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. Partly coeval flowstones formed in fractured gneiss and schist were studiedto test the palaeoclimate significance of this new type of speleothem archiveon a decadal-to-millennial timescale. The samples encompass a few hundred toa few thousand years of the Late Glacial and the early Holocene. Thespeleothem fabric is primarily comprised of columnar fascicular optic calciteand acicular aragonite, both indicative of elevated Mg  ∕  Ca ratios in thegroundwater. Stable isotopes suggest that aragonite is more prone todisequilibrium isotope fractionation driven by evaporation and priorcalcite/aragonite precipitation than calcite. Changes in mineralogy aretherefore attributed to these two internal fracture processes rather than topalaeoclimate. Flowstones formed in the same fracture show similar δ18O changes on centennial scales, which broadly correspond toregional lacustrine δ18O records, suggesting that suchspeleothems may provide an opportunity to investigate past climate conditionsin non-karstic areas. The shortness of overlapping periods in flowstonegrowth and the complexity of in-aquifer processes, however, render theestablishment of a robust stacked δ18O record challenging.

Palaeoclimate significance of speleothems in crystalline rocks: a test case from the Late Glacial and early Holocene (Vinschgau, northern Italy)