Relevant bibliographies by topics / Ca isotopic measurements

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Ca isotopic measurements'

Author: Grafiati
Published: 6 September 2023
Last updated: 31 July 2025

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Journal articles on the topic "Ca isotopic measurements"

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Hillaire-Marcel, Claude, та Christiane Causse. "The Late Pleistocene Laurentide Glacier: Th/U Dating of its Major Fluctuations and δ18O Range of the Ice". Quaternary Research 32, № 2 (1989): 125–38. http://dx.doi.org/10.1016/0033-5894(89)90070-7.

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AbstractDirect information on the isotopic composition and timing of the now-vanished Laurentide glacier can be found in subglacial calcite or in early diagenetic concretions from glaciolacustrine deposits. Th/U isotopic measurements on early diagenetic concretions frome Lake Deschaillons varves (St. Lawrence Lowland, Québec) date the early Wisconsinan major ice advance at ca. 80,000 yr (isotopic stage 5a/4 transition). Significant retreat occurred at ca. 46,000 yr (isotopic stage 3) as indicated by Th/U isochrones on early diagenetic concretions from Lake Gayhurst varves in the Appalachian fo
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Herbert, Timothy D., Rocio Caballero-Gill, and Joseph B. Novak. "A revised mid-Pliocene composite section centered on the M2 glacial event for ODP Site 846." Climate of the Past 17, no. 3 (2021): 1385–94. http://dx.doi.org/10.5194/cp-17-1385-2021.

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Abstract. The composite section from ODP Site 846 has provided key data sets for Pliocene stable isotope and paleoclimatic time series. We document here apparent outliers in previously published data sets for stable isotopes and alkenone-derived sea surface temperature (SST) estimates in the Pliocene interval containing the M2 glaciation (ca. 3.290–3.3 Ma) by tying high-resolution core measurements to a continuous downhole conductivity log. We generate a revised sequence of new stable isotopic and alkenone measurements across the M2 event that correlate well to the revised splices of color ref
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Mennekes, David, Michael Rinderer, Stefan Seeger, and Natalie Orlowski. "Ecohydrological travel times derived from in situ stable water isotope measurements in trees during a semi-controlled pot experiment." Hydrology and Earth System Sciences 25, no. 8 (2021): 4513–30. http://dx.doi.org/10.5194/hess-25-4513-2021.

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Abstract. Tree water uptake processes and ecohydrological travel times have gained more attention in recent ecohydrological studies. In situ measurement techniques for stable water isotopes offer great potential to investigate these processes but have not been applied much to tree xylem and soils so far. Here, we used in situ probes for stable water isotope measurements to monitor the isotopic signatures of soil and tree xylem water before and after two deuterium-labeled irrigation experiments. To show the potential of the method, we tested our measurement approach with 20-year-old trees of th
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Alvarez Caraveo, Blanca, Maxence Guillermic, Alan Downey-Wall та ін. "Magnesium (Mg∕Ca, δ26Mg), boron (B∕Ca, δ11B), and calcium (Ca2+) geochemistry of Arctica islandica and Crassostrea virginica extrapallial fluid and shell under ocean acidification". Biogeosciences 22, № 12 (2025): 2831–51. https://doi.org/10.5194/bg-22-2831-2025.

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Abstract. The geochemistry of biogenic carbonates has long been used as proxies to record changing seawater parameters. However, the effect of ocean acidification (OA) on seawater chemistry and organism physiology could impact isotopic signatures and how elements are incorporated into the shell. In this study, we investigated the geochemistry of three reservoirs important for biomineralization – seawater, the extrapallial fluid (EPF), and the shell – in two bivalve species: Crassostrea virginica and Arctica islandica. Additionally, we examined the effects of three ocean acidification condition
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Keller, Kathrin M., Sebastian Lienert, Anil Bozbiyik, et al. "20th century changes in carbon isotopes and water-use efficiency: tree-ring-based evaluation of the CLM4.5 and LPX-Bern models." Biogeosciences 14, no. 10 (2017): 2641–73. http://dx.doi.org/10.5194/bg-14-2641-2017.

