Results 21 to 30 of about 25,230 (195)

Origins of high δ18O in 3.7–3.6 Ga crust: A zircon and garnet record in Isua clastic metasedimentary rocks [PDF]

, 2020
Elevated δ18O is used as a marker for the presence of continents and surficial alteration in the Eoarchean and Hadean. This study establishes a timeline for δ18O enrichment in Eoarchean metasedimentary rocks of the Isua supracrustal belt in Greenland ...
Gauthiez Putallaz, Laure, Bennett, Vickie, Rubatto, Daniela, Nutman, Allen   +3 more
core   +3 more sources

Interpretation of stalagmite δ18O in East Asian summer monsoon region: Based on the relationship between summer monsoon and summer monsoon rainfall

地质科技通报, 2022
The climate significance of stalagmite δ18O values from the East Asian monsoon region are still under much debated during the past years. The bone of contention focuses on whether the stalagmite δ18O can reflect the summer monsoon intensity or summer ...
Jianjun Yin
doaj   +1 more source

Spatiotemporal Variation of Hydrogen and Oxygen Stable Isotopes in the Yarlung Tsangpo River Basin, Southern Tibetan Plateau

Frontiers in Earth Science, 2021
Characterization of spatiotemporal variation of the stable isotopes δ18O and δD in surface water is essential to trace the water cycle, indicate moisture sources, and reconstruct paleoaltimetry.
Ya-Ni Yan, Jun-Wen Zhang, Wei Zhang, Gui-Shan Zhang, Jian-Yang Guo, Dong Zhang, Jie Wu, Zhi-Qi Zhao   +7 more
doaj   +1 more source

A novel salinity proxy based on Na incorporation into foraminiferal calcite [PDF]

, 2013
Salinity and temperature determine seawater density, and differences in both thereby control global thermohaline circulation. Whereas numerous proxies have been calibrated and applied to reconstruct temperature, a direct and independent proxy for ...
Reichart, G.J., Nooijer, L.J. de, Wit, Johannes C., Reichart, G.-J., Wit, JC, G. J. Reichart, de Nooijer, LJ, Wit, J.C., Reichart, GJ, L. J. de Nooijer, Wolthers, M., de Nooijer, Lennart, de Nooijer, L.J., Reichart, Gert-Jan, J. C. Wit, Wolthers, MVH, M. Wolthers   +16 more
core   +3 more sources

Isotopes of oxygen-18 and deuterium in precipitation in Slovakia / Izotopy kyslíka-18 A deutéria v zrážkach na Slovensku

Journal of Hydrology and Hydromechanics, 2012
Príspevok syntetizuje dostupné údaje o izotopickom zložení zrážok na území Slovenska (Západné Karpaty). Hodnotí koreláciu hodnôt δ18O v kumulatívnych mesačných zrážkach z rokov 1988-1997 medzi jednotlivými stanicami, vplyv nadmorskej výšky, teploty ...
Holko Ladislav, Dóša Michal, Michalko Juraj, Šanda Martin   +3 more
doaj   +1 more source

The origin of high δ18O zircons: marbles, megacrysts, and metamorphism [PDF]

, 2011
The oxygen isotope ratios (δ18O) of most igneous zircons range from 5 to 8‰, with 99% of published values from 1345 rocks below 10‰. Metamorphic zircons from quartzite, metapelite, metabasite, and eclogite record δ18O values from 5 to 17‰, with 99% below
J. Valley (23314189), Aaron Cavosie (23430391), T. Ushikubo (17553102), M. Spicuzza (23335414), Simon Wilde (7005155), N. Kita (23317711)   +5 more
core   +2 more sources

Modulated orbital cycles in planktonic foraminifera δ18O

, 2021
Measurements of δ18O on planktonic foraminifera represent an important geological archive. In the study of climate change on orbital time-scales, δ18O is used either as a proxy for temperature change, to construct age models through pattern matching, to ...
Roche, Didier; id_orcid, Metcalfe, Brett; id_orcid, de Haas, Auk, Bakker, Pepijn; id_orcid   +3 more
core   +1 more source

Stalagmite evidence for East Asian winter monsoon variability and 18O-depleted surface water in the Japan Sea during the last glacial period

Progress in Earth and Planetary Science, 2021
In the East Asian monsoon area, stalagmites generally record lower and higher oxygen isotope (δ18O) levels during warm humid interglacial and cold dry glacial periods, respectively.
Shota Amekawa, Kenji Kashiwagi, Masako Hori, Tomomi Sone, Hirokazu Kato, Tomoyo Okumura, Tsai-Luen Yu, Chuan-Chou Shen, Akihiro Kano   +8 more
doaj   +1 more source

Interpretation of Oxygen Isotopes in Phanerozoic Ophiolites and Sedimentary Rocks

Geochemistry, Geophysics, Geosystems, 2020
Two reactive transport models were developed to integrally simulate fluxes of oxygen isotopes from hydrothermal alteration of oceanic crust and weathering of continental rocks for a better understanding of the regulation of oxygen isotopes in the ocean ...
Yoshiki Kanzaki
doaj   +1 more source

Oxygen Isotope Equilibrium of the Shallow-Water Benthic Foraminifer Hanzawaia nipponica Asano in Tosa Bay, Southwest Japan

Frontiers in Earth Science, 2021
Oxygen isotopic compositions (δ18O) of benthic foraminifer tests are widely used for reconstructing paleoceanographic changes, such as global ice volumes during glacial–interglacial cycles.
Minoru Ikehara, Minoru Ikehara, Shigetaka Kita, Shungo Kawagata   +3 more
doaj   +1 more source