Mathematics – Logic
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46.2537m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 46, Dec. 1982, p. 2537-2545. Research supported by the University of California
Mathematics
Logic
9
Calcium Isotopes, Geochronology, Mass Spectroscopy, Petrology, Potassium Isotopes, Radioactive Age Determination, Feldspars, Igneous Rocks, Metamorphic Rocks, Meteoritic Composition, Potassium 40
Scientific paper
New mass spectrometric techniques are used to reassess the capabilities of the K-40 to Ca-40 radioactive decay for yielding precise ages of various geological materials. A brief discussion of the principles underlying the system's use is presented as a preliminary, and the analytical procedures are described. To test the method, a mineral isochron has been obtained on a sample of Pikes Peak granite which has been shown to have concordant K-Ar, Rb-Sr, and U-Pb ages. Plagioclase, K-feldspar, biotite, and whole rock yield an age of 1041 + or 32 m.y., in agreement with previous age determinations. The initial Ca-40/Ca-42 indicates that assimilation of high K/Ca crust was insufficient to affect calcium isotopes. The results show that the K-Ca system can be used as a precise geochronometer for common felsic igneous and metamorphic rocks, and may prove applicable to sedimentary rocks containing authigenic K minerals.
Depaolo Donald J.
Marshall Brian D.
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