DIFFERENT SOURCES CONTRIBUTING TO A BEACH SAND, SOUTHEASTERN BORNHOLM (DENMARK)

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ABSTRACT

An abnormal relationship between quartz roundness and grain size, and unusual K-feldspar accumulation in the medium sand fraction, quartz grains with overgrowths, and a differentiated heavy-mineral community made it possible to calculate quantitatively the contributions of four sources to a modern beach sand in southeastern Bornholm. The quartz grains with overgrowths were particularly sensitive to transport and clearly showed an increase in roundness away from their origin, the Balka Quartzite. This rock, due to its high resistance, contributed only about 1% to the beach sands.

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