Mathematics
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993e%26psl.120...77h&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 120, no. 1-2, p. 77-84
Mathematics
6
Chemical Composition, Israel, Mathematical Models, Rain, Strontium Isotopes, Dissolving, Mineralogy, Sodium Chlorides, Solubility
Scientific paper
Eighteen rain samples from Israel have been analyzed for their chemical composition and Sr-87/Sr-86 ratios. The Sr-isotopic ratios lie in the range 0.7078 and 0.7092, and the Sr concentrations vary from 1 x 10(exp -4) to 9 x 10(exp -4) meq Sr/l. Soluble salts in rainwater are inherited from three major natural sources, seaspray, Recent marine minerals and mineral dust eroded from rock outcrops and soil. A mixing model is formulated to apply the chemical composition of rain (Cl(-) and Sr(+)) and its isotopic Sr-87/Sr-86 ratio, for the identification and estimation of the Sr sources. All the samples fall within the mixing space predicted by the model for the three end members mentioned above. The data indicate that the most important non-seaspray source contributing dissolved salts to the rains in Israel comprises a mixture of Senonian to Eocene chalk (and its weathering products) and Recent marine minerals, from local and imported sources. Most of the samples (67%) contain 50% or more non-seaspray Sr (i.e., Sr dissolved from dust or Recent marine minerals), whereas 56% of the samples display Sr-87/Sr-86 ratios lower than 0.7090. The rest represent mixtures of seaspray and Recent marine minerals.
Herut Barak
Katz Amitai
Starinsky Avraham
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