Lateral variability of ichnological content in muddy contourites: Weak bottom currents affecting organisms’ behavior

Dorador, Javier; Rodrı́guez-Tovar, Francisco J.; Mena, Anxo; Francés, Guillermo

doi:10.1038/s41598-019-54246-3

Cited by 30 publications

(12 citation statements)

References 34 publications

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“…Zoophycos is most common in sediments deposited during glacial times and when the sedimentation rate was intermediate (5-20 cm ka −1 ) and primary production was high and seasonal. Zoophycos appears to represent a useful proxy to characterize high and seasonal organic matter deposition and primary productivity in Neogene hemipelagic deposits [17,94,95]. The greater presence of Zoophycos during glacial intervals in all cores confirms that these statements are also reasonable for Discovery Gap.…”

Section: Temporal Variation Of the Environmental Factors In Discovery Gapsupporting

confidence: 54%

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Landscape Mapping, Ichnological and Benthic Foraminifera Trends in a Deep-Water Gateway, Discovery Gap, NE Atlantic

et al. 2021

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Multidisciplinary studies have allowed us to describe the abiotic landscapes and, thus, reveal the ichnological and benthic foraminifera trends in a deep-water gateway. Mesoscale landscape mapping is presented based on the bathymetric position index, substrate types and near-bottom water temperature. Four sediment cores, retrieved from the entrance, centre and exit of the gap, were subject to computed tomography, ichnological and benthic foraminifera studies. A high diversity of abiotic landscapes in the relatively small area of Discovery Gap is detected and its landscape is characterized by 23 landscape types. The most heterogeneous abiotic factor is a topography that is associated with sediment patchiness and substrate variability. The ichnological and tomographical studies of the sediment cores demonstrate lateral and temporal differences in the macrobenthic tracemaker behaviour. The ichnofossils assemblage of the sediment core can be assigned to the Zoophycos ichnofacies with a higher presence of Zoophycos in the entrance site of the gap and during glacial intervals. Higher benthic foraminifera diversity and species richness during the Holocene are also registered in the southern part of the gap compared to the northern part. The spatial and temporal differences in macro-benthos behavior and benthic foraminifera distribution in the deep-water gateway are proposed to relate to the topographical variations of the Antarctic Bottom Water and its influence on the hydrodynamic regime, nutrient transport, etc.

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Section: Temporal Variation Of the Environmental Factors In Discovery Gapsupporting

confidence: 54%

“…However, the gateway environment is an underexplored area from the ichnological point of view. Although, the lateral variability of ichnological content under the influence of bottom currents is discussed, e.g., in [17].…”

Section: Introductionmentioning

confidence: 99%

Landscape Mapping, Ichnological and Benthic Foraminifera Trends in a Deep-Water Gateway, Discovery Gap, NE Atlantic

et al. 2021

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“…The proposed method was checked on 15 soft sediment cores from marine settings. Specifically, 13 of them were downloaded from the Virtual Core Library of samples drilled by D/V CHIKYU 13 (316-C0006F-12R-2, 322-C0012A-34R-1, 322-C0012A-34R-2, 333-C0011C-1H-1, 333-C0011C-1H-2, 333-C0011C-1H-5, 333-C0011C-2H-1, 333-C0011C-2H-2, 333-C0011D-3H-6, 333-C0011D-40X-6, 333-C0011D-41X-3, 333-C0011D-41X-4, 333-C0011D-49X-4) and two of them from gravity cores collected during ForSaGal 09 30 , 31 (FSG09-07, FSG09-17). Cores drilled by D/V CHIKYU were scanned immediately after core cutting using an X-ray CT scanner (LightSpeed Ultra 16, GE Yokogawa Medical Sys-tems, Ltd.) on the ship.…”

Section: Methodsmentioning

confidence: 99%

CroSSED sequence, a new tool for 3D processing in geosciences using the free software 3DSlicer

