caa a22 4500 46907762X CHVBK 20180323132939.0 cr unu---uuuuu 170328e19920101xx s 000 0 eng 10.1007/BF00181714 doi (NATIONALLICENCE)springer-10.1007/BF00181714 Stratigraphy of total metals in PIRLA sediment cores [Elektronische Daten] [Stephen Norton, Ray Bienert Jr., Michael Binford, Jeffrey Kahl] Sediment cores from 30 low-alkalinity lakes in northern New England (NE), New York (NY), the northern Great Lakes States (NGLS) of Minnesota, Michigan, and Wisconsin, and Florida (FL) have been dated by 210Pb and analyzed for water and organic content, eight major elements (Al, Ti, Fe, Mn, Ca, Mg, Na, K) plus four trace metals (Pb, Zn, Cu, and V). Variations in the percentages of major elements through time are dominated by long-term independent variations in the abundance of SiO2, FeO, and to a lesser extent Ca and Al. Additional variations are caused by varying proportions of inorganic matter. Major variations in chemistry are generally unrelated to documented distrubances in the watersheds; most disturbances are minor fires or selective logging. Accelerated accumulation of Pb from atmospheric sources into sediment first occurs in sediment dated between 1800 and 1850 in NY and NE, slightly later in the NGLS region, and about 1900 in FL. Modern accumulation rates in all areas are comparable (ca. 1 to 4 μg cm−2 yr−1). Accumulation rates of Pb in some lakes have declined significantly from 1975 to 1985. Atmospheric deposition of anthropogenic Zn and Cu is also indicated by generally increasing accumulation rates in sediment cores, but the record is not as clear nor are chemical profiles in all lakes parallel to the trends in atmospheric emissions inferred on the basis of fossil fuel consumption, smelting, and other industrial activities. Inter-lake variations in profiles of Cu and Zn are large. Vanadium accumulation rates increase by the 1940s in NY and NE, but not until the 1950s in the NGLS region. This timing correlates with regional trends in the combustion of fuel oil, a major source of atmospheric V. Acidification of some of the lakes is suggested by decreases in the concentration and accumulation rates of Mn, Ca, and Zn in recent sediment, relative to other elements of catchment origin. The decreases generally occur slightly before the onset of acidification as indicated by diatoms. Increased sediment accumulation rates for Fe may indicate the acidification of watershed soils. The use of the accumulation rate of TiO2 as an indicator of rates of erosion and for normalization of trace metal accumulation rates is in question for lakes where the flux of TiO2 from the atmosphere varies and is a significant fraction of the total flux of TiO2 to the sediment. Kluwer Academic Publishers, 1992 geochemistry nationallicence metals nationallicence lake sediments nationallicence paleolimnology nationallicence United States nationallicence Norton Stephen Department of Geological Sciences, University of Maine, 04469, Orono, ME, USA aut Bienert Jr. Ray Department of Environmental Engineering Sciences, University of Florida, 32611, Gainesville, FL, USA aut Binford Michael Graduate School of Design, Harvard University, 02138, Cambridge, MA, USA aut Kahl Jeffrey Department of Geological Sciences, University of Maine, 04469, Orono, ME, USA aut Journal of Paleolimnology Kluwer Academic Publishers 7/3(1992-01-01), 191-214 0921-2728 7:3<191 1992 7 10933 https://doi.org/10.1007/BF00181714 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00181714 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Norton Stephen Department of Geological Sciences, University of Maine, 04469, Orono, ME, USA aut NATIONALLICENCE 700 1- Bienert Jr Ray Department of Environmental Engineering Sciences, University of Florida, 32611, Gainesville, FL, USA aut NATIONALLICENCE 700 1- Binford Michael Graduate School of Design, Harvard University, 02138, Cambridge, MA, USA aut NATIONALLICENCE 700 1- Kahl Jeffrey Department of Geological Sciences, University of Maine, 04469, Orono, ME, USA aut NATIONALLICENCE 773 0- Journal of Paleolimnology Kluwer Academic Publishers 7/3(1992-01-01), 191-214 0921-2728 7:3<191 1992 7 10933 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer