Preprints

Filtering by Subject: Sedimentology

An interconnected palaeo-subglacial lake system in the central Barents Sea

Mariana Esteves, Denise Christina Rüther, Monica C.W. Winsborrow, et al.

Published: 2022-12-03
Subjects: Earth Sciences, Geology, Geomorphology, Glaciology, Sedimentology

Drainage of meltwater beneath an ice sheet influences ice-flow dynamics. To better predict ice sheet behaviour, it is crucial to understand subglacial hydrological processes. Subglacial lakes are important components of the subglacial hydrological system, with many observed and predicted at the beds of contemporary and palaeo-ice sheets. The technical and logistical challenges of studying [...]

The unknown fate of macroplastic in mountain rivers

Maciej Liro, Tim van Emmerik, Anna Zielonka, et al.

Published: 2022-11-09
Subjects: Earth Sciences, Environmental Indicators and Impact Assessment, Environmental Monitoring, Geology, Geomorphology, Hydrology, Life Sciences, Natural Resources and Conservation, Sedimentology, Stratigraphy, Sustainability, Terrestrial and Aquatic Ecology, Water Resource Management

Mountain rivers are typically seen as relatively pristine ecosystems, supporting numerous goods (e.g., water resources) for human populations living not only in the mountain regions but also downstream from them. Recent evidence suggests, however, that mountain river valleys in populated areas can be substantially polluted by macroplastic (plastic item > 5 mm). It is, however, unknown how [...]

Phanerozoic cooling events in the continental rims of the Central Atlantic Ocean.

Rémi Charton, Rémi Leprêtre

Published: 2022-10-28
Subjects: Geology, Geomorphology, Sedimentology, Tectonics and Structure

In this review, we have digitized and georeferenced over 7000 Low-Temperature Thermochronology (LTT) data points and 750 Time-Temperature Modelling (TTM) results from 252 published works. The study area includes the continental crusts adjacent to the rifted margins (~Late Triassic to Early Jurassic) of the Central Atlantic Ocean and its direct neighbours. Our main intention is to map out the [...]

GANSim-surrogate: An integrated framework for conditional geomodelling and uncertainty analysis

Suihong Song, Dongxiao Zhang, Tapan Mukerji, et al.

Published: 2022-10-24
Subjects: Computational Engineering, Earth Sciences, Environmental Engineering, Fluid Dynamics, Geology, Geophysics and Seismology, Hydrology, Sedimentology

We propose a deep-learning framework (GANSim-surrogate) for conditioning subsurface geomodel realizations to static data and dynamic flow data. The static data includes well facies data, interpreted facies probability maps, and non-spatial global features, while dynamic data can include well data such as pressures and flow rates. The framework consists of a Convolutional Neural Network (CNN) [...]

Sedimentologika: a community-driven diamond open access journal in sedimentology

Camille Thomas, Aurelia Marie-Luce Privat, Romain Vaucher, et al.

Published: 2022-10-23
Subjects: Earth Sciences, Library and Information Science, Sedimentology

Sedimentologika is a community-driven Diamond Open Access (DOA) scientific journal for the publication of work in the broad area of sedimentology and stratigraphy. The journal aims to provide the academic community and society a platform guaranteeing permanent free publication and free access to peer-reviewed scientific studies focusing on all types of sedimentary processes, deposits, and [...]

The impact of Holocene deglaciation and glacial dynamics on the landscapes and geomorphology of Potter Peninsula, King George Island (Isla 25 Mayo), NW Antarctic Peninsula

Pablo Heredia Barión, Jorge A Strelin, Stephen J Roberts, et al.

Published: 2022-10-19
Subjects: Earth Sciences, Geology, Geomorphology, Glaciology, Physical Sciences and Mathematics, Sedimentology

The timing and impact of deglaciation and Holocene readvances on many ice-free terrestrial continental margins of the Antarctic Peninsula have been long-studied but remain debated. Potter Peninsula on King George Island (Isla 25 de Mayo), South Shetland Islands (SSI), NW Antarctic Peninsula has a detailed assemblage of glacial landforms, geomorphological features and stratigraphic exposures for [...]

Geochemical mapping by unmixing alluvial sediments: An example from northern Australia

Alex George Lipp, Patrice de Caritat, Gareth G Roberts

Published: 2022-10-01
Subjects: Earth Sciences, Environmental Monitoring, Environmental Sciences, Geochemistry, Geomorphology, Natural Resource Economics, Sedimentology, Soil Science, Water Resource Management

Alluvial sediments have long been used in geochemical surveys as their compositions are assumed to be representative of areas upstream. Overbank and floodplain sediments, in particular, are increasingly used for regional to continental-scale geochemical mapping. However, during downstream transport, sediments from heterogeneous source regions are carried away from their source regions and mixed. [...]

North Atlantic Drift Sediments Constrain Eocene Tidal Dissipation and the Evolution of the Earth-Moon System

David De Vleeschouwer, Donald Penman, Simon D'haenens, et al.

