Climate variability along the south chilean margin since the Last Glacial Maximum : sedimentological study and new applications in tephrochronology
type: Dataset
description: The south-chilean margin is the one continental mass to intercept the entire Westerly Winds cell (SWW), closely linked to the oceanic circulation. It constitutes a strategic area for paleoclimatic reconstructions and represents a peculiar interest since the last decades. In the southern high latitude chilean margin setting, the main objectives of this thesis were focused on (1) the establishment of a precise chronology based on radiocarbon dates and tephrochronology and (2) to restore the north-Patagonian icefield dynamic strongly linked to the rainfall features, temperatures and/or internal glaciers dynamic over the last 22 ka BP from a High-resolution and High sedimentation rate deep-sea core collected offshore the Taitao peninsula (~46°S). Based on robust age model by radiocarbon dates and tephrochronology study, the marine record MD07-3088 allows a large time-span since the Last Glacial Maximum, the deglaciation and the Holocene. Several proxies (clay mineralogy, grain-size and inorganic geochemistry) were used to restore the variability in continental source inputs and north-patagonian icefield fluctuations. Coupled to SST estimations and palynological dataset, this study allows to reconstruct rainfall changes and interconnections between oceanic and atmospheric features. Results show that during the LGM (22-18 ka BP), the globally colder temperatures play a major role in the detrital supplies from Coastal Range and glacier dynamic. During the deglaciation (18-11,5 ka BP), warmer conditions mark a drastic change in the terrigenous source with a dominance of Andean Cordillera influence. This interval is punctuated by 3 colder events, in particularly the ACR event (14,3-12,7 ka BP) during which a renewed glacial activity is recorded as shown by the expansion of Magellanes moorlands, typical of colder and more humid climate as a result of the northward migration of the Westerly Winds. The Early Holocene (11,5-8 ka BP) is marked by climatic conditions similar to th…
landing page: https://theses.hal.science/tel-00856588
identifier: NNT: 2012PA112352
keyword: calotte-patagonienne
keyword: chile
keyword: chili
keyword: grain-size
keyword: granulometrie
keyword: hudson
keyword: infoeu-reposemanticsdoctoralthesis
keyword: mineralogie
keyword: mineralogy
keyword: patagonian-icecap
keyword: sdustusciences-of-the-universe-physicsearth-sciences
keyword: tephrochronologie
keyword: tephrochronology
keyword: theses
keyword: westerlies
issued: 2026-05-09T22:38:32.204423
modified: 2026-05-09T22:38:32.204428
language: fr
contact point: Organization
  fn: CCSD

test_moissonnage_selune
type: Agent

Climate variability along the south chilean margin since the Last Glacial Maximum : sedimentological study and new applications in tephrochronology
type: Distribution
format: HTML
access URL: https://theses.hal.science/tel-00856588
issued: 2026-05-09T22:38:32.206891
modified: 2026-05-09T22:38:32.191007