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Abstract. Measurements of the stable carbon isotope ratio (δ13C) on annual tree rings offer new opportunities to evaluate mechanisms of variations in photosynthesis and stomatal conductance under changing CO2 and climate conditions, especially in conjunction with process-based biogeochemical model simulations. The isotopic discrimination is indicative of the ratio between the CO2 partial pressure in the intercellular cavities and the atmosphere (ci∕ca) and of the ratio of assimilation to stomatal conductance, termed intrinsic water-use efficiency (iWUE). We performed isotope-enabled simulation
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Leavitt, Steven W., та Robert M. Kalin. "A New Tree-Ring Width, δ13C and 14C Investigation of the Two Creeks Site". Radiocarbon 34, № 3 (1992): 792–97. http://dx.doi.org/10.1017/s0033822200064092.

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We have made isotopic and dendrochronologic measurements on material collected from the Two Creeks site. Radiocarbon dating of outside wood of four logs yielded an average age of 11,760 ± 100 BP, in good agreement with results of Broecker and Farrand (1963) over 25 years ago. The range of 11,640 ± 160 to 11,900 ± 160 BP suggests a period of forest growth of 200–300 years, consistent with a ring-width chronology established by Kaiser (1987). Ring counting of five specimens gave a range of individual tree ages from 110 to 182 years, and width measurements indicate very low year-to-year variation
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Dickinson, Dane, Samuel Bodé та Pascal Boeckx. "System for <i>δ</i><sup>13</sup>C–CO<sub>2</sub> and <i>x</i>CO<sub>2</sub> analysis of discrete gas samples by cavity ring-down spectroscopy". Atmospheric Measurement Techniques 10, № 11 (2017): 4507–19. http://dx.doi.org/10.5194/amt-10-4507-2017.

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Abstract. A method was devised for analysing small discrete gas samples (50 mL syringe) by cavity ring-down spectroscopy (CRDS). Measurements were accomplished by inletting 50 mL syringed samples into an isotopic-CO2 CRDS analyser (Picarro G2131-i) between baseline readings of a reference air standard, which produced sharp peaks in the CRDS data feed. A custom software script was developed to manage the measurement process and aggregate sample data in real time. The method was successfully tested with CO2 mole fractions (xCO2) ranging from &lt; 0.1 to &gt; 20 000 ppm and δ13C–CO2 values from −
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Bownes, Jessica M., Philippa L. Ascough, Gordon T. Cook, Iona Murray, and Clive Bonsall. "Using Stable Isotopes and a Bayesian Mixing Model (FRUITS) to Investigate Diet at the Early Neolithic Site of Carding Mill Bay, Scotland." Radiocarbon 59, no. 5 (2017): 1275–94. http://dx.doi.org/10.1017/rdc.2017.39.

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AbstractWe present δ13C, δ15N, and δ34S measurements on archaeological human and animal bone collagen samples from a shell midden dating to the Neolithic ca. 4000–3500 cal BC, together with measurements on modern fish and shellfish. These data were used in conjunction with the Bayesian mixing model, Food Reconstruction Using Isotopic Transferred Signals (FRUITS), to reconstruct human diet at the site. We demonstrate the importance of using a geographically appropriate faunal baseline in stable isotope paleodietary studies, and suggest that Neolithic individuals at this site consumed up to ca.
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Sangster, D. F., P. M. Outridge, and W. J. Davis. "Stable lead isotope characteristics of lead ore deposits of environmental significance." Environmental Reviews 8, no. 2 (2000): 115–47. http://dx.doi.org/10.1139/a00-008.

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Stable Pb isotopes are increasingly used in environmental science as tracers of natural and anthropogenic Pb sources. This review provides a summary of the recent geological literature concerning Pb isotopes in global Pb ore deposits. The isotopic characteristics of 151 Pb deposits, including 78 20th-century producing mines, have been summarized using the 204Pb-based ratios common to geological science and the 206Pb- and 207Pb-based ratios (i.e., excluding 204Pb) more often employed in environmental studies. A number of current mines, including those exploiting several Australian, Scandinavian
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Liu, Yi, Chaoyu Zhang, Jiyi Jiang, et al. "Interaction between Groundwater and Surface Water in the Qujiang River Basin in China: Evidence from Chemical Isotope Measurements." Water 15, no. 22 (2023): 3932. http://dx.doi.org/10.3390/w15223932.

