Results 111 to 120 of about 1,510,864 (232)

Soil wetting and drying processes influence stone artefact distribution in clay‐rich soils: A case study from Middle Gidley Island in Murujuga, northwest Western Australia

Archaeometry, EarlyView.
Abstract Soils that contain swelling clay minerals (e.g., montmorillonite) expand and contract during wetting and drying, causing movement within the soil profile. This process, known as argilliturbation, can alter artefact distributions, destroy stratigraphy and complicate the interpretation of archaeological deposits.
Caroline Mather, Matthias Leopold, Kaitlin Sullivan, Kane Ditchfield, Tom Horrocks, Luke Gliganic, Emma Beckett, Diana Patalwala, Emielda Yusiharni, Michael Smirk, William Hiscock, Jo McDonald   +11 more
wiley   +1 more source

Response of Remote Tropical West Pacific Islands to Climate Variability: A Multiproxy Record From T‐Lake, Palau, Spanning the Early Holocene to Present

Archaeometry, EarlyView.
ABSTRACT Lake sediments are natural archives of past environmental dynamics and how these systems have responded to past climate variability. Sediment geochemistry, governed by local geology and climate processes, is unique to each lake‐catchment and geochemical proxies must be validated for each study site.
Jalene Nalbant, Larissa Schneider, Jessica L. Blois, Matthew Wolhowe, Julian P. Sachs, Simon G. Haberle, Geoffrey Clark   +6 more
wiley   +1 more source

Ocean Alkalinity Enhancement Incubation Experiments with Particle Seeding (GC2021 KOSMOS experiment) - carbonate chemistry

This data set reports on treatment levels and carbonate chemistry variables from an incubation study that took place parallel to the KOSMOS mesocosm experiment on ocean alkalinity enhancement (Sept./Oct. 2021) in Taliarte Harbour, Gran Canaria.
Hartmann, Jens, Schneider, Julieta, Suitner, Niels   +2 more
core   +1 more source

Stability assessment of calcium carbonate dissolution as a marine carbon dioxide removal mechanism

Frontiers in Marine Science
Ocean Alkalinity Enhancement (OAE) is a promising approach for removing carbon dioxide from the atmosphere by increasing seawater alkalinity. However, the effectiveness of OAE depends on avoiding the precipitation of calcium carbonate (CaCO3) that would ...
Amanda B. Melendez-Perez, Kimberly Gilbert, Tyler Cyronak   +2 more
doaj   +1 more source

Siliceous sponges or seawater as a silicon source? Tracing silicon burial pathways of the Upper Cretaceous opal‐CT deposits using δ30Si and δ7Li

Sedimentology, EarlyView.
ABSTRACT Classical models of formation of sedimentary siliceous rocks (flint, chert, opoka) commonly assume that the Cretaceous marine silicon (Si) cycle was primarily biologically controlled, broadly analogous to the modern ocean. In this framework, siliceous sponges are regarded as the principal source of dissolved silica (dSi) to sediment porewaters,
Agata Jurkowska, Ewa Świerczewska‐Gładysz, Marek Szczerba, Tomáš Magna, Szymon Kowalik Filipowicz   +4 more
wiley   +1 more source

Philanthropy Brief: Ocean Alkalinity Enhancement

Ocean alkalinity enhancement (OAE) aims to alter seawater chemistry by increasing its alkalinity and, in turn, the ocean's capacity to absorb carbon dioxide.

core  

Modeling Ocean Alkalinity Enhancement in Subduction Regions and the Global Ocean

Anthropogenic CO2 emissions have driven global warming since the Industrial Revolution, necessitating a phasing out of fossil fuels to limit warming to well below 2degC, preferably 1.5degC, as outlined in the Paris Agreement. However, emission reductions alone are unlikely to be sufficient to meet these targets, highlighting the need for large-scale ...
openaire   +3 more sources

Coccolithophores and diatoms resilient to ocean alkalinity enhancement: A glimpse of hope? [PDF]

Sci Adv, 2023
Gately JA, Kim SM, Jin B, Brzezinski MA, Iglesias-Rodriguez MD.   +4 more
europepmc   +1 more source

Salt Range Formation of Pakistan Preserves Unique Record of Volcanic Fertilization During the Ediacaran Shuram Excursion

Terra Nova, EarlyView.
ABSTRACT Thin, discontinuous, organic‐rich oil shale beds in the siliciclastic‐evaporitic Salt Range Formation (SRF) of Pakistan are of approximate Neoproterozoic to Cambrian age based on stratigraphic constraints. The beds are enriched (26–43 wt.% total organic carbon, TOC) in aliphatic organic matter (OM) of low thermal maturity despite their ...
Paul C. Hackley, Ryan J. McAleer, Jay M. Thompson, Brett J. Valentine, Imran Khan   +4 more
wiley   +1 more source

Tectonic Forcing of Diachronous Salt Deposition During the Badenian Salinity Crisis Revealed by U–Pb Dating of Tephra Overlying Tuzla Basin Evaporites

Terra Nova, EarlyView.
ABSTRACT During the Middle Miocene Badenian Salinity Crisis (BSC), extensive evaporites formed across different tectonic settings in the Central Paratethys. Limited age constraints hamper evaporite correlation and identification of driving mechanisms. Here, we use U–Pb dating of zircon by LA‐ICP‐MS from tephra overlying the Tuzla Basin evaporites.
Nevena Andrić‐Tomašević, Oleg Mandic, Wout Krijgsman, Armin Zeh, Stjepan Ćorić, Sejfudin Vrabac   +5 more
wiley   +1 more source