Dorador

Rodríguez‐Tovar

2020

Sci Data

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The scientific application of 3D imaging has evolved significantly over recent years. These techniques make it possible to study internal features by non-destructive analysis. Despite its potential, the development of 3D imaging in the Geosciences is behind other fields due to the high cost of commercial software and the scarce free alternatives. Most free software was designed for the Health Sciences, and the pre-settled workflows are not suited to geoscientific materials. Thus, an outstanding challenge in the Geosciences is to define workflows using free alternatives for Computed Tomography (CT) data processing, promoting data sharing, reproducibility, and the development of specific extensions. We present CroSSED, a processing sequence for 3D reconstructions of CT data, using 3DSlicer, a popular application in medical imaging. Its usefulness is exemplified in the study of burrows that have lowdensity contrast with respect to the host sediment. For geoscientists who have access to CT data and wish to reconstruct 3D structures, this method offers a wide range of possibilities and contributes to open-science and applied CT studies.

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“…Hydrodynamic conditions are a very signi cant limiting factor for trace makers, inducing variations in distribution and behaviour, hence in the preservation of trace fossils 19,29,42,43 . Typically, ichnoassemblages related to high energy conditions are characterised by vertical dwelling structures of infaunal suspension feeders and/or passive predators, forming low-diversity suites; ichnoassemblages related to low energy conditions are dominated by horizontal traces of deposit and detritus feeders, as well as higher diversity 19 .…”

Section: Ichnofacies In Seaways: Hydrodynamic Energy and The Incidencmentioning

confidence: 99%

Exploring Ichnofacies Distribution in Ancient Seaways: The Late Miocene Rifian Corridor as a Natural Laboratory

Weger¹,

Rodrı́guez-Tovar²,

Miguez‐Salas³

2020

Preprint

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Oceanic gateways have modulated ocean circulation and have influenced climatic variations throughout the Earth´s history. During the Late Miocene (7.8 - 7.35 Ma), the Atlantic Ocean and the Mediterranean Sea were connected through the Rifian Corridor (Morocco). This gateway is one of the few examples of deep ancient seaways with a semi-continuous sedimentary record. Deposits comprise turbidites intercalated between deep-sea fine grain sediments (i.e., hemipelagites and drift deposits), channelized sandstone contourite facies, and shallow marine sandstones. Herein an ichnological analysis was conducted in these upper Miocene sediments to improve characterisation of palaeoenvironmental conditions. In addition, ichnofacies were analysed to elucidate how bottom currents control ichnofacies distribution and can modified their attributes. Turbidite deposits are typified by vertical trace fossils (i.e., Ophiomorpha), conforming the Ophiomorpha rudis ichnosubfacies. Contouritic sandstones exhibit high density and low diverse trace fossil assemblage, with predominant Macaronichnus and Scolicia, resembling a proximal expression of Cruziana ichnofacies. Shallow marine environments are dominated by vertical trace fossils (e.g., Conichnus, Ophiomorpha and Skolithos), allowing an assignation to Skolithos ichnofacies. This study reveals energy to be a major controlling factor determining ichnofacies attributes and distribution in ancient deep seaways. Within these seaways, highly energetic conditions typical of shallower settings are present in deeper environments (i.e., slope), contributing to ichnodiversity impoverishment in ichnofacies.

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Lateral variability of ichnological content in muddy contourites: Weak bottom currents affecting organisms’ behavior

Cited by 30 publications

References 34 publications

Landscape Mapping, Ichnological and Benthic Foraminifera Trends in a Deep-Water Gateway, Discovery Gap, NE Atlantic

Landscape Mapping, Ichnological and Benthic Foraminifera Trends in a Deep-Water Gateway, Discovery Gap, NE Atlantic

CroSSED sequence, a new tool for 3D processing in geosciences using the free software 3DSlicer

Exploring Ichnofacies Distribution in Ancient Seaways: The Late Miocene Rifian Corridor as a Natural Laboratory

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