engleski

Glaciochemical investigations of the ice deposit of Vukušić Ice Cave, Velebit Mountain, Croatia

The 3H activity and concentration of 23 metals and metalloids have been analysed on cave ice samples from the perennial subterranean cave ice deposit of Vukušić Ice Cave, Velebit Mt. The results of tritium measurements exclude the secular age of the upper 2.4 m of ice deposition and provide clear argumentation that the sampled ice sequence consists of post-1950 precipitation. Measured concentration of most of the analysed elements have largely surmounted to, whereas three metals (Cr, Cu, Pb) provided concentrations comparable to, reported concentrations from local precipitation or Alpine snow/firn/ice records. Principal component analysis helped to select three groups of elements. The Ca-Mg governed group (PC1) encompassed the bedrock related components ; hence the fluctuation of these elements might reflect the past intensities of the dissolution process of the adjacent epikarst. PC2, most characteristic elements are Na-Cr-Pb, preserved probably an atmospheric deposition signal. PC3 is governed by Al and Fe. This probably carries the distal, non-karstic crustal signal hence might be related to the past atmospheric circulation (i.e. wind direction and speed).

Vukušić Ice Cave ; ice deposit ; tritium ; elemental analyses

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