noaa-ocean-10334
Chilean Margin 30Kyr Sediment Provenance Geochemical Data
Muratli, J.M.; Chase, Z.; McManus, J.F.; Mix, A.C.
Chilean Margin 30Kyr Sediment Provenance Geochemical Data
2010-12-30
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/10334
Investigator
J.M.
Muratli
Investigator
Z.
Chase
Investigator
J.F.
McManus
Investigator
A.C.
Mix
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
geochemistry
geoscientificInformation
30185 cal yr BP
155 cal yr BP
Complete
-41
-36.159833
-74.45
-73.56633
-1015
-489
Ocean
Pacific Ocean
South Pacific Ocean
ODP 1233>LATITUDE -41>LONGITUDE -74.45
Ocean
Pacific Ocean
Eastern Pacific Ocean
ODP1235>LATITUDE -36.159833>LONGITUDE -73.56633
Ocean
Pacific Ocean
Eastern Pacific Ocean
ODP1234>LATITUDE -36.219167>LONGITUDE -73.68167
None
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English
DOC/NOAA/NESDIS/NCEI
National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
https://www.ncdc.noaa.gov/data-access/paleoclimatology-data
DATA Center Contact
Bruce
Bauer
bruce.a.bauer@noaa.gov
paleo@noaa.gov
303-497-6280
303-497-6513
325 Broadway, E/NE31
Boulder
CO
80305-3328
USA
online
ASCII
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
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.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/muratli2010b/muratli2010b.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/muratli2010b/muratli2010b.xls
USA/NOAA
DIF
Version 9.8.4
2019-05-06
2019-05-06