Results 11 to 20 of about 23,480 (273)

The Osmium Isotope Signature of Phanerozoic Large Igneous Provinces

open access: yesGeophysical Monograph Series, Page 229-246., 2021

Exploring the links between Large Igneous Provinces and dramatic environmental impact

An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Alexander J. Dickson   +2 more
wiley  

+5 more sources

Clumped Isotope Temperature Reconstruction Using Stalagmite Drip Cups. [PDF]

open access: yesRapid Commun Mass Spectrom
ABSTRACT Rationale Application of clumped isotope palaeothermometry to speleothems (carbonate cave deposits, e.g., stalagmites and flowstones) has been restricted largely to subaqueous samples because of kinetic fractionation processes that occur during subaerial speleothem formation, which lead to erroneously high inferred temperatures.
Umbo S   +11 more
europepmc   +2 more sources

Is comparability of C-14 dates an issue?: A status report on the fourth international radiocarbon intercomparison [PDF]

open access: yes, 2001
For more than 15 years, the radiocarbon community has participated in a series of laboratory intercomparisons in response to the issue of comparability of measurements as perceived within the wider user communities (Scott et al.
Bryant, C.,   +11 more
core   +5 more sources

Should archaeologists care about 14C inter-comparisons? Why? A summary report on SIRI [PDF]

open access: yes, 2017
Radiocarbon (14C) dating is used widely in many projects as a basis for the creation and testing of chronological constructs. 14C measurements are by their nature complex and the degree of sample pretreatment varies considerably depending on the material.
Cook, G.T., Naysmith, P., Scott, E.M.
core   +1 more source

Thermoluminescence and radiocarbon dating of pre-colonial ceramics and organic midden material from the US Virgin Islands: outline for a revised chronology

open access: yesHeritage Science, 2023
A sample of 128 pottery shards curated by the National Museum of Denmark, from seven archaeological sites in the US Virgin Islands, has been dated using the thermoluminescence dating (TL) technique with the purpose of refining local pre-colonial pottery ...
Joshua Torres   +6 more
doaj   +1 more source

First steps in reconstructing Early Jurassic sea water temperatures in the Andean Basin of northern Chile based on stable isotope analyses of oyster and brachiopod shells

open access: yesJournal of Palaeogeography, 2019
The stable isotope (δ13C, δ18O) composition of a collection of Lower Jurassic brachiopods and oysters from the Andean Basin of northern Chile was analyzed.
Matthias Alberti   +2 more
doaj   +1 more source

Labrador Sea freshening at 8.5 ka BP caused by Hudson Bay Ice Saddle collapse

open access: yesNature Communications, 2019
The exact freshwater scenario that caused the 8.2 ka cold event is still debated. This study presents new evidence for a severe Labrador shelfwater freshening 8500 years ago that was caused by the Hudson Bay Ice Saddle collapse following a warming in ...
Annalena Antonia Lochte   +6 more
doaj   +1 more source

Late Precambrian U-Pb titanite age for peak regional metamorphism and deformation (Knoydartian orogeny) in the western Moine, Scotland [PDF]

open access: yes, 2003
There has been controversy over the number and timing of orogenies in the Precambrian Moine block in the Scottish Caledonides since the earliest radiometric dating in the 1960s. This work challenges a recent hypothesis, that this sector of the Laurentian
Evans, J.A., Tanner, P.W.G.
core   +1 more source

Deposition chronologies in a peat bog from Spitsbergen (High Arctic) using the 210Pb dating method [PDF]

open access: yesPolish Polar Research, 2022
This study reports on the accumulation rates and 210Pb fluxes in Spitsbergen, Svalbard archipelago, wetlands. Six peat cores were collected in the Hornsund region, SW Spitsbergen (77°N) in 2007.
Anna Cwanek, Edyta Łokas
doaj   +1 more source

Radiocarbon Palaeolithic Europe database: A regularly updated dataset of the radiometric data regarding the Palaeolithic of Europe, Siberia included.

open access: yesData in Brief, 2020
At the Berlin INQUA Congress (1995) a working group, European Late Pleistocene Isotopic Stages 2 & 3: Humans, Their Ecology & Cultural Adaptations, was established under the direction of J.
Pierre M. Vermeersch
doaj   +1 more source

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