Preprints

Filtering by Subject: Sedimentology

A very unconventional hydrocarbon play: the Mesoproterozoic Velkerri Formation of Northern Australia

Grant Cox, Alan S. Collins, Amber J.M. Jarrett, et al.

Published: 2022-05-16
Subjects: Geochemistry, Geology, Sedimentology, Stratigraphy, Tectonics and Structure

The ca. 1.5–1.3 Ga Roper Group of the greater McArthur Basin is a component of one of the most extensive Precambrian hydrocarbon-bearing basins preserved in the geological record, recently assessed as containing 429 million barrels of oil and eight trillion cubic feet of gas (in place). It was deposited in an intra-cratonic sea, referred to here as the McArthur-Yanliao Gulf. The Velkerri [...]

The CREp 36Cl exposure age calculator: development version “dev”

Irene Schimmelpfennig, Pierre-Henri BLARD, Jim Tesson, et al.

Published: 2022-05-04
Subjects: Geochemistry, Geology, Geomorphology, Glaciology, Sedimentology, Tectonics and Structure, Volcanology

Chlorine-36 (36Cl) is currently the only in situ cosmogenic nuclide applicable in carbonates, Ca- and K-rich feldspars and aphyric silicate rocks. Because the production reactions of 36Cl are more numerous and complex than those of other cosmogenic nuclides (e.g. 10Be, 3He), comprehensive and user-friendly calculators are essential for routine application of 36Cl to Earth surface research [...]

Automated detection of microfossil fish teeth from slide images using combined deep learning models

Kazuhide Mimura, Shugo Minabe, Kentaro Nakamura, et al.

Published: 2022-04-20
Subjects: Computational Engineering, Sedimentology

Microfossil fish teeth, known as ichthyoliths, provide a key constraint on the depositional age and environment of deep-sea sediments, especially pelagic clays where siliceous and calcareous microfossils are rarely observed. However, traditional methods for the observation of ichthyoliths require considerable time and manual labor, which can hinder their wider application. In this study, we [...]

Rivers of the Variscan Foreland: fluvial morphodynamics in the Pennant Formation of South Wales, UK

James Wood, Jonah S McLeod, Sinead J Lyster, et al.

Published: 2022-04-07
Subjects: Earth Sciences, Sedimentology

The morphodynamics of ancient rivers can be reconstructed from fluvial stratigraphy using quantitative techniques to provide detailed insights into the driving forces behind the sedimentary systems. This work explores how these drivers can be evaluated from Paleozoic stratigraphy. Field measurements are taken in fluvial sediments from the Westphalian (Bolsovian and Asturian; 315.2–308 Ma) Pennant [...]

Late Glacial and Holocene Palaeolake History of the Última Esperanza Region of Southern Patagonia

Stephen J Roberts, Robert D McCulloch, Joseph F Emmings, et al.

Published: 2022-03-29
Subjects: Earth Sciences, Geochemistry, Geology, Geomorphology, Glaciology, Hydrology, Paleobiology, Physical Sciences and Mathematics, Sedimentology, Stratigraphy, Volcanology

We undertook multiproxy analyses on two sediment cores from Lago Pato, a small lake basin at 51°S topographically separated from Lago del Toro in Torres del Paine (TdP), to provide insights into glacier dynamics and lake level change in the TdP and Última Esperanza region over the last ~30,000 cal a BP (30 ka). Lago Pato is situated in a region overridden by the Southern Patagonian Icefield [...]

Coastal River Response to Transgression: A New Look at the Trinity Incised Valley Using Multi-Resolution Seismic Imaging

John Swartz, Patricia Standring, JOHN A GOFF, et al.

Published: 2022-03-29
Subjects: Earth Sciences, Geology, Geomorphology, Geophysics and Seismology, Sedimentology

Modern lowland river systems show transitions in flow characteristics near coastlines that lead to systematic changes in sediment deposition and stratigraphic architecture. Sensitivity of fluvial morphodynamics to base-level has important implications for the prediction and interpretation of fluvial stratigraphy, particularly in deposits formed during periods of relative sea-level rise such as [...]

Detrital zircon record of the Sturtian glaciation: Adelaide Superbasin

Jarred Cain Lloyd, Wolfgang V Preiss, Alan S. Collins, et al.

Published: 2022-03-24
Subjects: Earth Sciences, Geochemistry, Geology, Sedimentology, Stratigraphy

The glaciogenic nature of the Yudnamutana Subgroup was first recognised over a century ago, and their global significance was recognised shortly after, eventually culminating with the pan global Sturtian glaciation and Snowball Earth theory. Much debate on the origin and timing of these rocks, locally and globally, has ensued in the years since. A significant corpus of research on the lithology, [...]

Late Tonian development and provenance of the Adelaide Superbasin

Jarred Cain Lloyd, Alan S. Collins, Morgan L. Blades, et al.

