• Our results show a long-term trend with most of the values plotting within the range of the global ocean strontium isotope curve and distinct short-term fluctuations on precessional time scale. (unipr.it)
  • Human mobility patterns in Falbygden were studied by applying strontium isotope analysis combined with archaeological and bioarchaeological data, including mtDNA and sex assessment on a large dataset encompassing 141 individuals from 21 megalithic graves. (springer.com)
  • Here we show that calcium carbonate (calcite) grains in Ryugu and Ivuna samples have variable 18 O/ 16 O and 13 C/ 12 C ratios that are, respectively, 24-46‰ and 65-108‰ greater than terrestrial standard values, whereas those of calcium-magnesium carbonate (dolomite) grains are much more homogeneous, ranging within 31-36‰ for oxygen and 67-75‰ for carbon. (nature.com)
  • The final dataset will cover inorganic nutrients, oxygen concentration, dissolved inorganic carbon, total alkalinity, He/Ne ratios for the estimation of basal melt water, δ18O for the contribution of meteoric water, particulate and dissolved organic carbon and nitrogen, optical properties (fluorescence), molecular characterization and radiocarbon age of organic matter. (awi.de)
  • 2009 ). The strontium (Sr) isotope ratios in humans mirror the isotope composition of bioavailable Sr in the area where people resided, assuming that they consumed locally procured water and food. (springer.com)
  • Sjögren and Price 2013a ) has demonstrated a clear distinction between the Sr isotope ratios in the Cambro-Silurian and the Precambrian regions. (springer.com)
  • The microorganism most frequently referenced for identifying marine isotope stages is foraminifera. (wikipedia.org)
  • We measured the carbon (δ13C), oxygen (δ18O) and strontium (87Sr/86Sr) isotope ratio of 50 samples of planktonic foraminifera, mollusk shells, gypsum and carbonate sediments from the Abad and Yesares Members (Turre and Caños Formation) in the Perales, Hueli, Los Yesos and Rio de Aguas sections. (unipr.it)
  • Stable carbon and oxygen isotope reconstructions based on benthic foraminifera, together with a high-resolution benthic foraminiferal record of Mg/Ca paleothermometry, is presented. (embrapa.br)
  • Here, we use a combination of a continuous high-resolution sea-level record, based on the stable oxygen isotopes of planktonic foraminifera from the central Red Sea and age constraints from coral data to estimate rates of sea-level change during MIS-5e. (blogspot.com)
  • This result forces a significant reinterpretation of the iconic Transvaal basin stratigraphy and implies that the oxygenation involved several oscillations in oxygen levels across 10-5 present atmospheric levels before the irreversible oxygenation of the atmosphere. (berger-odenthal.de)
  • However, it was suggested that a so-called specific difference between the hyperfine splittings in hydrogen-like and lithium-like ions of the same isotope can be used to cancel nuclear structure effects and provide an accurate test of QED [Shabaev et al. (fnal.gov)
  • These include: field parameters (e.g. electrical conductivity, temperature), major and trace ions (e.g. metals), stable isotopes of oxygen and hydrogen, industrial compounds (CFCs and SF6) and dissolved carbon isotopes (i.e. inorganic and organic forms). (edu.au)
  • We generated a 5.5-yr snapshot of biweekly-to-monthly resolved time series of carbon and oxygen isotope composition (δ 13 C and δ 18 O) and Sr/Ca and Mg/Ca from annually banded aragonite skeleton of a ~ 197 ka pristine Porites coral collected at Niue Island (19°00′S, 169°50′W) in the southwestern subtropical Pacific Ocean. (blogspot.com)
  • The carbon isotope composition of the siderite measured by conventional mass spectrometry shows the characteristic broad span of data, probably as a result of multiple stages of microbial activity. (lu.se)
  • All the various siderite morphologies have almost identical oxygen isotope values reflecting the palaeo-groundwater composition. (lu.se)
  • Stratigraphic analysis of a 5 m long permafrost core is based on various lithological (grain size, total organic carbon, magnetic susceptibility) and hydrochemical (oxygen isotope composition, major cation content) properties and pore ice content. (geomar.de)
  • The types of mineralization of these three stages differ from each other in the isotope composition sulfur of sulfides, oxygen and carbon of carbonates, as well as oxygen of oxides (magnetite). (igns.gov.ua)
