This article was accepted into the corpus but its outbound wikilinks were never NER-processed — typical at the deepest BFS hop or when the run's entity cap was reached. No expansion funnel to show.
| Neodymium-143/Neodymium-144 | |
|---|---|
| Name | Neodymium-143/Neodymium-144 |
| Element | Neodymium |
| Atomic number | 60 |
| Mass numbers | 143, 144 |
| Parent isotopes | Samarium-147 |
| Used for | Geochronology, mantle-crust differentiation |
Neodymium-143/Neodymium-144
Neodymium-143/Neodymium-144 is an isotopic ratio widely used in geochronology and cosmochemistry to trace radiogenic processes, mantle-crust differentiation, and planetary evolution. Researchers employ the ratio in studies involving Alfred Wegener, Arthur Holmes, James Hutton, Marie Tharp, and laboratories such as Lamont–Doherty Earth Observatory and United States Geological Survey to interpret time-integrated parent/daughter element behavior. The ratio integrates isotopic data with models developed at institutions like California Institute of Technology, Massachusetts Institute of Technology, and University of Cambridge to resolve silicate differentiation in contexts spanning from Moon samples to terrestrial Mid-Atlantic Ridge basalts.
The 143/144 ratio compares the radiogenic isotope 143Nd, produced by decay of Samarium-147, to the non-radiogenic stable isotope 144Nd, serving as a reference in many isotopic systems used by groups at Smithsonian Institution, Max Planck Society, and ETH Zurich. Measurement of this ratio informs interpretations alongside complementary isotopic systems pioneered by scientists at Scripps Institution of Oceanography and Royal Society-supported programs. Laboratories such as Oak Ridge National Laboratory and Lawrence Livermore National Laboratory maintain protocols for sample preparation linking results to community standards from International Union of Geological Sciences meetings and interlaboratory comparisons coordinated by Geological Society of America.
High-precision determination of 143Nd/144Nd employs techniques developed at facilities including Argonne National Laboratory, Brookhaven National Laboratory, and university clean labs at Harvard University, often using multicollector Thermo Fisher Scientific instruments for mass bias correction. Chemical separation workflows draw on reagents and resin protocols standardized in workshops at European Geosciences Union conferences and executed under quality assurance frameworks from International Atomic Energy Agency. Data reduction integrates normalization strategies implemented by teams affiliated with NASA petrology groups, European Space Agency sample analyses, and cross-checked against reference materials maintained by National Institute of Standards and Technology.
The 143Nd/144Nd ratio is applied to problems addressed by researchers at Carnegie Institution for Science, California Academy of Sciences, and Smithsonian Astrophysical Observatory, including crustal growth models associated with studies on the Himalayas, Greenland, and Canadian Shield. Cosmochemical investigations conducted by consortia involving Jet Propulsion Laboratory, Lunar and Planetary Institute, and Institute of Geochemistry, Chinese Academy of Sciences use the ratio to compare terrestrial reservoirs with samples from Martian meteorites, Lunar meteorites, and chondrites. Studies of mantle plume sources related to Hawaii and mid-ocean ridge basalts attributed to work at Woods Hole Oceanographic Institution integrate 143Nd/144Nd with trace-element systematics produced in collaborations with Smithsonian National Museum of Natural History.
Radiogenic 143Nd arises from beta decay of 147Sm, a decay scheme characterized and calibrated through experiments at University of Oxford, University of Tokyo, and University of California, Berkeley. The Sm–Nd decay system has been incorporated into chronologies developed by teams at Geological Survey of Canada and the British Geological Survey to constrain ages of metamorphism studied in the Appalachians and Alps. Interpretations of isotopic evolution rely on theoretical frameworks advanced in seminars at Princeton University and Yale University and on isotope geochemistry textbooks used in courses at University of Chicago.
Reference standards for 143Nd/144Nd measurements derive from international intercomparisons coordinated by committees including representatives from International Association of GeoChemistry and laboratories such as NERC Isotope Geosciences Facility, with calibration strategies disseminated through meetings at American Geophysical Union and Royal Astronomical Society. Matrix-matched standards, procedural blanks, and spike calibration protocols referenced by groups at Pacific Northwest National Laboratory and Central Research Institute of Electric Power Industry ensure traceability of results used in publications from Nature-affiliated research teams and in datasets archived at PANGAEA.
Notable case studies using 143Nd/144Nd include mantle differentiation work on Iceland and Galápagos by collaborative networks involving University of Iceland and University of Cambridge researchers, crustal evolution reconstructions for the Zambia Craton and Kaapvaal Craton published by teams at University of the Witwatersrand and Curtin University, and planetary comparisons in studies by Caltech and Brown University that examined differences between Earth and Moon reservoirs. Integrated studies pairing 143Nd/144Nd with systems investigated at Los Alamos National Laboratory and Swiss Federal Institute of Technology Lausanne have been central to debates that appeared in journals associated with Royal Society Publishing and collections curated by Smithsonian Institution Libraries.