Abstract

The content of heavy metals in mineral waters differs according to the age of faults with which the occurrence of the mineral water is connected. As available data are scarce, the regularity has been investigated for two [European] regions in detail and found in agreement with the proposed hypothesis. The occurrence of ore deposits shows a similar, although not so clear, regularity. The reasons for this regularity are to be looked for, first in the more advanced erosion of the older strata thus exposing deeper parts of the faults, and second in the decrease of the geothermal gradient with time owing to the decrease of radioactive matter in the earth's crust.

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