Physics – Space Physics
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979rvgsp..17..824b&link_type=abstract
Reviews of Geophysics and Space Physics, vol. 17, June 1979, p. 824-839.
Physics
Space Physics
1
Emission Spectra, Stellar Spectra, Variable Stars, Balmer Series, Radial Velocity, Stellar Magnitude, T Tauri Stars
Scientific paper
Research activity during the four-year period 1975-1978 in the fields of geochronology and radiogenic isotopes has been quite effective. The paper reviews progress in areas supposed to be the most exciting and which represent the greatest advances in earth science through application of isotopic studies. Much of the paper is devoted to the development of the Sm-Nd system and to the discovery of long-term heterogeneity in the mantle. Other topics discussed include the new decay constant conventions, the application of Sr and Pb isotopes to the understanding of continental and continent-marginal igneous activity, advances in technique in U-Pb geochronometry in zircons, the discovery of rocks with ages close to 3.7 b.y. and isotopic constraints on the evolution of the crust, and progress in extraterrestrial chronology.
Bickford M. E.
van Schmus Randall W.
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