Sediment export from the Sepik River, Papua New Guinea: evidence for a divergent sediment plume

Kineke, Gail C.; Woolfe, Ken J.; Kuehl, Steven A.; Milliman, John D.; Dellapenna, Timothy M.; Purdon, Richard G.

doi:10.1016/s0278-4343(00)00069-8

Cited by 164 publications

(104 citation statements)

References 44 publications

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“…They are in fact quite common at the mouths of most contemporaneous rivers (Mulder and Syvitski, 1995;Kineke et al, 2000;Johnson et al, 2001;Mulder et al, 2001Mulder et al, , 2003 and pass downslope into normal turbidity currents at depths of a few tens of meters (Lamb and Mohrig, 2009), which would concur with our interpretation of most of the Navidad sandstones as shallow water sediments deposited in the vicinity of river mouths and possibly deltas. The shallow water molluscs recorded within them could therefore be attributed to their in situ occurrence, without having to explain the contradiction of their association with leaf accumulations.…”

Section: Sedimentary Environment Of the Navidad Formationsupporting

confidence: 86%

Reply to Comment of Encinas et al. (2014) on: ‘Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, climatic and tectonic implications’ of Gutiérrez et al. (2013, Andean Geology 40 (1): 66-78).

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Gutiérrez

Hinojosa

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Section: Sedimentary Environment Of the Navidad Formationsupporting

confidence: 86%

Reply to Comment of Encinas et al. (2014) on: ‘Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, climatic and tectonic implications’ of Gutiérrez et al. (2013, Andean Geology 40 (1): 66-78).

Roux

Gutiérrez

Hinojosa

et al. 2014

Andgeo

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“…This has led to the prevailing dogma that continental shelf sediments are hemipelagic in nature, i.e., composed of a mixture of fine biogenic particles derived from marine production (5-75% by volume) and terrigenous silt (Shanmugam et al, 1985;Stow et al, 1985). However, it is becoming increasingly recognized that some LDEs (e.g., Sepik, Ganges-Brahmaputra, Eel, and Rhone) are characterized by direct export of large volumes of sediment and OM to the lower continental margin due to: (1) a narrow (active continental margin) shelf (Kineke et al, 2000;Mullenbach and Nittrouer, 2006); (2) progradation of the deltaic clinoform in the late Holocene near to the shelf edge (Coleman et al, 1998); (3) density-driven, cold shelf water (winter) advection (Puig and Palanques, 1998); or (4) landward incision of the associated submarine canyon so that it intercepts along-shelf transport pathways (Johnson et al, 2001;Michels et al, 2003). The Mississippi River margin possesses two of these characteristics (2 and 4), making it a candidate for large-scale OM export.…”

Section: Sediment and Om Transport From Large Riversmentioning

confidence: 99%

Where Carbon Goes When Water Flows: Carbon Cycling across the Aquatic Continuum

et al. 2017

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The purpose of this review is to highlight progress in unraveling carbon cycling dynamics across the continuum of landscapes, inland waters, coastal oceans, and the atmosphere. Earth systems are intimately interconnected, yet most biogeochemical studies focus on specific components in isolation. The movement of water drives the carbon cycle, and, as such, inland waters provide a critical intersection between terrestrial and marine biospheres. Inland, estuarine, and coastal waters are well studied in regions near centers of human population in the Northern hemisphere. However, many of the world's large river systems and their marine receiving waters remain poorly characterized, particularly in the tropics, which contribute to a disproportionately large fraction of the transformation of terrestrial organic matter to carbon dioxide, and the Arctic, where positive feedback mechanisms are likely to amplify global climate change. There are large gaps in current coverage of environmental observations along the aquatic continuum. For example, tidally-influenced reaches of major rivers and near-shore coastal regions around river plumes are often left out of carbon budgets due to a combination of methodological constraints and poor data coverage. We suggest that closing these gaps could potentially alter global estimates of CO 2 outgassing from surface waters to the atmosphere by several-fold. Finally, in order to identify and constrain/embrace uncertainties in global carbon budget estimations it is important that we further adopt statistical and modeling approaches that have become well-established in the fields of oceanography and paleoclimatology, for example.

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“…Recent studies have shown that voluminous amounts of sediment can be transported from the shelf through present-day canyons in areas where the sediment source is near the canyon head (i.e., a river discharging onto a narrow shelf) (e.g., Kineke et al, 2000). The GOL data support these results showing active sediment escape through a submarine canyon that is adjacent to a narrow shelf.…”

Section: Impact/applicationsmentioning

confidence: 74%

Short-Timescale Strata Formation on a Canyon-Dominated Margin: Assessing the Link Between Shelf and Slope Systems

Mullenbach¹

2004

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LONG-TERM GLOALSPrior to recent work, it was commonly thought that sediment did not escape to areas seaward of the shelf break during the present highstand of sea level because of sediment trapping in estuaries and on broad continental shelves. However, recent results (including those from the STRATAFORM Program) have revealed that a significant amount of sediment can accumulate on continental slopes and escape to the deep sea via submarine canyons (e.g., Mullenbach et al., 2004;Puig et al., 2003). These studies reveal the importance of off-shelf sediment exchange during present conditions; however, the factors that control sediment transfer across shelf breaks are not well understood, particularly near canyon heads. The long-term goal of this research is to assess how a bathymetrically complex shelf break (i.e., with many canyons) affects the link between shelf and slope sedimentary systems. OBJECTIVESThis research (as part of the EuroSTRATAFORM Program) focuses on understanding the link between the shelf and slope sediment dispersal systems on the Gulf of Lions (GOL) margin, an area with many submarine canyons. The seabed study aims to achieve the following objectives: determine the primary pathways of seaward sediment dispersal over the shelf and slope, estimate the timing of sediment delivery to the slope, delineate the deposition/accumulation patterns on the shelf and slope, and estimate the amount of sediment sequestered by the canyons. APPROACHPrevious research has suggested that the western GOL may be the primary outlet for sediment due to narrowing of the shelf and the general east-to-west circulation pattern. This project has focused on the western GOL, including the western shelf and Cap de Creus and Lacaze-Duthiers Canyons, where seaward escape is expected to be most intense (Fig. 1). Information on the spatial and temporal changes in seabed characteristics was collected (using shipboard coring techniques). Grain sizes, sedimentary structures, radioisotopic signatures and accumulation rates were monitored during different seasons to capture the timing of sediment delivery to the shelf and canyon heads. In addition, cores were collected across the western shelf and canyons to define the spatial patterns of sediment accumulation. Field and laboratory resources were pooled with C. Nittrouer to aid in the collection and analysis of cores.

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Sediment export from the Sepik River, Papua New Guinea: evidence for a divergent sediment plume

Cited by 164 publications

References 44 publications

Reply to Comment of Encinas et al. (2014) on: ‘Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, climatic and tectonic implications’ of Gutiérrez et al. (2013, Andean Geology 40 (1): 66-78).

Reply to Comment of Encinas et al. (2014) on: ‘Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, climatic and tectonic implications’ of Gutiérrez et al. (2013, Andean Geology 40 (1): 66-78).

Where Carbon Goes When Water Flows: Carbon Cycling across the Aquatic Continuum

Short-Timescale Strata Formation on a Canyon-Dominated Margin: Assessing the Link Between Shelf and Slope Systems

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