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| Open AccessCirculation of hydraulically ponded turbidity currents and the filling of continental slope minibasins
Gravity currents transporting particulates down continental slopes can encounter large depressions. Current interactions with confining topography induce horizontal circulation cells that control deposition of sediment in depressions and reduce their capacity to trap particulates.
- J. Kevin Reece
- , Robert M. Dorrell
- & Kyle M. Straub
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Article
| Open AccessLoess deposits in the low latitudes of East Asia reveal the ~20-kyr precipitation cycle
Earth’s orbit has tuned the variations of the East Asian summer monsoon. Here, a low latitude loess palaeoclimate record provides evidence that variation in monsoon rainfall is dominated by the precession cycle.
- Xusheng Li
- , Yuwen Zhou
- & Huayu Lu
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Article
| Open AccessShoreface erosion counters blue carbon accumulation in transgressive barrier-island systems
Landward barrier migration facilitates erosion of shoreface-exposed marsh and lagoon carbon stocks at rates outpacing backbarrier carbon accumulation, thus demonstrating the ephemeral nature of blue carbon storage along transgressive coasts.
- Mary Bryan Barksdale
- , Christopher J. Hein
- & Matthew L. Kirwan
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| Open AccessGlobal distribution and dynamics of muddy coasts
14% of the world’s coastlines are muddy and the majority of them are eroding at rates exceeding 1 m per year over the last three decades, according to an automated classification method that identifies global coastlines.
- Romy Hulskamp
- , Arjen Luijendijk
- & Stefan Aarninkhof
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| Open AccessGlobal climate forcing on late Miocene establishment of the Pampean aeolian system in South America
Wind-blown dust accumulation in central South America began during a period of global cooling and has persisted for millions of years. This corresponds with the expansion of the Chinese Loess Plateau and is consistent with bihemispheric forcing.
- Blake Stubbins
- , Andrew L. Leier
- & Mary Kate Fidler
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Article
| Open AccessEarthquake-enhanced dissolved carbon cycles in ultra-deep ocean sediments
Earthquakes enhance dissolved carbon production and fuel the microbial activities in hadal trench subsurface sediments, and ultimately strengthen carbon accumulation and transformation in the subduction zones.
- Mengfan Chu
- , Rui Bao
- & Sarah Zellers
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Article
| Open AccessQuantitative constraints on flood variability in the rock record
Dunes and woody-debris preserved in the rock record have been used to quantify the magnitude and duration of flow events in ancient rivers, revealing a fluvial system dominated by flashy, storm-driven floods 300 million years ago.
- Jonah S. McLeod
- , James Wood
- & Alexander C. Whittaker
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| Open AccessClimate-controlled submarine landslides on the Antarctic continental margin
Changes in climate preconditioned large-scale, recurrent Miocene to Pleistocene Antarctic submarine landslides through variations in biological productivity, ice proximity and ocean circulation, posing tsunami risk to Southern Hemisphere populations.
- Jenny A. Gales
- , Robert M. McKay
- & Zhifang Xiong
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Article
| Open AccessRevised Minoan eruption volume as benchmark for large volcanic eruptions
The authors use seismic and sedimentology data to estimate the volume of the Minoan eruption. The results show that the Plinian phase contributed most to the distal tephra fall, and that the pyroclastic flow volume is significantly smaller than previously assumed.
- Jens Karstens
- , Jonas Preine
- & Christian Berndt
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| Open AccessSediment delivery to sustain the Ganges-Brahmaputra delta under climate change and anthropogenic impacts
The potential for enhanced sediment delivery to the Ganges-Brahmaputra delta exists, but it alone is insufficient to sustain the system. The delta may be resilient to climate change, but only in the absence of dam construction and water diversions.
- Jessica L. Raff
- , Steven L. Goodbred Jr.
- & Lauren A. Williams
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| Open AccessInadequacy of fluvial energetics for describing gravity current autosuspension
This study shows that the total energy loss of gravity currents has a non-linear dependence on the work required to keep sediment in suspension, highlighting the importance of large-scale mixing for the particulate transport of gravity currents.