  • Responsible for these fluctuations in oxygenation were likely driven by the Lomagundi carbon isotope excursion. (wikipedia.org)
  • 2.43-2.06 Ga) is commonly linked with the suggestion of an "oxygen overshoot" during the ∼2.22-2.06 Ga Lomagundi Event (LE), which represents Earth's most pronounced and longest-lived positive carbon isotope excursion. (st-andrews.ac.uk)
  • The first significant buildup in atmospheric oxygen, the Great Oxidation Event (GOE), began in the early Paleoproterozoic in association with global glaciations and continued until the end of the Lomagundi carbon isotope excursion ca. 2,060 Ma. (berger-odenthal.de)
  • Therefore, changes in glacial-interglacial oceanographic conditions are preserved in the oxygen isotopic profiles. (tamu.edu)
  • This report is the first of a high-resolution coral-based paleoclimate archive during the Marine Isotope Stage (MIS) 7 interglacial. (blogspot.com)
  • Published stable isotope data at Site U1304 has demonstrated that the site provides a particularly high resolution record of the last interglacial, where sedimentation rates were ~40 cm/k.y., where frequent thin diatom-rich layers inhibit bioturbation (Hodell et al. (iodp.org)
  • The last interglacial period, Marine Isotope Stage (MIS) 5e, was characterized by global mean surface temperatures that were at least 2 °C warmer than present. (blogspot.com)
  • Oxygen isotope stratigraphies based on both planktonic and benthic foraminifers are presently in development for this site. (iodp.org)
  • 2009). Planktonic oxygen isotope data from a number of planktonic foraminifer species are compared with benthic oxygen and carbon isotope data, yielding a unique picture of surface and deep water evolution during marine isotope stage (MIS) 5 (Hodell et al. (iodp.org)
  • These stages of mineral formation are volcanogenic-sedimentary, regional-metamorphogenic and local hydrothermal ones with corresponding mineral associations. (igns.gov.ua)
  • Diatom-bacteria aggregates are key for the vertical transport of organic carbon in the ocean. (frontiersin.org)
  • Sinking organic aggregates, also named "marine snow," are extensively studied, often with a focus on the vertical transport of organic carbon to the seafloor by the "biological pump" (e.g. (frontiersin.org)
  • Thus glacials (interglacials) are represented by laminated (massiv), anoxic (oxic) sediments with high (low) organic carbon and low (high) concentration of magnetic minerals. (gfz-potsdam.de)
  • 103 to 99.5 Ma) represents a global interval of enhanced organic carbon burial due to widespread oxygen deficiency in the water column and/or increased primary productivity. (uqar.ca)
  • A prominent increase in total organic carbon (TOC) values (up to 10%) is clearly recorded through the onset of OAE-1d, coinciding with a prominent change in overall redox-sensitive proxies suggesting that the La Grita Member sediments accumulated under anoxic (and possibly euxinic) bottom-water conditions in a partially restricted basin. (uqar.ca)
  • The records of the C/N ratio of bulk samples and carbon isotope ratio of the organic carbon (δ 13 C org ) suggest that the organic matter in the CbCS sediments during MIS 19c mostly originated from marine plankton, whereas the organic matter during MIS 18 and 19a was characterized by a mixture of marine plankton and terrestrial plants. (progearthplanetsci.org)
  • In addition, we calculated the mass accumulation rates (MARs) of organic carbon, biogenic carbonate, and terrigenous material for quantitative interpretations on the paleoenvironmental changes. (progearthplanetsci.org)
  • MAR calculations revealed that the contribution of marine organic carbon relative to terrestrial organic carbon increased during MIS 19c, and that the contribution of the terrigenous material relative to biogenic carbonate decreased during MIS 19c. (progearthplanetsci.org)
  • These variations were probably caused by the relative decrease in bottom-water oxygen level, which is also supported by our trace-fossil data, although it is not certain whether the increase in organic-carbon flux at ~ 760 ka was due to the synchronous increase in biogenic productivity in surface water. (progearthplanetsci.org)
  • For the area north and east of the Chatham Rise, upwelling and high productivity diatom indicators are used in conjunction with organic carbon and δ13C data to infer an increase in upwelling intensity (by virtue of increased wind intensity) commencing in oxygen isotope stage 4 and reaching maximum intensity during the Last Glacial Maximum. (ucl.ac.uk)
