Sub-Antartic glacier extensions in the Kerguelen region (49°S), Indian Ocean) over the past 24 000 years constrained by 36CL moraine dating

Abstract : Similar to many other regions in the world, glaciers in the southern sub-polar regions are currently retreating. In the Kerguelen Islands (49°S, 69°E), the mass balance of the Cook Ice Cap (CIC), the largest ice cap in the region, experimented dramatic shrinking between 1960 and 2013 with retreat rates among the highest in the world. This observation needs to be evaluated in a long-term context. However, data on the past glacier extents are sparse in the sub-Antartic regions. To investigate the deglaciation pattern since the Last Glacial Maximum (LGM) period, we present the first 13 cosmogenic 36Cl surface exposure ages from four sites in the Kerguelen Islands. The 36Cl ages from erratic and moraine boulders span from 24.4±2.7 ka to 0.3±0.1 ka. We combined these ages with extisting glacio-marine radiocarbon ages and bathymetric data to document the temporal and spatial changes of the island's glacial history. Ice began to retreat on the main island before 24.4±2.7 ka until around the time of the Antartic Cold Reversal (ACR) period (-14.5-12.9 ka), during which the Bontemps moraine was formed by the advance of a CIC outlet glacier. Deglacication continued during the Holocene probably until 3 ka with evidence of miror advances during the last millennium. This chronology is in pace with majeor changes in the ᵟ18O in a recent West Antartica ice core record, showing that Kerguelen Islands glaciers are particularly sensitive and relevant to document climate change in the southern polar regions.
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Vincent Jomelli, Fatima Mokadem, Irene Schimmelpfennig, Emmanuel Chapron, Vincent Rinterknecht, et al.. Sub-Antartic glacier extensions in the Kerguelen region (49°S), Indian Ocean) over the past 24 000 years constrained by 36CL moraine dating. Quaternary Science Reviews, Elsevier, 2017, 162, pp.128-144. ⟨10.1016/j.quascirev.2017.03.010⟩. ⟨hal-02003992⟩

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