Density-Flow Deposition In A Fresh-Water Lacustrine Rift Basin, Paleogene Bach Long Vi Graben, Vietnam

Hovikoski, Jussi; Therkelsen, Jens; Nielsen, Lars Henrik; Bojesen‐Koefoed, Jørgen A.; Nytoft, Hans Peter; Petersen, Henrik I.; Abatzis, Ioannis; Tuấn, Hoàng Anh; Phuong, Bui Thi Ngoc; Dao, Cao Van; Fyhn, Michael B.W.

doi:10.2110/jsr.2016.53

Cited by 31 publications

(12 citation statements)

References 51 publications

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“…This is consistent with seasonal varve sedimentation. www.nature.com/scientificreports/ www.nature.com/scientificreports/ www.nature.com/scientificreports/ Secondary facies include cm-scale silty to sandy mudstone beds interpreted as gravity flow deposits 17 . The beds comprise a basal silty mudstone layer commonly overlain by a pale mudstone interval rich in biogenic silica, which is further overlain by a graded mud-drape interpreted as suspension fall-out.…”

Section: Results and Interpretationmentioning

confidence: 99%

“…1). Previous studies have indicated that the studied deposits represent a deep, freshwater, oil-prone rift lake system [15][16][17][18] , deposited during the upper Oligocene 18,19 . The rift basin was relatively sediment starved and intermittently, throughout its existence, received phosphate-rich sediments from a single footwall block 20 .…”

Section: Study Area and Analytical Approachmentioning

confidence: 98%

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Factors controlling accumulation of organic carbon in a rift-lake, Oligocene Vietnam

Rizzi

Hovikoski

Schovsbo

et al. 2020

Sci Rep

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Understanding of the processes of petroleum source rock (SR) accumulation in lacustrine rift basins and the behavior of lake systems as long-term carbon sinks is fragmentary. Investigation of an 800 m thick (500 m core and ~ 300 m outcrop), deep-lacustrine, Oligocene section in Vietnam, provides a rare insight into the controls and deposition of organic carbon (OC) and SR formation in continental rift basins. A multidisciplinary dataset, combining elemental data, inorganic and organic geochemistry with sedimentology, shows that the richest alginite-prone, sapropelic SR developed during periods of relative tectonic quiescence characterized by moderate primary productivity in a mainly dysoxic lacustrine basin. Increased rift activity and further development of graben morphology intensified water column stratification and anoxia, which hindered nutrient recycling. Sapropelic organic matter (OM) continued to accumulate, but with increasing amorphous OM content and decreasing total OC values. Periods of increased seasonality were characterized by thermocline weakening, enhanced mixing of water columns, increased primary productivity and diatom blooming. The results suggest that a change from dysoxia towards anoxia or extreme primary productivity does not necessarily enhance OC burial and SR quality. External nutrient input from a phosphate-rich hinterland is sufficient for sapropel formation, whereas the main limiting factor is methanogenesis.

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Section: Results and Interpretationmentioning

confidence: 99%

Section: Study Area and Analytical Approachmentioning

confidence: 98%

Factors controlling accumulation of organic carbon in a rift-lake, Oligocene Vietnam

Rizzi

Hovikoski

Schovsbo

et al. 2020

Sci Rep

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“…a wide range of deep-water sub-environments, and attributed to a variety of depositional processes (e.g. Talling et al, 2004;Baas et al, 2009;Haughton et al, 2009;Hodgson, 2009;Patacci and Haughton, 2014;Hovikoski et al, 2016;Tinterri et al, 2016;Kane et al, 2017). Here, poorly-sorted divisions (D3 and D4) are interpreted to be deposited from predominantly cohesive flows.…”

Section: Generation Of Hybrid Beds Through Flow Deflection---hybrid mentioning

confidence: 95%

Topographic Controls On the Development of Contemporaneous but Contrasting Basin-Floor Depositional Architectures

Bell

Stevenson

Kane

et al. 2018

Journal of Sedimentary Research

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“…Some authors have published illustrations of bed types that include thicker mudstone caps for turbidites compared to HEBs (for example, fig. 14 of Hovikoski et al, 2016), but without an accompanying discussion. In order to confirm that the observed differences in sand to mud ratios are not only due to the different geometry of the beds but represent a real difference in the sand to mud volumetric ratio, a confined system with very long-distance correlations should be considered.…”

Section: Observations From Other Turbidite Systemsmentioning

confidence: 99%

Origin of mud in turbidites and hybrid event beds: Insight from ponded mudstone caps of the Castagnola turbidite system (north‐west Italy)

et al. 2020

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The partitioning of different grain‐size classes in gravity flow deposits is one of the key characteristics used to infer depositional processes. Turbidites have relatively clean sandstones with most of their clay deposited as part of a mudstone cap or as a distal mudstone layer, whereas sand‐bearing debrites commonly comprise mixtures of sand grains and interstitial clay; hybrid event beds develop alternations of clean and dirty (clay‐rich) sandstones in varying proportions. Analysis of co‐genetic mudstone caps in terms of thickness and composition is a novel approach that can provide new insight into gravity flow depositional processes. Bed thickness data from the ponded Castagnola system show that turbidites contain more clay overall than do hybrid event beds. The Castagnola system is characterized by deposits of two very different petrographic types. Thanks to this duality, analyses of sandstone and mudstone composition allow inference of which proportion of the clay in each of the deposit types was acquired en route. In combination with standard sedimentological observations the new data allow insight into the likely characteristics of their parent flows. Clean turbidites were deposited by lower concentration, long duration, erosive, muddy turbidity currents which were more efficient at fractionating clay particles away from their basal layer. Hybrid event beds were deposited by shorter duration, higher‐concentration, less‐erosive sandier flows which were less efficient at clay fractionation. The results are consistent with data from other turbidite systems (for example, Marnoso‐arenacea). The approach represents a new method to infer the controls on the degree of clay partitioning in gravity flow deposits.

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Density-Flow Deposition In A Fresh-Water Lacustrine Rift Basin, Paleogene Bach Long Vi Graben, Vietnam

Cited by 31 publications

References 51 publications

Factors controlling accumulation of organic carbon in a rift-lake, Oligocene Vietnam

Factors controlling accumulation of organic carbon in a rift-lake, Oligocene Vietnam

Topographic Controls On the Development of Contemporaneous but Contrasting Basin-Floor Depositional Architectures

Origin of mud in turbidites and hybrid event beds: Insight from ponded mudstone caps of the Castagnola turbidite system (north‐west Italy)

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