Published: 2022-03-22
Subjects: Earth Sciences, Geochemistry, Geology, Sedimentology, Stratigraphy, Tectonics and Structure

The late Tonian sequences of the Adelaide Superbasin were witness to the birth of the proto-Pacific Ocean during the breakup of Rodinia. Understanding the sedimentology and provenance of these rocks from across the basin is key to understanding both their deposition over ~70 million years, the local palaeogeography, and leads to a better understanding of the early development of the proto-Pacific [...]

Paleocene to Miocene southern Tethyan carbonate factories of the Southwestern and Western Central Asia

Giovanni Coletti, Lucrezi Commissario, Luca Mariani, et al.

Published: 2022-03-11
Subjects: Geology, Paleobiology, Paleontology, Sedimentology

One hundred and forty-four sections of shallow-water carbonates, deposited between the Paleocene and the Miocene, from the Levant to the Himalaya, have been investigated to analyze the distribution of carbonate facies and carbonate producing organisms. Large benthic foraminifera resulted the volumetrically most important group of carbonate producers during the whole period, with a peak in [...]

Inverting passive margin stratigraphy for marine sediment transport dynamics over geologic time

Charles Merritt Shobe, Jean Braun, XIAOPING YUAN, et al.

Published: 2022-03-09
Subjects: Geology, Geomorphology, Sedimentology, Stratigraphy

Passive margin stratigraphy contains time-integrated records of landscapes that have long since vanished. Quantitatively reading the stratigraphic record using coupled landscape evolution and stratigraphic forward models (SFMs) is a promising approach to extracting information about landscape history. However, the most commonly used SFM, which is based on an approximation of local, linear [...]

Freshwater Suspended Particulate Matter – Key Components and Processes in Floc Formation and Dynamics.

Helene Walch, Frank von der Kammer, Thilo Hofmann

Published: 2022-02-18
Subjects: Biogeochemistry, Environmental Chemistry, Environmental Microbiology and Microbial Ecology Life Sciences, Environmental Sciences, Fresh Water Studies, Geochemistry, Hydrology, Sedimentology

Freshwater suspended particulate matter (SPM) plays an important role in many biogeochemical cycles and serves multiple ecosystem functions. Most SPM is present as complex floc-like aggregate structures composed of various minerals and organic matter from the molecular to the organism level. Flocs provide habitat for microbes and feed for larger organisms. They constitute microbial bioreactors, [...]

Early evolution of the Adelaide Superbasin

Jarred Cain Lloyd, Alan S. Collins, Morgan L. Blades, et al.

Published: 2022-02-17
Subjects: Earth Sciences, Geochemistry, Geology, Sedimentology, Stratigraphy, Tectonics and Structure

Continental rifts have a significant role in supercontinent breakup, and the development of sedimentary basins. The Australian Adelaide Superbasin is one of the largest and best-preserved rift systems that initiated during the breakup of Rodinia, yet substantial challenges still hinder our understanding of its early evolution and place within the Rodinian supercontinent. In the past decade, our [...]

A one-million-year isotope record from siderites formed in modern ferruginous sediments

Aurèle Vuillemin, Christoph Mayr, Jan A. Schuessler, et al.

Published: 2022-02-17
Subjects: Biogeochemistry, Other Environmental Sciences, Sedimentology, Stratigraphy

Ancient iron formations hold important records of environmental conditions during the Precambrian Eons. Reconstructions of past oceanic systems require investigating modern ferruginous analogs to disentangle water column and diagenetic signals recorded in iron-bearing minerals. We analyzed oxygen, iron, and carbon isotopes in siderite, a ferrous carbonate phase commonly used as an environmental [...]

Macrostratigraphy of the Ediacaran System in North America

Daniel Christian Segessenman, Shanan E Peters

Published: 2022-02-11
Subjects: Earth Sciences, Geochemistry, Geology, Paleontology, Sedimentology, Stratigraphy, Tectonics and Structure

Ediacaran sediments record the termination of Cryogenian ‘Snowball Earth’ glaciations, preserve the first occurrences of macroscopic metazoans, and contain one of the largest known negative δ13C excursions (the Shuram-Wonoka). The rock record for the transition between the Proterozoic and Phanerozoic in North America is also physically distinct, with much of the continent characterized by a wide [...]

Indian Plate paleogeography, subduction, and horizontal underthrusting below Tibet: paradoxes, controvercies, and opportunities

Douwe J.J. van Hinsbergen

Published: 2022-02-06
Subjects: Earth Sciences, Geology, Geophysics and Seismology, Physical Sciences and Mathematics, Sedimentology, Tectonics and Structure, Volcanology

The India-Asia collision zone is the archetype to calibrate geological responses of continent-continent collision, but hosts a paradox: there is no orogen-wide geological record of oceanic subduction after initial collision around 60-55 Ma, yet thousands of kilometers of post-collisional subduction occurred before arrival of unsubductable continental lithosphere that currently horizontally [...]

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