À26&; Hedges et al, 1997) woody debris is found in the samples here. The absence of terrestrial materials (d 13 C value = À23 to À26&) in event beds in Core DH01 eliminates the idea of a hyperpycnal origin from either Chinese or Korean rivers, because flood related sediment gravity flow often carry continental organic matter (Mulder et al, 2003;Plink-Bj€ orklund & Steel, 2004;Zavala et al, 2011).…”

Section: Source Of Organic Matter and Bathymetry Data Reveal Local Er...mentioning

confidence: 99%

“…Hyperpycnal flow represents one of the most common triggers for initiation of slides, debris flows and turbidity currents (Mulder et al, , 2003. The abundance of continental materials such as leaves and coal fragments are considered diagnostic in such deposits (Mulder et al, 2003;Plink-Bj€ orklund & Steel, 2004;Zavala et al, 2011;Steel et al, 2016). The organic geochemical, bathymetry and REE data (see Discussion in the Implications for provenance section) indicate that the sedimentary processes are local within the mud patch area.…”

Section: Mid Shelf Of the East China Sea Hybrid Sediment Gravity Flow...mentioning

confidence: 99%

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Carbon isotope and rare earth element composition of Late Quaternary sediment gravity flow deposits on the mid shelf of East China Sea: Implications for provenance and origin of hybrid event beds

et al. 2019

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The East China Sea Shelf has an unusually wide and low gradient shelf, supplied from sediment-charged rivers and large river delta systems, with bottom currents sweeping the sea floor and located in the path of strong typhoons. Sediment gravity flow deposits, including four hybrid event beds and a high density turbidite, are identified in a core from the mid-shelf of the East China Sea. The hybrid event beds typically comprise three or two internal divisions from the base to the top: (i) H1, H3 and H5; or (ii) H3 and H5. Radiocarbon ages of the hybrid event beds were in the range of 3821 to 8526 yr BP. Based on correlation with surrounding cores, the hybrid events may have happened at any time between 1930 yr BP and 3890 yr BP. The d 13 C values in hybrid event beds together with bathymetry data suggest local erosion on the shelf. The average d 13 C value for the H1 division is similar to the H3 division in the hybrid event beds, implying that the organic matter in the H1 and H3 divisions may come from the same source area. Cross-plots of upper continental crust normalized rare earth elements in the five units reveal that the sediment source of the four hybrid event beds and the turbidite was ultimately primarily from Korean rivers. Partial transformation from a moderate-strength debris flow with the additional role of erosional bulking can explain occurrences of hybrid event beds on the East China Sea Shelf. The data indicate that hybrid sediment gravity flow deposits were 1861 sourced from intra-shelf failures and subsequently transformed and deposited as hybrid event beds. The study shows that hybrid sediment gravity flows and turbidity currents may not necessarily indicate proximity to a major fluvial or deltaic system and that intra-shelf sedimentation can be a sediment source. It is unlikely that the debris flows and turbidity currents were triggered by a hyperpycnal flow or tsunami, because both can carry continental and/or coastal signals which have not been recognized in the core. Typhoons are the probable triggering mechanism.

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Section: Source Of Organic Matter and Bathymetry Data Reveal Local Er...mentioning

confidence: 99%

Section: Mid Shelf Of the East China Sea Hybrid Sediment Gravity Flow...mentioning

confidence: 99%

Carbon isotope and rare earth element composition of Late Quaternary sediment gravity flow deposits on the mid shelf of East China Sea: Implications for provenance and origin of hybrid event beds

et al. 2019

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“…The authors note that such a model could also result in deposits similar to turbidites+homogenites. Turbidite lofting resulting from suspension clouds in relation to hyperpycnal flows (Zavala et al ., 2011), or ‘dilute plume’ river deposition (Hizzett et al ., 2018; Hage et al ., 2019), could also result in sand–mud couplets with sharp transitions, but are typically more rhythmic in nature and more abundant in plant remains than surge‐like gravity reworking deposits (Zavala & Acuri, 2016).…”

