Chilean Margin 30Kyr Sediment Provenance Geochemical Data Muratli, J.M.; Chase, Z.; McManus, J.F.; Mix, A.C. Muratli, J.M. Chase, Z. McManus, J.F. Mix, A.C. earth science/paleoclimate/paleoceanography (titanium,sediment,null,parts per million,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (iron,sediment,null,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (magnesium,sediment,null,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (titanium,sediment,unspecified margin of error,parts per million,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (magnesium,sediment,unspecified margin of error,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth at sample start,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (iron,sediment,unspecified margin of error,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth at sample end,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (aluminum,sediment,null,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (aluminum,sediment,unspecified margin of error,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean (ODP 1233>LATITUDE -41>LONGITUDE -74.45) (ODP1235>LATITUDE -36.159833>LONGITUDE -73.56633) (ODP1234>LATITUDE -36.219167>LONGITUDE -73.68167) Bulk sediment chemistry from three Chilean continental margin Ocean Drilling Program sites constrains regional continental erosion over the past 30,000 years. Sediments from thirteen rivers that drain the (mostly igneous) Andes and the (mostly metamorphic) Coast Range, along with existing rock chemistry datasets, define terrestrial provenance for the continental margin sediments. Andean river sediments have high Mg/Al relative to Coast-Range river sediments. Near 36°S, marine sediments have high-Mg/Al (i.e. more Andean) sources during the last glacial period, and lower-Mg/Al (less Andean) sources during the Holocene. Near 41°S a Ti-rich source, likely from coast-range igneous intrusions, is prevalent during Holocene time, whereas high-Mg/Al Andean sources are more prevalent during the last glacial period. We infer that there is a dominant ice-sheet control of sediment sources. At 36°S, Andean-sourced sediment decreased as Andean mountain glaciers retreated after ~17.6 ka, coincident with local oceanic warming and southward retreat of the Patagonian Forest and, by inference, westerly winds. At 41°S Andean sediment dominance peaks and then rapidly declines at ~19 ka, coincident with local oceanic warming and the earliest deglacial sea-level rise. We hypothesize that this decreased flux of Andean material in the south is related to rapid retreat of the marine-based portion of the Patagonian Ice Sheet in response to global sea-level rise, as the resulting flooding of the southern portion of the Central Valley created a sink for Andean sediments in this region. Reversal of the decreasing deglacial Mg/Al trend at 41°S from 14.5 to 13.0 ka is consistent with a brief re-advance of the Patagonian ice sheet coincident with the Antarctic Cold Reversal. STUDY NOTES: Geochemical data (bulk sediment Al, Fe, Mg, and Ti) from 3 cores along the Chilean continental margin, interpreted for sediment provenance (Andean vs. Coast Range) over the past 30,000 years. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Muratli, J.M. Investigator : Chase, Z. Investigator : McManus, J.F. Investigator : Mix, A.C. 2010-12-30 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/10334 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/muratli2010b/muratli2010b.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/muratli2010b/muratli2010b.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/muratli2010b/muratli2010b.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/muratli2010b/muratli2010b.xls English https://www.ncdc.noaa.gov/paleo/study/10334 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/muratli2010b/muratli2010b.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/muratli2010b/muratli2010b.xls Muratli, J.M., Z. Chase, J. McManus, and A. Mix. 2010. Ice-sheet control of continental erosion in central and southern Chile (36°-41°S) over the last 30,000 years. Quaternary Science Reviews, Vol. 29, Issues 23-24, pp. 3230-3239, November 2010. doi:10.1016/j.quascirev.2010.06.037 START YEAR: 30185 cal yr BP * END YEAR: 155 cal yr BP -74.45 -41 -73.56633 -36.159833