K, Rb, Cs and Sr relationships in submarine basalts from the Puerto Rico trench

Details K, Rb, Cs and Sr relationships in submarine basalts from the Puerto Rico trench K, Rb, Cs and Sr relationships in submarine basalts from the Puerto Rico trench

Feb 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970gecoa..34..145h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 34, Issue 2, pp.145-155

Physics

12

Scientific paper

Basalts dredged from a restricted region on the north wall of the Puerto Rico trench show a wide range in K (620-5600 ppm), K / Rb (430-2030), K / Cs (4560/81,000) and K / Sr (6.8-35.7). There is a positive correlation between K, K / Rb , K / Cs , K / Sr , Sr and SiO 2 . Deuteric or sea water alteration of these basalts is suggested by high H 2 O + contents and Fe 2 O 3 / FeO ratios. If Sr 87 / Sr 86 ratios as high as 0.706 are taken as evidence of sea water alteration, then it follows that such alteration processes may produce the observed positive trends of K / Rb and K / Cs versus K content. The extreme freshness required for meaningful trace element analysis or K-Ar dating of submarine basalts is emphasized by these results.

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