Results 91 to 100 of about 25,230 (195)

Assimilation of upper plate rocks at convergent margins contributes to the low δ18O isotopic signature of erupted magma

Communications Earth & Environment
Oceanic arc and back-arc magmas are typically sourced from mantle metasomatized by subducted slab fluids/melts, but the role of the overriding plate is often ignored.
Xiaohui Li, Zixuan Zhang, Sanzhong Li, Robert J. Stern, Osamu Ishizuka, Huixin Yang, Yanhui Suo, Long Chen, Zhiqing Lai, Yuan Zhong, Jun Hu, Liangliang Wang, Liming Dai, Quanshu Yan, Qiuli Li   +14 more
doaj   +1 more source

Metamorphic or Igneous Zircon? Classification Through Rare Earth Elements, Machine Learning and Logistic Regression

Journal of Metamorphic Geology, EarlyView.
ABSTRACT Zircon is a common, highly refractory accessory mineral found in sedimentary, igneous and metamorphic rocks that forms through various processes (e.g., magmatic, hydrothermal, metamorphic growth and recrystallization). Trace element compositions of detrital zircon have been widely applied to understanding tectonic processes and continental ...
Jarrod M. Burges, Chris Yakymchuk, Michael P. DiMaio, Timothy C. C. Lui, Anirudh Prabhu, Shaunna M. Morrison   +5 more
wiley   +1 more source

Seasonally resolved δ18O from Pennsylvanian mollusk aragonite [PDF]

, 2018
Use of the δ18O thermometer in deep time investigations is complicated by uncertainty in the oxygen isotopic composition of seawater and an increasing potential for diagenetic alteration with age.
Jimenez, Marie Yerill
core   +1 more source

Stable isotope (δD–δ18O) relationships of ice facies and glaciological structures within the mid-latitude maritime Fox Glacier, New Zealand

Annals of Glaciology, 2017
Relationships between stable isotopes (δD–δ18O), ice facies and glacier structures have hitherto gone untested in the mid-latitude maritime glaciers of the Southern Hemisphere.
John R. Appleby, Martin S. Brook, Travis W. Horton, Ian C. Fuller, Katherine A. Holt, Duncan J. Quincey   +5 more
doaj   +1 more source

Feldspar Albitization With Implications for Reservoir Quality Evolution of Eocene Turbidite Sandstones in Offshore Espírito Santo Basin, Eastern Brazil

Journal of Petroleum Geology, EarlyView.
ABSTRACT The diagenetic albitization of plagioclase and K‐feldspar grains is a transformative process that significantly alters sandstone's detrital composition and formation water chemistry, impacting reservoir quality. In this study, Eocene turbidite sandstones from the offshore Espírito Santo Basin, Brazil, were investigated to elucidate the role of
Eveline E. Zambonato, Luiz F. De Ros, Howri Mansurbeg   +2 more
wiley   +1 more source

Improved primary production and gross respiration measurements using the H218O technique with membrane inlet mass spectrometry and introduction of a small volume–uniform irradiance incubation chamber

Journal of Phycology, EarlyView.
Abstract An improvement in the H218O technique for phytoplankton gross primary productivity (GPP), net primary productivity (NPP), and gross respiration (GR) is described that reduces cost, labor, and time over the traditional isotope ratio mass spectrometer (IRMS) method.
Bruna F. Sobrinho, Nayani K. Vidyarathna, Todd M. Kana, Patricia M. Glibert   +3 more
wiley   +1 more source

δ2H, δ18O, and δ13C behave differently when assessing transpirative and photosynthetic performance of wheat under contrasting VPD conditions

Crop Journal
Carbon (δ13C) and oxygen (δ18O) isotope compositions are considered indicators of the effect of water conditions on plant photosynthesis (δ13C) and transpiration (δ18O).
Fatima Zahra Rezzouk, Maria Dolors Serret, José Luis Araus, Rut Sanchez Bragado   +3 more
doaj   +1 more source

Negative correlation between altitudes and oxygen isotope ratios of seeds: exploring its applicability to assess vertical seed dispersal

Ecology and Evolution, 2016
Vertical seed dispersal, which plays a key role in plant escape and/or expansion under climate change, was recently evaluated for the first time using negative correlation between altitudes and oxygen isotope ratio of seeds.
Shoji Naoe, Ichiro Tayasu, Takashi Masaki, Shinsuke Koike   +3 more
doaj   +1 more source

Solar cycles in the last centuries in 10Be and δ18O in polar ice and in thermoluminescence signals of a sea sediment [PDF]

, 1984
The cyclogram method of time series analysis has been used to analyse 10Be data (1181–1800 AD) and δ18O data (1181–1960 AD) from an artic ice core and thermoluminescence data (1181–1960 AD) from a Mediterranean sediment core.
Galli, M., Bonino, G., Cini Castagnoli, G., Attolini, M. R., Beer, J.   +4 more
core   +2 more sources

Forest under stress: responses and recovery of water relations across scales during the compound drought in summer 2022

New Phytologist, EarlyView.
A schematic showing the links of tree‐scale (root‐, stem‐, and leaf‐level) and ecosystem‐scale water relations during the CSAD at CH‐Lae. Summary The summer of 2022 was characterized by compound soil and atmospheric drought (CSAD; low soil water content, SWC, and high vapor pressure deficit, VPD) in Central Europe, threatening forest carbon ...
Ankit Shekhar, Anna K. Gilgen, Annika Ackermann, Liliana Scapucci, Sergio Aranda‐Barranco, Anastasiia Bolshakova, Lukas Hörtnagl, Yi Wang, Franziska Richter, Fabio Turco, Ruikun Gou, Luana Krebs, Iris Feigenwinter, Roland A. Werner, Roman Zweifel, Sophia Etzold, Marius Floriancic, Stefan Osterwalder, Mana Gharun, Nina Buchmann   +19 more
wiley   +1 more source