Preprints

Filtering by Subject: Sedimentology

Pleistocene shifts in Great Basin hydroclimate seasonality govern the formation of lithium-rich paleolake deposits

Tripti Bhattacharya, Peter Brennan, Daniel Enrique Ibarra, et al.

Published: 2024-04-11
Subjects: Earth Sciences, Hydrology, Oceanography and Atmospheric Sciences and Meteorology, Paleobiology, Sedimentology

Southwestern North America is currently experiencing a multidecadal megadrought, with severe consequences for water resources. However, significant uncertainty remains about how precipitation will change in the 21st century in this semi-arid region. Paleoclimatic records are essential for both contextualizing current change, and for helping constrain the sensitivity of regional hydroclimate to [...]

Using mixed siliciclastic-bioclastic sediments as a natural analogue for plastic-rich systems

Domenico Chiarella

Published: 2024-04-06
Subjects: Earth Sciences, Environmental Sciences, Geology, Sedimentology

Mixed siliciclastic-bioclastic sediments and systems represent an analogue to understanding the behaviour and impact of plastic sediments in natural environments. The integration of knowledge derived from different mixed systems can enhance our comprehension of depositional processes, bedform morphology, and plastic distribution as well as assess the potentiality of siliciclastic-bioclastic [...]

The role of salt diapirism in controlling the sedimentology and distribution of deep-water deposits, Pierce Field, East Central Graben, North Sea

Clara Abu, Christopher Aiden-Lee Jackson

Published: 2024-03-04
Subjects: Earth Sciences, Geology, Other Earth Sciences, Sedimentology, Tectonics and Structure

Passively rising diapirs control flank deformation (i.e., within 1 km of the salt-sediment interface) and resultant stratigraphic architecture of syn-kinematic units. Growth strata associated with deformation at the flanks of passive diapirs are known as halokinetic sequences. Very few studies have conducted an integrated analysis of composite halokinetic sequences, CHS (stacked halokinetic [...]

Early extensional salt tectonics controls deep-water sediment dispersal

Davide Oppo, Christopher Aiden-Lee Jackson, Vittorio Maselli

Published: 2024-02-21
Subjects: Earth Sciences, Geology, Sedimentology

The impact of seafloor deformation on sediment routing during the initial phases of extensional salt tectonics is largely unresolved despite influencing the volume of coarse-grained clastic material delivered to the deep sea. Using 3D seismic reflection data from the northern Levant Basin offshore Lebanon, we investigate the interplay between early extension-related salt deformation and [...]

WITHDRAWN: The potential of terrestrial and aquatic molluscs for the temporal analysis of Deckenschotter deposits and younger Quaternary sediments from the Swiss Plateau

Nigel Thew

Published: 2024-02-09
Subjects: Earth Sciences, Geology, Geomorphology, Paleobiology, Paleontology, Sedimentology, Stratigraphy

Facies models for rocky shorelines and their application to transgressed basement highs in the North Sea.

Josep Maria Puig Lopez, John Howell

Published: 2024-01-29
Subjects: Earth Sciences, Geology, Geomorphology, Sedimentology, Stratigraphy

Rocky shorelines form where basement highs are eroded and flooded during marine transgressive events. Despite the Mesozoic North Sea rift generated numerous platform margins and rotated fault blocks which acted as basement highs, rocky shoreline deposits have not been previously reported. In the rock record rocky shoreline deposits are usually represented by thin conglomerates overlying major [...]

River Floodplains, Organic Carbon, and Paleoclimate: How River Dynamics Impart Biases in the Biogeochemical Climate Record of Terrestrial Landscapes

Anjali M Fernandes, Michael T Hren, Virginia B. Smith, et al.

Published: 2024-01-29
Subjects: Earth Sciences, Geochemistry, Geomorphology, Hydrology, Physical Sciences and Mathematics, Sedimentology, Stratigraphy

River floodplains can be both sources and sinks for organic carbon. In the sedimentary record, geochemical signatures of terrestrial water availability record climate and ecology along river corridors in deep time. However, paleoenvironmental reconstructions are often confounded by the complex dynamics of organic carbon residence, entrainment, and deposition in a fluvial system. As alluvial [...]

The Rapa Nui Little Ice Age drought: evidence, potential causes and socioecological impact

Valentí Rull

Published: 2024-01-12
Subjects: Paleontology, Sedimentology, Terrestrial and Aquatic Ecology

A decade ago, an island-wide drought was proposed to have occurred on Rapa Nui (Easter Island) during the Little Ice Age (LIA). This climatic event was considered to be important for ecological and cultural transformations that occurred on the island during the 16th and 17th centuries. Independent multiproxy paleoecological and paleoclimatic evidence produced in the last years supports the [...]