  • Primary productivity was assessed in incubations in the isotope container using radiocarbon labels. (awi.de)
  • Stable 15 N isotope incubations under dark and anoxic conditions revealed that axenic S. marinoi is able to reduce intracellular nitrate to ammonium that is immediately excreted by the cells. (frontiersin.org)
  • Instead, in vitro measurements provide an estimate of internally deposited iodine (both the stable and radioactive isotopes), utilizing techniques that measure iodine in body fluids, feces, or other human samples (Gautier 1983). (cdc.gov)
  • Alpha particle ( ionizing radiation ) - two neutrons and two protons bound as a single particle (a helium nucleus) that is emitted from the nucleus of certain radioactive isotopes in the process of disintegration. (cdc.gov)
  • Background radioactivity - radioactive elements in the natural environment including those in the crust of the earth (like radioactive potassium, uranium, and thorium isotopes) and those produced by cosmic rays. (cdc.gov)
  • Beta particle ( ionizing radiation ) - a charged particle emitted from the nucleus of certain unstable atomic nuclei (radioactive isotopes), having the charge and mass of an electron. (cdc.gov)
  • High IRD contents in the sediments reflect the presence of ice sheets on the Kara and Barents seas shelves and the hinterland during the entire oxygen isotope stage 6 (ca 190-130ka), in substage 5b (ca 90-80ka), at the stage boundary 5/4 (around 75ka), and in late stage 4/early stage 3 (ca 65-50ka). (geus.dk)
  • Atlantic Water inflow to the Arctic Ocean and seasonally open waters in the ice (leads) occurred during the interglacials of oxygen isotope stage 1 and substage 5e, during several interstadials (stage 3, substages 5a and 5c), and to a lesser degree within stadials and glacials (stages 2, 4, and 6). (geus.dk)
  • The Chiba GSSP occurs immediately below the top of Marine Isotope Substage (MIS) 19c and has an astronomical age of 774.1 ka. (springeropen.com)
  • Therefore, research on petrological and geochemical carbonate topics is critical for understanding the global carbonate cycle, as carbonate minerals comprise the largest reservoir of carbon in the Earth's lithosphere. (mdpi.com)
  • The use of laser ablation sampling for , H and C isotopes allows very high resolution in sampling and it should be possible tderive seasonal climatic reconstructions. (ahobproject.org)
  • Fossil pollen can be used within many stages tprovide high resolution environmental reconstructions. (ahobproject.org)
  • Oxygen isotope ratio cycles are cyclical variations in the ratio of the abundance of oxygen with an atomic mass of 18 to the abundance of oxygen with an atomic mass of 16 present in some substances, such as polar ice or calcite in ocean core samples, measured with the isotope fractionation. (wikipedia.org)
  • Oxygen isotope analysis considers only the ratio of 18O to 16O present in a sample. (wikipedia.org)
  • The isotope ratio in the calcite is therefore the same, after compensation, as the ratio in the water from which the microorganisms of a given layer extracted the material of the shell. (wikipedia.org)
  • Although the K/Ti ratio generally varies throughout the studied interval, the K/Ti ratio especially during Marine Isotope Stage (MIS) 19a shows a variation pattern like those of the foraminiferal oxygen isotope (δ 18 O) records. (progearthplanetsci.org)
  • Dansgaard-Oeschger (D-O) climate instabilities that took place during Marine Isotope Stage 3 are connected to changes in ocean circulation patterns and sea ice cover. (embrapa.br)
  • For the first time we combine outputs from a climate model with a thermodynamic iceberg model to simulate likely source regions for ice-rafted debris (IRD) found in the Nordic Seas from Marine Isotope Stage M2 to the mid-Piacenzian Warm Period and what this implies about the nature of the Arctic cryosphere at this time. (embrapa.br)
  • Use this activity alongside the Education in Chemistry article, Grounded: Keeping the carbon beneath our feet , to provide real-world context and link to scientific careers for your teaching around earth and atmosphere, climate change, global warming and the greenhouse effect. (rsc.org)
  • A higher abundance of 18O in calcite is indicative of colder water temperatures, since the lighter isotopes are all stored in the glacial ice. (wikipedia.org)
  • We infer that the calcite precipitated first over a wide range of temperatures and oxygen partial pressures, and that the proportion of gaseous CO 2 /CO/CH 4 molecules changed temporally. (nature.com)
