noaa-lake-17368 Metal deposition and sedimentology in a closed-basin lake near Quelccaya Ice Cap during the Holocene Beal, S.A.; Meredith, K.A.; Stroup, J.S.; Jackson, B.P.; Lowell, T.V.; Tapia, P. Metal deposition and sedimentology in a closed-basin lake near Quelccaya Ice Cap during the Holocene 2014-06-11 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/17368 Investigator S.A. Beal Investigator K.A. Meredith Investigator J.S. Stroup Investigator B.P. Jackson Investigator T.V. Lowell Investigator P. Tapia earth science paleoclimate paleolimnology depth at sample start,null,null,centimeter,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology titanium,sediment,null,count per second,null,paleolimnology,null,energy-dispersive x-ray fluorescence spectroscopy,N,detector kilo counts per second earth science paleoclimate paleolimnology age,null,null,calendar year before present,null,paleolimnology,null,null,N,median age; Bacon Bayesian Age Model earth science paleoclimate paleolimnology lead,sediment,null,milligram per kilogram,null,paleolimnology,null,inductively-coupled plasma atomic emission spectroscopy,N,null earth science paleoclimate paleolimnology mercury,sediment,null,microgram per square meter per year,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology biogenic silica,sediment,null,percent,null,paleolimnology,null,spectrophotometry,N,null earth science paleoclimate paleolimnology iron,sediment,null,gram per kilogram,null,paleolimnology,null,inductively-coupled plasma atomic emission spectroscopy,N,null earth science paleoclimate paleolimnology mercury,sediment,null,microgram per kilogram,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology organic matter,sediment,null,percent,null,paleolimnology,null,loss on ignition,N,null earth science paleoclimate paleolimnology geochemistry geoscientificInformation precipitation temperature 12364 cal yr BP -57 cal yr BP Complete -13.944675 -13.944675 -70.873715 -70.873715 4910 4910 Continent South America Peru Yanacocha>LATITUDE -13.944675>LONGITUDE -70.873715 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. 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

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Boulder CO 80305-3328 USA online ASCII Beal, Samuel; Kelly, Meredith; Stroup, Justin; Jackson, Brian; Lowell, Thomas; Tapia, Pedro 2014 Global Biogeochemical Cycles 28 437-450 10.1002/2013GB004780

Mercury (Hg) is a toxic metal that is transported globally through the atmosphere. Emissions of Hg from mineral reservoirs and recycling between soil/biomass, oceans, and the atmosphere are fundamental to the global Hg cycle, yet past emissions from anthropogenic and natural sources are not fully constrained. We use a sediment core from Yanacocha, a headwater lake in southeastern Peru, to study the anthropogenic and natural controls on atmospheric Hg deposition during the Holocene. From 12.3 to 3.5 ka, Hg fluxes in the record are relatively constant (mean ± 1σ: 1.4 ± 0.6 ugm-2 a-1). Past Hg deposition does not correlate with changes in regional temperature and precipitation or with most large volcanic events that occurred regionally (~300–400 km from Yanacocha) and globally. In 1450 B.C. (3.4 ka), Hg fluxes abruptly increased and reached the Holocene-maximum flux (6.7 ugm-2 a-1) in 1200 B.C., concurrent with a ~100 year peak in Fe and chalcophile metals (As, Ag, Tl) and the presence of framboidal pyrite. Continuously elevated Hg fluxes from 1200 to 500 B.C. suggest a protracted mining-dust source near Yanacocha that is identical in timing to documented pre-Incan cinnabar mining in central Peru. During Incan and Colonial time (A.D. 1450–1650), Hg deposition remains elevated relative to background levels but lower relative to other Hg records from sediment cores in central Peru, indicating a limited spatial extent of preindustrial Hg emissions. Hg fluxes from A.D. 1980 to 2011 (4.0± 1.0 ugm-2 a-1) are 3.0 ± 1.5 times greater than preanthropogenic fluxes. STUDY NOTES: Continuous 1-cm sampling of a 3.3-m sediment core from Yanacocha and analysis for metals, LOI550, biogenic silica, and total Ti; Key Points, "Hg deposition did not vary with past precipitation, temperature,and volcanism", Maximum Holocene Hg fluxes occurred ~3 thousand years ago, Modern Hg fluxes are 3 times greater than natural fluxes;

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/peru/beal2014yanacocha.txt Data; beal2014yanacocha.txt USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11