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whole-rock dating

A Dictionary of Earth Sciences | 1999 | | Â© A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

whole-rock dating Igneous and metamorphic rocks that contain no minerals but have particularly high Rb:Sr ratios (see RUBIDIUM-STRONTIUM DATING), or rocks that are too fine-grained for mineral separation, can be analysed as whole-rock samples. Whole-rock samples from different parts of the same body generally differ in rubidium content and the ⁸⁷Sr:⁸⁶Sr ratio of each can be plotted as a function of its ⁸⁷Rb: ⁸⁶Sr ratio in an isochron diagram. At the time of the initial crystallization different parts of the sample, regardless of rubidium concentration, would have had the same ⁸⁷Sr:⁸⁶Sr ratio and hence plot as a horizontal line. With the passage of time ⁸⁷Rb would be lost and corresponding amounts of radiogenic ⁸⁷Sr gained. As the ⁸⁷Sr:⁸⁶Sr ratio changes in each part of the rock, the slope of the isochron increases progressively, providing a measure of the age of the crystallization. The intercept of the isochron at the ordinate indicates the isotopic composition of common strontium at the beginning of the process.

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AILSA ALLABY and MICHAEL ALLABY. "whole-rock dating." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 27 Dec. 2009 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "whole-rock dating." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (December 27, 2009). http://www.encyclopedia.com/doc/1O13-wholerockdating.html

AILSA ALLABY and MICHAEL ALLABY. "whole-rock dating." A Dictionary of Earth Sciences. 1999. Retrieved December 27, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-wholerockdating.html

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