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The Qujiang River Basin is a significant water system located in Zhejiang Province, China, that serves as a primary water source for Quzhou City. For this research, we collected and examined water samples from the Qujiang River Basin. In this study, we collected and analyzed water samples from the Qujiang River Basin and employed a combination of methods, including water balance analysis; Piper trilinear diagram; Gibbs diagram; and environmental tracer techniques, such as hydrochemical and isotopic analysis. These techniques helped us to analyze the spatial distribution patterns and evolutiona
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Dissertations / Theses on the topic "Ca isotopic measurements"

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Mondal, Surajit. "Assessing the potential of stable calcium isotope ratios for paleotemperature reconstruction from studies of laboratory-precipitated inorganic carbonates and modern corals, fish otoliths and foraminifera." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4661.

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Determining paleo-seawater composition and temperature is critical for reconstructing Earth’s surface conditions through time and has major implications for understanding the origin and evolution of life on Earth. Paleo-seawater composition is inferred from the chemical and iso-topic compositions of biogenic and inorganic chemical precipitates that form out of seawater. Some of the widely used geochemical and isotopic tracers that have been measured in marine carbonates for determining the physical and chemical attributes (e.g., temperature, pH, salinity) of the past oceans include Sr/Ca, Mg/C
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Books on the topic "Ca isotopic measurements"

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M, Imamura, and United States. National Aeronautics and Space Administration., eds. Measurements of proton-induced production cross sections for ³⁶Cl from Ca and K. National Aeronautics and Space Administration, 1998.

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Book chapters on the topic "Ca isotopic measurements"

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Leavitt, Steven W., and John Roden. "Isotope Dendrochronology: Historical Perspective." In Stable Isotopes in Tree Rings. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92698-4_1.

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AbstractAlthough the fields of dendrochronology and light stable-isotope mass spectrometry emerged at different times in the first half of the 20th Century, their convergence with the earliest measurements of isotope composition of tree rings is now ca. 70 years old. Much of the early stable isotope analysis (including on wood) explored natural variation of isotopes in the environment, but those researchers making the measurements were already contemplating the role of the isotope composition of the source substrates (e.g., water and CO2), biochemical fractionation, and environment as contribu
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Cernusak, Lucas A., and Nerea Ubierna. "Carbon Isotope Effects in Relation to CO2 Assimilation by Tree Canopies." In Stable Isotopes in Tree Rings. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92698-4_9.

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AbstractThe carbon atoms deposited in tree rings originate from the CO2 in the atmosphere to which the tree’s canopy is exposed. Thus, the first control on the stable carbon-isotope composition of tree rings is by δ13C of atmospheric CO2. There has been an inter-annual trend of decreasing δ13C of atmospheric CO2 over the past two centuries as a result of combustion of fossil fuels and land-use change. Atmospheric CO2 is, for the most part, well mixed, but the sub-canopy air space can become depleted in 13C due to inputs from soil and plant respiration when turbulent exchange with the troposphe
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Criss, Robert E. "Isotope Hydrology." In Principles of Stable Isotope Distribution. Oxford University Press, 1999. http://dx.doi.org/10.1093/oso/9780195117752.003.0005.

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No substance exemplifies the principles of isotope distribution better than water. Water is practically ubiquitous at the Earth’s surface, where it undergoes phase transitions, interacts with minerals and the atmosphere, and participates in complex metabolic processes essential to life. The isotopes of hydrogen and oxygen undergo large fractionations during these processes, providing a multiple isotopic tracer record of diverse phenomena. In the hydrologic cycle, hydrogen and oxygen isotope ratios provide conservative tracers, uniquely intrinsic to the water molecule, that elucidate the origin
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Koehler, Héloïse, Fabio Wegmüller, Benjamin Audiard, et al. "The Middle Paleolithic Occupations of Mutzig-Rain (Alsace, France)." In Tübingen Publications in Prehistory. Kerns Verlag, 2021. http://dx.doi.org/10.51315/9783935751353.006.