PHOTOMOB: AUTOMATED GIS METHOD FOR ESTIMATION OF FRACTIONAL GRAIN DYNAMICS IN GRAVEL BED RIVERS. PART 1: GRAIN SIZE

Fanny Ville, Damià Vericat, Ramon J. Batalla, et al.

Published: 2023-12-07
Subjects: Earth Sciences, Environmental Monitoring, Geomorphology, Hydrology, Sedimentology, Water Resource Management

Particle entrainment intensity is spatially and temporally variable, making it a complex phenomenon to measure. This paper is the first of a pair, in which we present an automated image processing procedure (PhotoMOB) for monitoring the mobility/stability of gravel river beds. The method is based on local comparison of the shape of the grains identified at the same coordinates between successive [...]

PhotoMOB: Automated GIS method for estimation of fractional grain dynamics in gravel bed rivers. Part 2: Bed stability and fractional mobility

Fanny Ville, Damià Vericat, Ramon J. Batalla, et al.

Published: 2023-12-07
Subjects: Earth Sciences, Environmental Monitoring, Geomorphology, Hydrology, Sedimentology, Water Resource Management

Bed mobility and stability are spatially and temporally variable, making it a complex phenomenon to study. This paper is the second of a pair, in which we present an automated image processing procedure for monitoring the mobility/stability of gravel river beds. The method is based on local comparison of the shape of the grains identified at the same coordinates between successive photos to [...]

Downsystem Grain-Size Trends and Mass Balance of an Ancient Wave-Influenced Sediment Routing System: Middle Jurassic Brent Delta, Northern North Sea, Offshore UK and Norway

Ikenna Okwara, Gary J Hampson, Alexander C Whittaker, et al.

Published: 2023-11-14
Subjects: Earth Sciences, Geology, Physical Sciences and Mathematics, Sedimentology, Stratigraphy

We reconstruct upsystem-to-downsystem grain-size variations in the sediment routing systems of the data-rich Middle Jurassic Brent Group of the northern North Sea, using published stratigraphic, thickness, palaeogeographic, provenance and age constraints combined with representative core and wireline-log data. Facies associations provide a textural proxy for gravel, sand and mud grain-size [...]

How agriculture, droughts and diseases shaped the island environments of Remote Oceania over the last Millennium

Giorgia Camperio, Nemiah Ladd, Matiu Prebble, et al.

Published: 2023-11-11
Subjects: Paleontology, Sedimentology

Over the past millennium, the Pacific Islands have experienced significant transformations, caused by different waves of human settlement and climatic variability. However, the paucity of archeological records coupled with the complex climatic setting of the tropical Pacific hinders our understanding of past environmental and societal changes. In this study, we employ a multi-proxy approach on [...]

Wetter climate favouring early Lapita horticulture in Remote Oceania

Giorgia Camperio, Nemiah Ladd, Matiu Prebble, et al.

Published: 2023-11-10
Subjects: Paleontology, Sedimentology

The islands of Remote Oceania were among the last places on Earth colonised by humans. Lapita seafarers carrying with them an extensive root-tuber-tree crop complex and domestic animals, rapidly transformed nearly all of these previously unoccupied islands. However, the timing of initial Lapita settlements and the early introduction of horticulture remain a matter of debate as significant changes [...]

Changes in mesophotic carbonate-platform export across the end of the last glacial cycle (Saya de Malha Bank, western Indian Ocean)

Or M. Bialik, Christian Betzler, Juan Carlos Braga Alarcón, et al.

Published: 2023-11-07
Subjects: Biogeochemistry, Geochemistry, Natural Resources and Conservation, Other Earth Sciences, Other Environmental Sciences, Paleobiology, Sedimentology, Stratigraphy

The export of neritic material from the top of carbonate platforms is a key process in the construction of their slopes. However, our knowledge of the supply pattern of materials from platforms is dominantly based on platforms lying in the euphotic zone during the present sea-level highstand. This is a somewhat biased perspective as through geological time not all platforms were euphotic. The [...]

Transgression–regression cycles drive correlations in Ediacaran–Cambrian rock and fossil records

Daniel C Segessenman, Shanan E Peters

Published: 2023-11-07
Subjects: Earth Sciences, Geology, Paleontology, Physical Sciences and Mathematics, Sedimentology, Statistical Methodology, Statistics and Probability, Stratigraphy

Strata of the Ediacaran Period (635–538.8 Ma) yield the oldest known fossils of complex, macroscopic organisms in the geologic record. These “Ediacaran-type” macrofossils (known as the Ediacaran biota) first appear in mid-Ediacaran strata, experience an apparent decline through the terminal Ediacaran, and directly precede the Cambrian (538.8–485.4 Ma) radiation of animals. Existing hypotheses for [...]

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