Section: Discussionmentioning

confidence: 99%

“…In contrast to the larger (>10 cm) event deposits mentioned above, for smaller event deposits without a complex turbidite base, microfracturing and evidence for ongoing oscillations, like event deposit 3 in U‐Channel 4 ( ca 2 cm), the authors consider processes other than gravity reworking similarly possible. As mentioned before ( Turbidites and homogenites: brief reminders section), the sharp grain‐size breaks within the TuHm deposits can also be interpreted as the result of turbidite lofting (Zavala et al ., 2011) or fluid mud layers that hinder the settling of non‐cohesive grains (Stevenson et al ., 2014). In future work, one possible way to help distinguish the depositional mechanism is to look in more detail to organic content within the sedimentary event deposits (Zavala & Arcuri, 2016).…”

Section: Discussionmentioning

confidence: 99%

Multi‐scale and multi‐parametric analysis of Late Quaternary event deposits within the active Corinth Rift (Greece)

et al. 2022

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A major challenge in subaqueous palaeoseismology is to understand the relationship between an earthquake/tsunami and a sedimentary event deposit recorded in drillcores. Expedition 381 of the International Ocean Discovery Program was dedicated to understanding the development of the Corinth Rift, Greece. Its drilled cores provide a potentially important resource to better understand depositional mechanisms of sedimentary event deposits within changing open marine to (semi-)isolated environments. To achieve this, Uchannels and spatula samples were analysed from the topmost part (0-65 m below seafloor maximum depth) of holes M0078B and M0079A (ca 0-25 ka), using high-resolution X-ray microtomography in combination with grain-size, magnetic and X-ray fluorescence measurements. Structures and grain fabric are resolved down to 10 lm in voxel size, characterizing the geometry of the basal surface of 'turbidite+homogenite' sedimentary event deposits, and the internal base-upward evolution at high-resolution scale. This analysis suggests that these types of deposits are more complex than previously proposed, especially at the transition between the basal coarse turbidite sub-unit and the fine-grained homogenite upper sub-unit, as well as within the homogenite. Combined with the other observations and parameters, X-ray microtomography results are consistent with the interpretation of the Corinth 'turbidite+homogenite' deposits as having predominantly originated from seismic and/or aseismic slope failures followed by tsunami/seiche effects, despite subtle differences according to depositional environment.

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“…(i) the dominance of mud-grade sediment delivered to the basin (river-floods); and (ii) a distal position relative to the feeder system. MF3 may have originated with the plunging of sustained sedimentladen turbulent flows (hyperpycnal flows), the suspended load being mainly composed of a clay-silt fraction (e.g., Mulder and Alexander, 2001;Mulder et al, 2003;Zavala et al, 2011. As these flows can combine suspension fallout and traction, sedimentary structures may form, as observed in the upper part of the sequence (Fig.…”

Section: Mf3: Muddy Hyperpycnitementioning

confidence: 99%

Siliciclastic and bioclastic contouritic sands: Textural and geochemical characterisation

Castro

Miramontes

Dorador

et al. 2021

Marine and Petroleum Geology

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A Genetic Facies Tract for the Analysis of Sustained Hyperpycnal Flow Deposits

Cited by 51 publications

References 56 publications

Carbon isotope and rare earth element composition of Late Quaternary sediment gravity flow deposits on the mid shelf of East China Sea: Implications for provenance and origin of hybrid event beds

Carbon isotope and rare earth element composition of Late Quaternary sediment gravity flow deposits on the mid shelf of East China Sea: Implications for provenance and origin of hybrid event beds

Multi‐scale and multi‐parametric analysis of Late Quaternary event deposits within the active Corinth Rift (Greece)

Siliciclastic and bioclastic contouritic sands: Textural and geochemical characterisation

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