  • Fig. 2: Oxygen isotope compositions of the calcite and dolomite in Ryugu and Ivuna samples. (nature.com)
  • Fig. 3: Comparison between C and O isotope compositions of the calcite and dolomite in Ryugu and Ivuna samples. (nature.com)
  • Carbon-isotope (δ13Ccarb and δ13CCorg) chemostratigraphy and biostratigraphic constraints show that the La Grita Member spans the late Aptian period (Rotalipora appenninica Zone), and that OAE-1d is well recorded in this succession. (uqar.ca)
  • Oxygen and carbon isotope records of planktic foraminifers from the analyzed sediment cores show a number of prominent excursions which can be interpreted as evidence for freshwater events in the Arctic Ocean. (geus.dk)
  • Geologo-strukturnye usloviya i etapy zolotonakopleniya v Srednepridneprovskoy granit-zelenokamennoy oblasti [Geological and structural conditions and stages of accumulation of gold in the middle of the Dnieper granite-greenstone region] / M. Korzhnev, V. Monahov, Yu. (igns.gov.ua)
  • The influence of metamorphic stage was determined by regional metamorphism intensity (facies of green shales and epidote-amphibolite) and with the point of view of ore productivity was not substantial. (igns.gov.ua)
  • The Lanna area in the province of Närke, south-central Sweden, hosts a succession of cool-water carbonate strata that are largely devoid of tectonic and diagenetic alteration, and span the Floian through lower Darriwilian Global stages (Ottenbyan-Kundan Regional stages). (lu.se)
  • Our findings thus have direct implications for the use of stable isotope data and the applications of stable isotopes in food web studies. (authorea.com)
  • Data are contextualized by comparisons with previously published Tiwanaku isotope data from the period. (who.int)
  • The EBI was developed over the course of four stages: 1) literature review to identify potential indicators, 2) data source acquisition and indicator variable construction, 3) index creation, and 4) stratification by land cover type. (cdc.gov)
  • Despite the importance of wood density for carbon sequestration and tree hydraulics, little is known about the factors controlling variations in wood density across the tree ring, i.e. micro-density, at the intra-annual scale. (copernicus.org)
  • The Global Boundary Stratotype Section and Point (GSSP) defining the base of the Chibanian Stage and Middle Pleistocene Subseries at the Chiba section, Japan, was ratified on January 17, 2020. (springeropen.com)
  • The primary guide to this boundary is the Matuyama-Brunhes (M-B) paleomagnetic reversal which falls within Marine Isotope Stage (MIS) 19. (springeropen.com)
  • ACARP project C28024 (Stage 1) is demonstrating how tracer analysis of groundwater and surface water can provide information on whether systems are hydrologically disconnected, partly connected or well connected. (edu.au)
  • Researchers funded by the Wellcome Trust used DNA and stable isotope analysis to show how children as young as 6-years old were "fattened up" and taken on a pilgrimage to their death. (scienceblog.com)
  • METHODS: We use stable isotope analysis of 43 human bone samples representing 14 females, 20 males, 8 juveniles, and 1 indeterminate individual recovered from burial excavations at the sites of Rio Muerto and Omo in the Moquegua Valley. (who.int)
  • Numbers from 1 to 7 denote marine oxygen isotope stages. (gfz-potsdam.de)
  • The Sorbas basin is a reference sector of the Mediterranean basin for the definition of the onset of the Messinian salinity crisis straddling the transition from the open marine deposits (Abad marls) to the Primary Lower Gypsum (Yesares Formation) during the first stage of the crisis, between 5.97 and 5.60 Ma. (unipr.it)
  • Geochronology - Established dating techniques will be used tconstrain the chronology and tie in biostratigraphical models with the independent marine isotope and polar ice core records. (ahobproject.org)
  • Oxygen (chemical symbol O) has three naturally occurring isotopes: 16O, 17O, and 18O, where the 16, 17 and 18 refer to the atomic mass. (wikipedia.org)
  • Events are color-coded by the associated injection stage and their size scales with magnitude. (bgs.ac.uk)
  • Concomitant decreases in bottom water oxygen and increases in the 14 C age of deep waters suggest that old, nutrient-rich waters influenced upper circumpolar deep water in the southwest Pacific during warming events. (essopenarchive.org)