- Sojiro Fukuda
- , Marijke G. W. de Vet
- & Robert M. Dorrell
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Article
| Open AccessMilankovitch-paced erosion in the southern Central Andes
Fisher et al. combine sediment geochemistry and climate modelling to reveal long-term synchrony between erosion rates and orbitally-driven climate oscillations in the tectonically-active southern Central Andes.
- G. Burch Fisher
- , Lisa V. Luna
- & Lucas J. Lourens
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Article
| Open AccessPermafrost in the Cretaceous supergreenhouse
The archetypal supergreenhouse Cretaceous Earth had an active cryosphere with permafrost in plateau deserts. A modern analogue is the aeolian–permafrost system from the Qiongkuai Lebashi Lake area, Xinjiang Uygur Autonomous Region, China.
- Juan Pedro Rodríguez-López
- , Chihua Wu
- & Chao Ma
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Article
| Open AccessA dimensionless framework for predicting submarine fan morphology
Submarine fans play an important role in routing sediment in continental and deep water settings. Here the authors develop a framework is to explain the shape of submarine fans using a numerical model framework which can either predict seafloor topography from turbidity current flow properties or infer these flow properties from seafloor topography.
- Abdul Wahab
- , David C. Hoyal
- & Kyle M. Straub
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| Open AccessCycles of Andean mountain building archived in the Amazon Fan
South American cordilleran orogenic systems have repeated complex magmatic and deformation histories. Here the authors analyze detrital zircons found in the Amazon deep-sea fan that record mountain-building events and reveal cycles of orogenesis with periods of ~60–90 Myr since the Phanerozoic.
- Cody C. Mason
- , Brian W. Romans
- & Andrea Fildani
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Article
| Open AccessA globally relevant stock of soil nitrogen in the Yedoma permafrost domain
A climate sensitive permafrost region (Yedoma domain) was found to contain globally relevant N stock of >40 Gt nitrogen, of which 4 to 16 Gt of the N could become available by thaw until 2100. This study increases the current estimates by nearly 50%.
- Jens Strauss
- , Christina Biasi
- & Guido Grosse
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Article
| Open AccessEolian chronology reveals causal links between tectonics, climate, and erg generation
Modeling cosmogenic nuclides concentrations from Kalahari Desert Sand reveals the time of sand introduction into the landscape. This coincides with morphotectonic and climatic changes that could have triggered sand production and its impact on the environment.
- Shlomy Vainer
- , Ari Matmon
- & Karim Keddadouche
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Article
| Open AccessAstrochronology of the Paleocene-Eocene Thermal Maximum on the Atlantic Coastal Plain
Astrochronology of a core in Maryland suggests that the onset of the Paleocene-Eocene Thermal Maximum (PETM) warming lasted about 6 thousand years. These data are more consistent with astronomical forcing than an extraterrestial trigger for the PETM.
- Mingsong Li
- , Timothy J. Bralower
- & Marci M. Robinson
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| Open AccessRainfall and sea level drove the expansion of seasonally flooded habitats and associated bird populations across Amazonia
This study found that millennial periods of higher rainfall combined with rising sea level enhanced sediment accumulation in Amazonian rivers valleys. This fuelled synchronous expansion of vegetation adapted to seasonally flooded substrates and its specialized bird populations, showing how global climate changes can affect specific Amazonian species.
- A. O. Sawakuchi
- , E. D. Schultz
- & C. C. Ribas
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Article
| Open AccessChallenging the highstand-dormant paradigm for land-detached submarine canyons
Powerful avalanches were recorded for the first time in an underwater canyon that lies 100 s of km from land. This challenges a long-held view and indicates > 1000 similar canyons worldwide actively pump sediment and pollutants into the deep-sea.