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The Paleolithic site of Mutzig, discovered by chance in 1992 (Sainty 1992), has been the focus of several excavations since 2009. Located in Alsace (Bas-Rhin, France), it is presently one of only a handful of sites reliably attributed to the Middle Paleolithic in this area, thus providing rare evidence for a zone still relatively unknown for Early Prehistoric remains. The excellent preservation of the remains and the long stratigraphic sequence, with 6 to 8 in situ archaeological levels, make Mutzig a potential reference site for environmental and behavioral analyses for the Middle Paleolithic
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"A 68Ga-isotope /Gd-atom labeled PET/MR imaging probe for pH assessment." In Book of Abstracts - RAD 2025 Conference. RAD Centre, Niš, Serbia, 2025. https://doi.org/10.21175/rad.abstr.book.2025.20.1.

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A novel hybrid probe for pH reporting using PET and MRI was prepared that harnesses the complementary properties of both imaging techniques. Here, we utilize PET to quantify the concentration of the probe with very high sensitivity, while simultaneously obtaining pH-related relaxivity information from MRI at higher spatial resolution. Both techniques supply essential information for surgeons, facilitating more precise removal of malignant tissues, because extracellular pH values change on the tumor edge from acidic to neutral are detectable at the submillimetric range. A biotinylated conjugate
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Conference papers on the topic "Ca isotopic measurements"

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Haldar, Utpalendu, Roberta L. Rudnick, and Ramananda Chakrabarti. "The evolution of K/Ca in the upper continental crust constrained from Ca isotopic measurements of glacial diamictites." In Goldschmidt2022. European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.9038.

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Hashimoto, Y., K. Minamino, D. Nagamoto, S. Hasegawa, Tetuso Iguchi, and Kenichi Watanabe. "Measurement of isotope ratio of Ca[sup +] ions in a linear Paul Trap." In 4TH INTERNATIONAL CONFERENCE ON LASER PROBING—LAP 2008. AIP, 2009. http://dx.doi.org/10.1063/1.3115607.

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Tong, William G., Ken Weed, and Zhiqiang Wu. "Doppler-free nonlinear laser spectroscopy for isotope analysis and hyperfine structure measurement." In OSA Annual Meeting. Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.mkk5.

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Hyperfine structure measurement by a high-resolution laser spectroscopic method based on optical phase conjugation by nonlinear wave mixing is presented by using different atomizers, including analytical flames and low-pressure dc discharge plasmas. Isotope solutions can be conveniently introduced to a flame atomizer such as an air-acetylene flame. When a demountable discharge plasma atomizer (1–10 Torr) is used, pressure broadening is also minimized and Doppler broadening is cancelled. Unlike many other nonlinear methods, these Doppler-free nonlinear wave mixing methods (e.g., degenerate four
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Jacobsen, Stein, Christopher Parendo, Zachary Eriksen, Hairuo Fu, and Yvan Gérard. "The Nu Sapphire SP001 collision cell MC-ICP mass spectrometer: Application to high-precision measurements of K and Ca isotopes." In Goldschmidt2023. European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.20550.

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Netto, Paulo R. A., and Manuel Pozo. "Use of Spectral Gamma Ray and Lithogeochemical Logs Combined With XRD Data to Identify Mg-Clay Mineral Sequences in Barra Velha Formation (BVE) – Lower Cretaceous of the Santos Basin." In 2024 SPWLA 65th Annual Symposium. Society of Petrophysicists and Well Log Analysts, 2024. https://doi.org/10.30632/spwla-2024-0022.

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Natural radioactivity in rocks is usually the result of the presence of natural isotopes: potassium – 40K, uranium – 238U, 234U, 235U, and thorium – 232Th and their decay products. Initially contained in acid igneous rocks, these isotopes are released through weathering processes and subsequently transported to sedimentary sites, where they primarily accumulate by adsorption onto clay mineral particles. Direct measurements of potassium, uranium, and thorium activity in sedimentary rocks provide crucial insights into their geochemistry and mineral content. Methods proposed the use of gamma ray
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