Preprints

Filtering by Subject: Sedimentology

A re-examination of the mechanism of whiting events: A new role for diatoms in Fayetteville Green Lake (New York, USA)

Chloe Stanton, Julie Cosmidis, Lee Kump

Published: 2021-05-08
Subjects: Biogeochemistry, Environmental Microbiology and Microbial Ecology Life Sciences, Geochemistry, Life Sciences, Sedimentology

Whiting events – the episodic precipitation of fine-grained suspended calcium cabonates in the water column – have been documented across a variety of marine and lacustrine environments. Whitings likely are a major source of carbonate muds, a constituent of limestones, and important archives for geochemical proxies of Earth history. While several biological and physical mechanisms have been [...]

Fracture distribution in a folded fluvial succession: the Puig-reig anticline (South-eastern Pyrenees)

Xiaolong Sun, Enrique Gomez-Rivas, Juan Alcalde, Juan Diego Martín-Martín, Cunfei Ma, Daniel Muñoz-López, David Cruset, Irene Cantarero, Albert Griera, Anna Travé

Published: 2021-05-07
Subjects: Geology, Sedimentology, Stratigraphy, Tectonics and Structure

Sedimentary rocks of foreland fold-and-thrust belts typically undergo intensive fracturing as fold grows. The resulting fracture networks can present significant variations depending on the distribution of sedimentary facies and the complex structural characteristics of fold-and-thrust belts. The Puig-reig anticline, located in the south-eastern Pyrenees, mainly exposes proximal fluvial deposits [...]

Syn- to post-rift alluvial basin fill: seismic stratigraphic analysis of Permian-Triassic deposition in the Horda Platform, Norway

Camilla Würtzen, Johnathon Lee Osmond, Jan Inge Faleide, Johan Petter Nystuen, Ingrid Margareta Anell, Ivar Midtkandal

Published: 2021-05-02
Subjects: Geology, Geomorphology, Sedimentology, Stratigraphy, Tectonics and Structure

Discrepancies in models of continental rift-basin dynamics and stratigraphic response calls on further investigation on the subject. Geometric- and lithological trends between stages of faulting is studied in the Permian- Triassic continental rift succession in the Horda Platform. The Horda Platform occupies the northeastern margin of the North Sea aulacogen where Late Permian-Early Triassic [...]

Go with the flow: the role of gateway and straits on plastic distribution

Domenico Chiarella, Francisco Javier Hernández-Molina

Published: 2021-04-20
Subjects: Geology, Sedimentology

Plastic pollution is widespread throughout the marine environments representing a risk for ecosystems and human health when plastic enters the food chain. Understanding factors and processes controlling plastic distribution and accumulation is crucial to identify plastic hotspots. Gateways and straits can play an important role on transferring plastic debris at superficial and sea bottom level [...]

Integrated multi-proxy source-to-sink analysis of the Lower Cretaceous of the Essaouira-Agadir Basin.

Emmanuel Roquette, James Lovell Kennedy, Leonardo Muniz Pichel, Stefan Schröder, Remi J.G. Charton, Ian Millar, Jonathan Redfern

Published: 2021-04-20
Subjects: Geology, Sedimentology

This study investigates the Provenance of the Barremian-Aptian fluvial clastics exposed in the Essaouira-Agadir Basin which bears an important potential in terms of offshore feeding of reservoir sands. Thin section petrography and SEM, heavy minerals analysis, and detrital zircon dating were conducted and integrated with a large dataset of published low-temperature thermochronology studies to [...]

Microstructural differences between naturally-deposited and laboratory beach sands

Amy Ferrick, Vashan Wright, Michael Manga, Nicholas Sitar

Published: 2021-04-14
Subjects: Civil and Environmental Engineering, Civil Engineering, Earth Sciences, Engineering, Geophysics and Seismology, Geotechnical Engineering, Physical Sciences and Mathematics, Sedimentology

The orientation of and contacts between grains of sand reflect the processes that deposit the sands. Grain orientation and contact geometry also influence mechanical properties. Quantifying and understanding sand microstructure thus provide an opportunity to understand depositional processes better and connect microstructure and macroscopic properties. We compare naturally-deposited beach sands [...]

The concavity of modern submarine canyon longitudinal profiles

Euan Soutter, Ian Kane, David Mark Hodgson, Stephen S. Flint

Published: 2021-04-07
Subjects: Earth Sciences, Geology, Geomorphology, Physical Sciences and Mathematics, Sedimentology

Submarine canyons incise into continental shelves and slopes, and are important conduits for the transport of sediment, nutrients, organic carbon and pollutants from continents to oceans. Submarine canyons bear morphological similarities to subaerial valleys, such as their longitudinal (long) profiles. Long profiles record the interaction between erosion and uplift, making their shape, or [...]

Channel, dune and sand sheet architectures of strait-adjacent deltas, Rifian Corridor, Morocco

Daan Beelen, Lesli Joy Wood, Mohammed Najib Zaghloul, Sebastian Cardona, Michiel Arts

Published: 2021-03-26
Subjects: Geology, Sedimentology, Stratigraphy

Sea straits are elongate basin geometries that are common in the sedimentary record and play a key role in oceanography and climate. Due to the intricate confluence of marine processes and the typically complex structural settings of sea straits, many sedimentary and stratigraphic characteristics of these depositional systems are not fully understood. To better resolve these, we study excellent [...]