  • Such a relative decrease in bottom-water oxygen level was partly due to the increased ocean stratification because of the northward displacement of the Kuroshio Extension Front. (progearthplanetsci.org)
  • Iron-limitation of export production, the expansion of Pacific Deep water, and increased wind-driven upwelling would all work to contribute to increasing atmospheric CO 2 through reduced drawdown, and increased outgassing from the Pacific carbon reservoir during the millennial-scale warming events of MIS-3. (essopenarchive.org)
  • Furthermore, the rise of atmospheric oxygen was not monotonic, but was instead characterized by oscillations, which together with climatic instabilities may have continued over the next 200 My until $≤2,250-2,240 Ma. (berger-odenthal.de)
  • In this study we assess the integrated biostratigraphic and chemostratigraphic framework for the Ordovician sequence at Lanna, utilizing trilobites and conodonts coupled with bulk-rock carbon and oxygen isotopes (δ 13 C carb and δ 18 O carb ). (lu.se)
  • SIMS (secondary ion mass spectrometry) revealed generally higher δ 13 C values for the concretionary cement than the perfectly zoned sphaerosiderite, spheroidal siderite and their overgrowths, which marks a change in the carbon source during burial. (lu.se)
  • Upwelling declined in a series of distinct stages commencing at ~17.7ka (18ka) calendar years, during the deglaciation phase of Termination 1. (ucl.ac.uk)
  • 2. Here, we conducted a 9-month feeding experiment to report Δ13C and Δ15N of muscle and liver tissue for several weight classes of Eurasian perch (Perca fluviatilis), a widespread teleost often studied using stable isotopes, but without established TDFs for feeding on a natural diet. (authorea.com)
  • Δ13C of muscle tissue), and especially highlight the substantial differences between individuals of different ontogenetic stages within a species. (authorea.com)
  • The limited expression of many named 'carbon isotope excursions' (CIEs) in the studied interval indicate that they are artefacts of local overprinting rather than reflective of changes to the global carbon cycle. (lu.se)
  • These in vivo measurement techniques are commonly used to measure body burdens of iodine radioisotopes, but cannot be used to assess the stable isotope of iodine. (cdc.gov)
  • This stage of the project is focusing on conventional tracers that are often used by other mining industries around the world (e.g. iron ore, potash) and in groundwater resource studies. (edu.au)
  • One hundred and fifty-eight diatom taxa are documented from 44 core-top samples and 11 cores which collectively cover the last 210ka, (to late oxygen isotope stage 7) Calender year ages are used throughout this report. (ucl.ac.uk)
  • Dr Wilson and colleagues studied DNA and stable light isotopes from the hair samples to offer insight into the lives of these children. (scienceblog.com)
  • By analysing stable isotopes found in the hair samples, Dr Wilson and colleagues were able to see that for much of the time prior to sacrifice, the children were fed a diet of vegetables such as potato, suggesting that they came from a peasant background. (scienceblog.com)
  • Overall, the carbon and oxygen isotope records, TOC contents, as well as the detrital proxies show cyclic variation during the late Albian stage. (uqar.ca)
  • Qunf Cave oxygen isotope (δ18Oc) record from southern Oman is one of the most significant of few Holocene Indian summer monsoon cave records. (bvsalud.org)
  • Ongeluk Formation volcanism at ca. 2,426 Ma was part of a large igneous province (LIP) and represents a waning stage in the emplacement of several temporally discrete LIPs across a large low-latitude continental landmass. (berger-odenthal.de)
  • Thus, the geological conditions of Falbygden provide an ideal setting for mobility studies based on Sr isotopes. (springer.com)
  • Carbon and oxygen isotopes of cool-water bryozoans from the Great Australian Bight and their paleoenvironmental significance. (tamu.edu)
  • Cooler, but still relatively warm surface water is inferred for interstadial oxygen isotope stage 3, and the coolest surface waters are inferred for the Last Glacial Maximum. (ucl.ac.uk)
  • This implies that the Western Mediterranean did not experience a main disconnection from the global ocean water before and during the first stage of the Messinian salinity crisis and that different Milankovitch forcings played a significant role in determining the seawater geochemistry. (unipr.it)