Results 101 to 110 of about 4,093 (226)

Present and past changes in continental weathering and ocean circulation from radiogenic Nd, Hf and Pb isotopes [PDF]

, 2018
The past and present variability of ocean circulation and weathering inputs can be reconstructed from the geochemical composition of seawater and marine sediments.
Dausmann, Veit
core  

Atmospheric dust is a global nutrient source for plants via foliar uptake

New Phytologist, Volume 250, Issue 5, Page 2867-2883, June 2026.
Summary Atmospheric mineral dust is a critical nutrient supplier to marine ecosystems, but its role in terrestrial plant nutrition remains underexplored due to the assumption that nutrients are acquired solely from soils via roots. Here, we demonstrate that plants directly acquire nutrients from dust through leaves, revealing an unrecognized ...
Anton Lokshin, Daniel Palchan, Marcelo Sternberg, Tom Goren, Mahdi (André) Nakhavali, Avner Gross   +5 more
wiley   +1 more source

Radon‐222 as an Effective Tracer to Distinguish Groundwater Circulation Patterns in the Deep Fault‐Controlled Geothermal System

Geophysical Research Letters, Volume 53, Issue 10, 28 May 2026.
Abstract Groundwater flow regulated by deep faults remains challenging to trace due to structural complexity. This study applies the noble gas tracer 222Rn combined with hydrochemistry and stable isotopes (δ2H, δ18O) to distinguish circulation patterns of geothermal springs along a major fault in the Tibetan Plateau.
Xiaoyan Shi, Xingxing Kuang, Meizhuang Zhu, Linfeng Fan, Xinkang Wang, Gexi Zheng, Yinlei Hao, Chunmiao Zheng   +7 more
wiley   +1 more source

Recent Development in Radiogenic Isotope Geology

Journal of Geography (Chigaku Zasshi), 1964
Several topics of the research in radiogenic isotope geology are briefly reviewed. This short review consists of four parts; (i) recent development in the instrumentation, (ii) in the methodology, (iii) topics on the mantle-crustal evolution on the basis of Pb, Sr isotope growth and (iv) geochronology of ocean floors.
openaire   +3 more sources

Differing Controls on the Cycling of Neodymium in the Atlantic and the Pacific

Geophysical Research Letters
Neodymium (Nd) isotopes ratios are regarded as a key proxy for past ocean circulation despite unsettled debate on marine Nd cycle controls, which opposes a “top‐down” hypothesis (surface sources dominate) and a “bottom‐up” hypothesis (sedimentary sources
Paige M. Wise, Benoît Pasquier, Seth G. John, Sophia K. V. Hines   +3 more
doaj   +1 more source

Mass Spectrometry in Earth Sciences: The Precise and Accurate Measurement of Time

CHIMIA, 2014
Precise determinations of the isotopic compositions of a variety of elements is a widely applied tool in Earth sciences. Isotope ratios are used to quantify rates of geological processes that occurred during the previous 4.5 billion years, and ...
Urs Schaltegger, Jörn-Frederik Wotzlaw, Maria Ovtcharova, Massimo Chiaradia, Richard Spikings   +4 more
doaj   +1 more source

Radiogenic Ca isotopes confirm post-formation K depletion of lower crust [PDF]

, 2019
Heat flow studies suggest that the lower crust has low concentrations of heat-producing elements. This could be due to either (i) greater fractions of basaltic rock at depth or (ii) metamorphic depletion of radioactive elements from rocks with more ...
Rubatto, Daniela, Antonelli, M. A., De Paolo, D. J., Grew, E. S., Chacko, T.   +4 more
core   +1 more source

A crustal Pb isotope map of southeastern Australia

Scientific Data
Lead isotopes are a powerful geochemical tracer and a popular tool applied across a broad range of scientific fields, e.g., earth sciences, archaeology, and forensic sciences.
J. Liebmann, B. Ware, D. R. Mole, C. L. Kirkland, G. Fraser, K. Waltenberg, S. Bodorkos, D. L. Huston, N. J. Evans, B. J. McDonald, K. Rankenburg, P. Datta, S. Tessalina   +12 more
doaj   +1 more source

Radioactive and radiogenic isotopes in sediments from Cooper Creek, Western Arnhem Land

, 2008
Protection of the environment post-mining is a key objective of rehabilitation, especially where runoff and erosion from rehabilitated mine sites could potentially lead to contamination of the surrounding land and watercourses.
Frostick, A., Parry, D., Munksgaard, N., Bollhöfer, A., Evans, K.   +4 more
core   +1 more source

A normalised seawater strontium isotope curve: possible implications for Neoproterozoic-Cambrian weathering rates and the further oxygenation of the Earth

, 2007
The strontium isotope composition of seawater is strongly influenced on geological time scales by changes in the rates of continental weathering relative to ocean crust alteration.
Shields, GA, Shields, G. A.
core