Mud depocenters on continental shelves—appearance, initiation times, and growth dynamics

Hanebuth, Till J J; Lantzsch, Hendrik; Nizou, Jean

doi:10.1007/s00367-015-0422-6

Cited by 87 publications

(58 citation statements)

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“…Distribution of deltas and estuaries (from Tessler et al 2015), major mud depocentres (from Hanebuth et al 2015) and areas where neobiota amenable to fossilization have recognizably altered coastal ecosystems (from: Major pathways and origins of invasive species infestations in the marine environment In UNEP/GRID-Arendal Maps and Graphics Library http://www.international-Mud deposition occurs on the continental shelves in front of major estuarine and deltaic areas (pro-deltas) around the world(Figure 8). They can also form subaqueous deltas disconnected from the source delta, or as scattered mud patches and widespread mud blankets, with a moderate sedimentation rate of 1-5 mm yr -1(Hanebuth et al 2015). They represent well-resolved palaeoenvironmental accumulations, commonly initiated during early flooding of continental shelves following deglaciation ~14 ky ago(Hanebuth et al 2015).…”

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“…They can also form subaqueous deltas disconnected from the source delta, or as scattered mud patches and widespread mud blankets, with a moderate sedimentation rate of 1-5 mm yr -1(Hanebuth et al 2015). They represent well-resolved palaeoenvironmental accumulations, commonly initiated during early flooding of continental shelves following deglaciation ~14 ky ago(Hanebuth et al 2015). One example now forming a sink of anthropogenic pollution, including heavy metals and hydrocarbons, lies off the coast of São Paolo State, SE Brazil(Mahiques et al 2016).…”

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Global Boundary Stratotype Section and Point (GSSP) for the Anthropocene Series: Where and how to look for potential candidates

Waters

Zalasiewicz

Summerhayes

et al. 2018

Earth-Science Reviews

185

132

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The Anthropocene as a potential new unit of the International Chronostratigraphic Chart (which serves as the basis of the Geological Time Scale) is assessed in terms of the stratigraphic markers and approximate boundary levels available to define the base of the unit. The task of assessing and selecting potential Global Boundary Stratotype Section and Point (GSSP) candidate sections, a required part of the process in seeking formalisation of the term, is now being actively pursued. Here, we review the suitability of different stratified palaeoenvironmental settings and facies as potential hosts for a candidate GSSP and auxiliary sections, and the relevant stratigraphical markers for correlation. Published examples are evaluated for their strengths and weaknesses in this respect. A marked upturn in abundance of radioisotopes of 239 Pu or 14 C, approximately in 1952 and 1954 CE respectively, broadly coincident with a downturn in δ 13 C values, is applicable across most environments. Principal palaeoenvironments examined include: settings associated with accumulations of anthropogenic material, marine anoxic basins, coral reefs, estuaries and deltas, lakes at various latitudes, peat bogs, snow/ice layers, speleothems and trees.Together, many of these geographically diverse palaeoenvironments offer annual/subannual laminae that can be counted and independently dated radiometrically (e.g. by 210 Pb).Examples of possible sections offer the possibility of correlation with annual/seasonal resolution. From among such examples, a small number of potentially representative sites require the acquisition of more systematic and comprehensive datasets, with correlation established between sections, to allow selection of a candidate GSSP and auxiliary stratotypes. The assessments in this paper will help find the optimal locations for these sections.

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confidence: 99%

Global Boundary Stratotype Section and Point (GSSP) for the Anthropocene Series: Where and how to look for potential candidates

Waters

Zalasiewicz

Summerhayes

et al. 2018

Earth-Science Reviews

185

132

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“…In summary, the shape of the GMD is defined by the interaction of waves, currents, thermohaline front, and advective buoyant plumes, as happens in other mud belts (Hanebuth et al, ). Waves, in a long‐term scale, have a primary role in the GMD shoreward boundary.…”

Section: Discussionmentioning

confidence: 99%

Bottom Boundary Layer and Particle Dynamics in an Upwelling Affected Continental Margin (NW Iberia)

et al. 2019

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The dynamics of the bottom boundary layer and their effects on the development of nepheloid layers (NLs) on a high-energy and upwelling-affected margin, the NW Iberian continental shelf, were studied by means of ADP currents, wave time series, and across-shelf hydrographic surveys covering an entire annual cycle. The bottom boundary layer hydrodynamics showed that high levels of bottom shear stress over the inner shelf occurred mainly during downwelling seasons, when there was a coupling between storm waves and intense currents. This wave-current coupling promotes strong resuspension events that favored the generation of bottom NLs (BNLs). BNLs were well developed on the inner continental shelf inshore of a thermohaline front generated by the interaction of the Iberian Poleward Current and the West Iberian Buoyant Plume. The existence of this front limited the extent of offshore export of resuspended particles during the downwelling season. In contrast, during the upwelling season, only thin BNLs were developed, and surface NLs, principally composed by biogenic particulate material, were advected offshore in the Ekman layer, often as part of the development of upwelling filaments. Our study confirmed that wave orbital velocity under stormy conditions, in combination with the hydrography, could explain the shoreward boundary of the Galician mud depocenter.Plain Language Summary This manuscript mainly focuses on hydrodynamics of the bottom boundary layer and the effect of wave-current bottom shear stress on the development and modulation of nepheloid layers on the NW Iberia continental shelf during more than 1 year. During this period, we analyze the role of hydrographic seasonality of this coastal upwelling system in the behavior of nepheloid layers and the possible offshore export pathways of particulate matter to the adjacent ocean. In addition, wave climate over the continental shelf was analyzed together with this hydrographic context in order to explain the surface sediment distribution.

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“…Finally, based on an in-depth overview of current knowledge on key mud depocenters (MDCs) worldwide, Hanebuth et al (2015) identify major MDCs controlled by sediment supply, seafloor morphology, and hydrodynamic energy. They define eight different types of MDCs: prodeltas, subaqueous deltas, mud patches and blankets, mud belts, shallow-water contourite drifts, and mud entrapments and wedges.…”

Section: Selected Contributionsmentioning

confidence: 99%

Quaternary mud deposits on the Korean shelf—processes, facies, stratigraphy: an introduction and future challenges

Chang

Yoo

2015

Geo-Mar Lett

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On the Korean and adjacent Chinese epicontinental shelves of the Yellow Sea, a variety of mud deposits occur that all formed during the late Quaternary. The available evidence suggests that they were generated by different processes in different water depths and at different times. Over the last three decades, numerous studies have revealed the largescale features and stratigraphic evolution histories of some of these mud deposits, but the nature of the deposits as such and, in particular,

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Mud depocenters on continental shelves—appearance, initiation times, and growth dynamics

Cited by 87 publications

References 147 publications

Global Boundary Stratotype Section and Point (GSSP) for the Anthropocene Series: Where and how to look for potential candidates

Global Boundary Stratotype Section and Point (GSSP) for the Anthropocene Series: Where and how to look for potential candidates

Bottom Boundary Layer and Particle Dynamics in an Upwelling Affected Continental Margin (NW Iberia)

Quaternary mud deposits on the Korean shelf—processes, facies, stratigraphy: an introduction and future challenges

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