Host: Abstracts of Annual Meeting of the Geochemical Society of Japan
Name : Abstracts of Annual Meeting of the Geochemical Society of Japan
Number : 69
Date : September 05, 2022 - September 16, 2022
Pages 156-
The northern and southern Patagonian icefields, which are currently centered on the higher parts of the Andes, have been reported to accelerated retreat during the last decades. The behavior of glaciers during past warm periods, such as the last interglacial, provides an important suggestion to predict in the future, however, there are few reconstructions due to less geological record on land. Thus, we focused on deep-sea sedimentary records retrieved from off the Chilean margin, which were likely to be continuously supplied with terrigenous materials from Patagonia and to record the past melting history of these icefields. Here we use the three hemipelagic sediment cores: IODP Site U1543 (54°S; 76°W; ~3860 m water depth), MR16-09 PC04 (50°S; 79°W; 3848 m water depth), and PC03 (46°S; 77°W; 3082 m water depth). In this study, we show that the southern Patagonian icefield could had significantly retreated compared to the present during the last interglacial period based on the results of bulk elemental composition analysis by µXRF core scanner, mineral composition analysis by XRD, and grain size distribution of detritus.