Correlative Microscopy: a tool for understanding soil weathering in modern analogues of early terrestrial biospheres

Ria Mitchell, Peter Davies, Paul Kenrick, Tobias Volkenandt, Cameron Pleydell-Pearce, Richard Johnston

Published: 2021-03-18
Subjects: Biogeochemistry, Geology, Paleobiology, Plant Sciences, Research Methods in Life Sciences, Sedimentology, Soil Science

Correlative imaging provides a method of investigating complex systems by combining analytical (chemistry) and imaging (tomography) information across dimensions (2D-3D) and scales (centimetres-nanometres). We studied weathering processes in a modern cryptogamic ground cover (CGC) from Iceland, containing early colonizing, and evolutionary ancient, communities of mosses, lichens, fungi, and [...]

Polygenetic mélange in the retrowedge foredeep of an active arc-continent collision, Coastal Range of eastern Taiwan (accepted manuscript)

Larry Syu-Heng Lai, Rebecca J. Dorsey, Chorng-Shern Horng, Wen-Rong Chi, Kai-Shuan Shea, Jiun-Yee Yen

Published: 2021-03-17
Subjects: Earth Sciences, Geology, Sedimentology, Stratigraphy, Tectonics and Structure

The Plio-Pleistocene Lichi Mélange in the Coastal Range of eastern Taiwan offers an excellent opportunity to study processes of mélange development at the continent-ocean interface of an active arc-continent collision. This paper presents new results of detailed geologic mapping, lithofacies analysis, magneto-biostratigraphy, paleocurrent, and paleoslope analyses in the southern Coastal Range to [...]

Silurian carbonate high-energy deposits of potential tsunami origin: distinguishing lateral redeposition and time averaging using carbon isotope chemostratigraphy

Emilia Jarochowska, Axel Munnecke

Published: 2021-03-17
Subjects: Earth Sciences, Geochemistry, Geology, Sedimentology, Stratigraphy

Stable carbon isotope curves are used as a precise stratigraphic tool in the Paleozoic, even though they are commonly based on shallow-water carbonate record, characterized by low stratigraphic completeness. Identification of episodes of large-scale redeposition and erosion may improve δ13Ccarb-based correlations. Here, a series of at least three episodes of high-energy onshore redeposition are [...]

The Sidi Ifni transect across the rifted margin of Morocco (Central Atlantic): Vertical movements constrained by low-temperature thermochronology

Remi J.G. Charton, Giovanni Bertotti, Angel Arantegui, Luc Bulot

Published: 2021-03-17
Subjects: Earth Sciences, Geology, Geomorphology, Paleontology, Sedimentology, Stratigraphy, Tectonics and Structure

The occurrence of km-scale exhumations during syn- and post-rift stages has been documented along Atlantic continental margins, which are also characterised by basins undergoing substantial subsidence. The relationship between the exhuming and subsiding domains is poorly understood. In this study, we reconstruct the evolution of a 50 km long transect across the Moroccan rifted margin from the [...]

The Ca and Mg isotope record of the Cryogenian Trezona carbon isotope excursion

Anne-Sofie Crüger Ahm, Christian J Bjerrum, Paul F Hoffman, Francis A Macdonald, Adam C Maloof, Catherine V Rose, Justin V. Strauss, John A Higgins

Published: 2021-03-11
Subjects: Earth Sciences, Geochemistry, Geology, Sedimentology, Stratigraphy

The Trezona carbon isotope excursion is recorded on five different continents in platform carbonates deposited prior to the end-Cryogenian Marinoan glaciation (>635 Ma) and represents a change in carbon isotope values of 16-18 per mill. Based on the spatial and temporal reproducibility, the excursion previously has been interpreted as tracking the carbon isotopic composition of dissolved [...]

An uncertainty-focused database approach to extract spatiotemporal trends from qualitative and discontinuous lake-status histories

Gijs De Cort, Manuel Chevalier, Sallie L. Burrough, Christine Y. Chen, Sandy P. Harrison

Published: 2021-03-01
Subjects: Climate, Earth Sciences, Geology, Geomorphology, Hydrology, Longitudinal Data Analysis and Time Series, Other Earth Sciences, Sedimentology, Statistical Methodology, Stratigraphy

Changes in lake status are often interpreted as palaeoclimate indicators due to their dependence on precipitation and evaporation. The Global Lake Status Database (GLSDB) has since long provided a standardised synopsis of qualitative lake status over the last 30,000 14C years. Potential sources of uncertainty however are not recorded in the GLSDB. Here we present an updated and improved [...]

INCORPORATING INFORMATION ON VARYING SEDIMENTATION RATES INTO PALEONTOLOGICAL ANALYSES

Niklas Hohmann

Published: 2021-02-26
Subjects: Earth Sciences, Geology, Paleobiology, Paleontology, Sedimentology, Stratigraphy

Stratigraphic changes in the clustering of first or last taxon occurrences are a joint expression of evolutionary, ecological, taphonomic, and sedimentological processes. Sedimentation rates control the degree of sedimentary dilution and condensation and thus alter the time contained in a given thickness of sediment. However, it remains poorly explored quantitatively how distinct the [...]

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