- M. S. Heijnen
- , F. Mienis
- & M. A. Clare
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| Open AccessA westerly wind dominated Puna Plateau during deposition of upper Pleistocene loessic sediments in the subtropical Andes, South America
Detrital zircon ages in Pleistocene sediments and wind erosion patterns indicate the Puna Plateau was dominated by westerly winds during intervals of high dust accumulation in the eastern subtropical Andes.
- Alex Pullen
- , David L. Barbeau Jr
- & Mary Kate Fidler
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| Open AccessEarth’s geodynamic evolution constrained by 182W in Archean seawater
Banded iron formations, precipitates of Precambrian seawater, record global 182W isotope signatures derived from continental weathering and hydrothermal mantle fluxes into ancient oceans, tracking Earth’s geodynamic evolution through deep time.
- A. Mundl-Petermeier
- , S. Viehmann
- & C. Münker
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Article
| Open AccessThe Chengjiang Biota inhabited a deltaic environment
The Chengjiang Biota is the earliest most diverse animal community from the Cambrian Explosion (~518 million years ago). This biota is shown to have colonized a delta, highlighting the importance of this shallow environment in recording early snapshots of life on Earth.
- Farid Saleh
- , Changshi Qi
- & Xiaoya Ma
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| Open AccessIntensified continental chemical weathering and carbon-cycle perturbations linked to volcanism during the Triassic–Jurassic transition
The work shows that volcanic-related elevated continental chemical weathering could have played a significant role in global environmental perturbations during the Triassic-Jurassic mass extinction.
- Jun Shen
- , Runsheng Yin
- & Shucheng Xie
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Article
| Open AccessMorphodynamic limits to environmental signal propagation across landscapes and into strata
A new quantitative tool provides a volumetric assessment of environmental signal propagation and transfer in sediment routing systems, that could have broad applicability and utility in the field.
- Stephan C. Toby
- , Robert A. Duller
- & Kyle M. Straub
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| Open AccessExistence of a continental-scale river system in eastern Tibet during the late Cretaceous–early Palaeogene
This study provides evidence for a continental-scale river system that existed in eastern Tibet before the India-Asia collision. The river system developed an extensive low-relief landscape, which was uplifted and dissected during the late Cenozoic.
- Xudong Zhao
- , Huiping Zhang
- & Peizhen Zhang
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Article
| Open AccessSand spikes pinpoint powerful palaeoseismicity
Sand spikes, sandstone bodies that have been enigmatic for nearly two centuries, represent a new type of seismite and a promising tool to identify strong impact-induced or tectonic paleo-earthquakes and their source regions in the geologic record.
- Elmar Buchner
- , Volker J. Sach
- & Martin Schmieder
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Article
| Open AccessGateway-driven weakening of ocean gyres leads to Southern Ocean cooling
The role of Southern Ocean gateways contributing to the Eocene-Oligocene climate transition is still debated. Here, the authors present high-resolution ocean simulations to show that gateways opening led to a reorganization of ocean circulation, heat transport and Antarctic surface water cooling.
- Isabel Sauermilch
- , Joanne M. Whittaker
- & Joseph H. LaCasce
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| Open AccessLethal microbial blooms delayed freshwater ecosystem recovery following the end-Permian extinction
Harmful algal and bacterial blooms are increasingly frequent in lakes and rivers. From the Sydney Basin, Australia, this study uses fossil, sedimentary and geochemical data to reveal bloom events following forest ecosystem collapse during the end-Permian event and that blooms have consistently followed warming-related extinction events, inhibiting the recovery of freshwater ecosystems for millennia.
- Chris Mays
- , Stephen McLoughlin
- & Vivi Vajda
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Article
| Open AccessOrbital forcing of ice sheets during snowball Earth
Reconciling the Snowball Earth hypothesis with sedimentological cyclicity has been a persistent challenge. A new cyclostratigraphic climate record for a Cryogenian banded iron formation in Australia provides evidence for orbital forcing of ice sheet advance and retreat cycles during Snowball Earth.
