Mathematics – Logic
Scientific paper
Jan 1965
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965gecoa..29....1r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 29, Issue 1, pp.1-16
Mathematics
Logic
8
Scientific paper
Measurements have been made of the boron contents of Precambrian illites from relatively unmetamorphosed carbonate rocks. The samples range in age from upper Proterozoic to Archaean. The boron contents are similar to those reported elsewhere for normal-marine illites from post-Precambrian rocks. These data suggest that the boron concentration in sea water has been fairly constant for the past two to three billion years. The results support the view that the oceans have grown throughout geologic time by the accumulation of degassing products of the Earth's crust. The boron method for determining paleosalinities is reviewed, and its limitations are considered. The method is concluded to be valid subject to the following conditions: (1) individual paleosalinities may not be significant within a range of approximately 23 per cent because of uncertainties in the nominal K 2 O content for pure illite; (2) all samples studied should consist of clay fractions in which the illite is predominantly of the 1Md polymorph; and (3) the accurate determination of the amount of illite present, based on %K 2 O, requires that the data be corrected for the presence of K-feldspar.
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