Published: 2022-09-15
Subjects: Geochemistry, Geology, Sedimentology, Stratigraphy

Cyclostratigraphy and astrochronology are now at the forefront of geologic timekeeping. While this technique heavily relies on the accuracy of astronomical calculations, solar system chaos limits how far back astronomical calculations can be performed with confidence. High-resolution paleoclimate records with Milankovitch imprints now allow reversing the traditional cyclostratigraphic approach: [...]

Down-delta hydraulic geometry and its application to the rock record

Octria Adi Prasojo, Trevor B Hoey, Richard David Williams, et al.

Published: 2022-08-31
Subjects: Earth Sciences, Geology, Geomorphology, Physical Sciences and Mathematics, Sedimentology, Stratigraphy

Paleodischarge estimation is largely undertaken within fluvial settings, and there are limited paleodischarge estimates specifically from delta deposits, despite their significance globally. Making water paleodischarge estimates for deltas using catchment-based approaches developed using data from fluvial settings requires estimation of parameters from the rock record (e.g. paleotemperature, [...]

Practical sampling criteria for using delta channel width to estimate paleodischarge in the rock record

Octria Adi Prasojo, Anna van Yperen, Trevor B Hoey, et al.

Published: 2022-08-31
Subjects: Earth Sciences, Geology, Geomorphology, Physical Sciences and Mathematics, Sedimentology, Stratigraphy

Quantifying paleodischarge from geological field observations have been for decades, and remains, a key research challenge. Several paleodischarge scaling relationships have been developed for fluvial environments, such as BQART, Fulcrum and regional hydraulic geometry or for river deltas by precluding the role of wave and tide. In deltas where marine (wave, tide) energy causes bidirectional [...]

Automated stratigraphic correlation and model building using chronostratigraphic principles

Zoltan Sylvester

Published: 2022-08-07
Subjects: Sedimentology, Software Engineering, Stratigraphy

Stratigraphic correlation of geophysical well logs is one of the most important - and most time-consuming - tasks that applied geoscientists perform on a daily basis. Using the dynamic time warping (DTW) algorithm, automated correlation of two wells is a fairly simple task; DTW can also be used to correlate a large number of wells along a single path. However, errors accumulate along a path and [...]

DEFORMATION OF A SHALE-DOMINATED DELTA: TARAKAN BASIN, OFFSHORE INDONESIA

Aurio Erdi, Christopher Aiden-Lee Jackson, Juan I. Soto

Published: 2022-08-04
Subjects: Geology, Sedimentology, Tectonics and Structure

Deformation on shale-rich continental margins is commonly associated with thin-skinned extension above mobile shales. Normal faulting and shale mobilization are widespread on such margins, being associated with and controlled by progradation and gravitational failure of deltaic sedimentary wedges. However, due to limitations in our ability to seismically imaging these mobile shales, our [...]

Mud redeposition during river incision as a factor affecting authigenic 10Be/9Be dating: Early Pleistocene large mammal fossil-bearing site Nová Vieska, eastern Danube Basin

Michal Šujan, Régis Braucher, Andrej Chyba, et al.

Published: 2022-07-29
Subjects: Earth Sciences, Geology, Geomorphology, Sedimentology, Stratigraphy

This study examines the suitability of the authigenic 10Be/9Be dating method to the dating of the deposits of an incising river, taking as an example the Nová Vieska river terrace, which accumulated during the neotectonic inversion of the Danube Basin (western Slovakia). The succession was formed by a wandering river with minor preservation of proximal floodplain muds. The frequent occurrence of [...]

Water discharge variations control fluvial stratigraphic architecture in the middle Eocene Escanilla formation, Spain

Nikhil Sharma, Alexander C Whittaker, Stephen E. Watkins, et al.

Published: 2022-07-27
Subjects: Earth Sciences, Geology, Geomorphology, Hydrology, Sedimentology, Stratigraphy

Ancient fluvial deposits typically display repetitive changes in their depositional architecture such as alternating intervals of laterally-stacked, high-amalgamation (HA) channels, and floodplain-dominated intervals with vertically-stacked, low-amalgamation (LA) channels. Such patterns are usually ascribed to slow and high rates of base-level rise respectively, but “upstream” factors such as [...]

Evaluation of preservation protocols for oxygen-sensitive minerals within laminated aquatic sediments

Gabrielle Ledesma, Raisa Islam, Elizabeth Swanner Smith

Published: 2022-07-25
Subjects: Biogeochemistry, Environmental Sciences, Geochemistry, Sedimentology

Laminated sediments can record seasonal changes in sedimentation of material from anoxic waters, including minerals of the redox-sensitive elements Fe, Mn, and S that form under varying oxygen levels, mineral saturation conditions, and from microbial metabolism. However, preserving both the oxygen-sensitive minerals for identification is challenging when preservation of the spatial arrangement of [...]

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