- Ross N. Mitchell
- , Thomas M. Gernon
- & Xiaofang He
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| Open AccessQuantitative comparison of geological data and model simulations constrains early Cambrian geography and climate
There is a lot of uncertainty about what Earth’s climate and geography were like in the early Cambrian, when animal life diversified throughout the oceans. Here we show that numeric comparisons of model simulations and climatically influenced rocks can help constrain geography and climate during this time.
- Thomas W. Wong Hearing
- , Alexandre Pohl
- & Thijs R. A. Vandenbroucke
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Article
| Open AccessNon-lithifying microbial ecosystem dissolves peritidal lime sand
Present et al. examine the processes controlling lithification of microbial mats in a Caribbean peritidal carbonate environment. The authors present sedimentological and geochemical evidence of a surprising bias against preserving the most robust, widespread microbial ecosystems in the sedimentary record.
- Theodore M. Present
- , Maya L. Gomes
- & John P. Grotzinger
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Article
| Open AccessSubmarine landslide megablocks show half of Anak Krakatau island failed on December 22nd, 2018
The authors here present a detailed reconstruction of the landslide mass following the 2018 eruption of Anak Krakatau. Bathymetry data reports the volume of the collapsed submarine flank to be much larger than previously reported.
- J. E. Hunt
- , D. R. Tappin
- & U. Udrekh
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Article
| Open AccessAnatomy of subcritical submarine flows with a lutocline and an intermediate destruction layer
This study investigates the underlying physical mechanisms of turbidity currents travelling thousands of miles in confined submarine settings, rather than diffusing after short distance. Using high resolution simulations with up to a billion grid points helps to understand the evolving layered structure of a current.
- Jorge S. Salinas
- , S. Balachandar
- & M. I. Cantero
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Article
| Open AccessSeismic control of large prehistoric rockslides in the Eastern Alps
The authors here present a multi-lake paleoseismological approach to evaluate the role of earthquakes in causing a spatio-temporal cluster of large, prehistoric rockslides between 3000 and 4200 years ago in the Eastern European Alps and for which the triggering mechanisms are still debated.
- Patrick Oswald
- , Michael Strasser
- & Jasper Moernaut
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| Open AccessThe human impact on North American erosion, sediment transfer, and storage in a geologic context
Human activities have accelerated soil erosion and landscape change in many areas. Here the authors show how rates of erosion, sediment transfer and alluvial sedimentation have increased by an order of magnitude across North America since European colonization, far exceeding the rates expected of natural processes.
- David B. Kemp
- , Peter M. Sadler
- & Veerle Vanacker
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Article
| Open AccessGlobal phosphorus shortage will be aggravated by soil erosion
Phosphorus is an essential nutrient critical for agriculture, but because it is non-renewable its future availability is threatened. Here the authors show that across the globe most nations have net losses of phosphorus, with soil erosion as the major route of loss in Europe, Africa and South America.
- Christine Alewell
- , Bruno Ringeval
- & Pasquale Borrelli
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| Open AccessLarge-scale mass wasting in the western Indian Ocean constrains onset of East African rifting
The authors describe a huge submarine landslide deposit offshore Tanzania and highlight that large and potentially tsunamigenic landslide events are associated with plateau uplift and continental rifting in East Africa.
- Vittorio Maselli
- , David Iacopini
- & Dick Kroon
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| Open AccessCoastal sedimentation across North America doubled in the 20th century despite river dams
The proliferation of dams since 1950 has promoted sediment deposition in reservoirs, which is thought to be starving the coast of sediment and decreasing resistance to storms and sea-level rise. Here, the authors show that century-long records of sediment mass accumulation rates and sediment accumulation rates more than doubled after 1950 in coastal depocenters around North America.
- A. B. Rodriguez
- , B. A. McKee
- & A. N. Atencio
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Article
| Open AccessRapidly-migrating and internally-generated knickpoints can control submarine channel evolution
The authors analyse 9 years of time-lapse surveys in Bute Inlet, British Columbia (CA), to show how an active submarine channel evolves. They show how channel evolution is controlled by fast upstream-migration of steep knickpoints, which are similar to waterfalls in rivers.
