Surface exposure dating with cosmogenic nuclides

The youngest age acquired is significant as it supports previous evidence for mid Holocene volcanic activity in the PVF and constitutes the first noble gas cosmogenic surface exposure age obtained from a basaltic bomb.

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Im Vergleich zu anderen Methoden der Geochronologie, die eine absolute Altersbestimmung ermöglichen, wird mit Hilfe von quantitativ bestimmten Radionuklide die Zeit, die ein Gestein bzw.We use these tools to interpret 49 Be-10 and Al-26 surface exposure ages of erratic boulders on six last-glacial and late-glacial moraines at Lago Buenos Aires, Argentina (LBA; 71 degrees W, 46.5 degrees S).Seven of the 49 boulders are identified as anomalously young, and are interpreted to have been exhumed after moraine deposition.The use of same-sample ¹⁰Be, in situ ¹⁴C and ³⁶Cl allowed us to quantitatively show that these rock surfaces experienced simple constant exposure with ≤500 years of ice cover and ≤6 cm of erosion.In addition, the fact that samples inside and outside the Little Ice Age (LIA) ice extent yield indistinguishable ages reinforces the hypothesis that Grueben glacier reached comparable dimensions only briefly during the Holocene.

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