Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published October 15, 1964 | Published
Journal Article Open

Migration of radiogenic strontium during metamorphism

Abstract

Study of the concentration and isotopic composition of strontium and rubidium in hornblende diorite dikes and sills of Precambrian age from the Panamint Mountains of California showed that these rock systems were enriched in radiogenic Sr during a late Mesozoic metamorphism. Enrichments in radiogenic Sr were observed for total-rock samples which yielded apparent ages of up to 34,000 m.y., although there is no obvious petrographic evidence for such metasomatic changes. These results indicate that some caution is necessary in interpreting the Sr isotopic composition of rocks in terms of their original source or in assuming that 'total rocks' form closed systems. In general, the initial isotopic Sr composition should be determined, not assumed.

Additional Information

Copyright 1964 by the American Geophysical Union. (Manuscript received April 20, 1964; revised July 2, 1964.) We would like to thank Mr. B. Troxel of the California Bureau of Mines for his very kind efforts in obtaining some samples of diabase. This work was supported by grants from the National Science Foundation and the Atomic Energy Commission. Contribution 1256, Division of Geological Sciences, California Institute of Technology, Pasadena.

Attached Files

Published - jgr3503.pdf

Files

jgr3503.pdf
Files (494.4 kB)
Name Size Download all
md5:042ecf9cc5cf684fe2563051f8c91f60
494.4 kB Preview Download

Additional details

Created:
August 22, 2023
Modified:
October 18, 2023