EarthRef.org Reference Database (ERR) -- Hart 1969

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Hart 1969

Hart, S.R. (1969). K, Rb, Cs contents and K/Rb, K/Cs ratios of fresh and altered submarine basalts. Earth and Planetary Science Letters 6(4): 295-303.

High K/Rb and K/Cs ratios appear to be a primary feature of submarine tholeiite magmas, though the trend of decreasing K/Rb with increasing K content is shown to be a probable result of later alteration, both during low grade metamorphism and during exchange with sea water. Sea water exchange results in enrichments of K, Rb, and Cs of 2, 5 and 20 times, respectively, in outer altered margins of submarine basalt fragments. Eight relatively unaltered samples give an average K/Rb of 940, and this ratio shows little significant trend over K contents ranging from 430-4500 ppm. The average Cs content of these unaltered samples is 0.024 ppm and the average K/Cs ratio is 70,000. Averages for K and Rb contents are 1550 ppm and 1.8 ppm, respectively.

BACKGROUND DATA FILES

	Abstract

	A-Sample Descriptions
	B-Experimental Details

	Table 1
	Table 2
	Table 3

	Analytical Methods

Keywords
alteration; basalts; chemical composition; chemical ratios;, igneous rocks; marine environment; metamorphism; petrology; sea, water; submarine environment; volcanic rocks, 05, Igneous and metamorphic petrology

Journal
Earth and Planetary Science Letters
http://www.elsevier.com/wps/product/cws_home/503328

Publisher
Elsevier Science
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The Netherlands
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