- Maarten S. Heijnen
- , Michael A. Clare
- & John E. Hughes Clarke
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| Open AccessA bedform phase diagram for dense granular currents
In this study, Smith and colleagues employ analogue experiments to show the controlling parameters on sediment bedforms in pyroclastic density current deposits. The findings are applied and validated on natural deposits.
- Gregory Smith
- , Peter Rowley
- & Samuel Capon
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Article
| Open AccessLarge mass-independent sulphur isotope anomalies link stratospheric volcanism to the Late Ordovician mass extinction
Identification of stratospheric volcanic eruptions in the geological record and their link to mass extinction events during the past 540 million years remains challenging. Here, the authors report unexpected, large mass-independent sulphur isotopic compositions of pyrite in Late Ordovician sedimentary rocks, which they suggest originates from stratospheric volcanism linked to the first pulse of the Late Ordovician mass extinction.
- Dongping Hu
- , Menghan Li
- & Yanan Shen
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Article
| Open AccessSediment controls dynamic behavior of a Cordilleran Ice Stream at the Last Glacial Maximum
Tidewater glaciers in fjords can advance/retreat independent of climate due to stabilization by sediments at their termini. We show that an Alaskan paleo-ice stream behaved similarly on an open shelf, suggesting that increased sediment flux may delay catastrophic retreat of outlet glaciers in a warming world.
- Ellen A. Cowan
- , Sarah D. Zellers
- & Stewart J. Fallon
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Article
| Open AccessA general orientation distribution function for clay-rich media
A reference function for describing the orientation of clay platelets in clay-rich materials is still lacking, but is necessary for applications such as prediction of water and solute transfer and designs of innovative materials. Here, the authors determine a reference orientation function of clay platelets, and validate their function for both engineered and natural clay-rich media.
- Thomas Dabat
- , Fabien Hubert
- & Eric Ferrage
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Article
| Open AccessCritical dependence of morphodynamic models of fluvial and tidal systems on empirical downslope sediment transport
Morphological development of fluvial and tidal systems is increasingly forecasted by models, with most of them predicting unrealistically high channel incision. Here, the authors point out reasons why and suggest improvements.
- A. W. Baar
- , M. Boechat Albernaz
- & M. G. Kleinhans
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Article
| Open AccessOrganic sulfur was integral to the Archean sulfur cycle
Marine chemistry during the Early Earth (over 2.7 billion years ago) is commonly inferred to have been inorganically sulfate-reducing. Here, the authors argue that organic sulfur cycling may have played a previously unrecognized, yet important, role in the formation of ancient Archean marine sulfides.
- Mojtaba Fakhraee
- & Sergei Katsev
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Article
| Open AccessNew flow relaxation mechanism explains scour fields at the end of submarine channels
The nature of erosion featured at the outlet of submarine channels is still a topic of debate. Here the authors present, based on scaled experiments, a novel flow mechanism for turbidity currents at the end of submarine channels and for the first time describe their erosional character.
- F. Pohl
- , J. T. Eggenhuisen
- & M. J. B. Cartigny
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Article
| Open AccessMicrobially induced potassium enrichment in Paleoproterozoic shales and implications for reverse weathering on early Earth
The transition from smectite to illite requires potassium incorporation, yet the role of microbes in facilitating K+ uptake remains debated, especially during the early Earth. Here, the authors suggest that the Paleoproterozoic microbial mats extracted potassium from sea water and induced localized illitization during early low-temperature diagenesis.
- Jérémie Aubineau
- , Abderrazak El Albani
- & Kurt O. Konhauser
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Article
| Open AccessPotentially large post-1505 AD earthquakes in western Nepal revealed by a lake sediment record
Sediments have the potential to preserve the signature of geologic events such as earthquakes. Here, the authors provide a paleoseismological analysis of the sediments of Lake Rara, Nepal, to reconstruct the number of earthquakes that caused lake shaking and subsequent turbidite deposition during the last centuries.
- Z. Ghazoui
- , S. Bertrand
- & P. A. van der Beek