East Greenland Margin Holocene Glacial Mineralogy Data Andrews, J.T.; Jennings, A.E.; Coleman, G.C.; Eberl, D.D. Andrews, J.T. Jennings, A.E. Coleman, G.C. Eberl, D.D. earth science/paleoclimate/paleocean (BS1191-K14>LATITUDE 68.191>LONGITUDE -29.595) (BS1191-K6>LATITUDE 68.409>LONGITUDE -32.331) (MD99-2317>LATITUDE 68.103>LONGITUDE -27.861) (BS1191-K12>LATITUDE 68.111>LONGITUDE -31.425) (BS1191-K11>LATITUDE 68.115>LONGITUDE -31.431) (MD99-2322>LATITUDE 67.136>LONGITUDE -30.828) (JM96-1210>LATITUDE 68.183>LONGITUDE -29.6) (JM96-1207>LATITUDE 68.1>LONGITUDE -29.35) (JM96-1214 >LATITUDE 67.3>LONGITUDE -30.966) (BS1191-K8>LATITUDE 68.133>LONGITUDE -31.862) (BS1191-K5>LATITUDE 67.409>LONGITUDE -31.066) (JM96-1205>LATITUDE 68.071>LONGITUDE -27.835) (BS1191-K15>LATITUDE 68.1>LONGITUDE -29.454) Quantitative X-Ray Diffraction (qXRD) analysis of the <2 mm sediment fraction from surface (sea floor) samples, and marine sediment cores that span the last 10-12 cal ka BP, are used to describe spatial and temporal variations in non-clay mineral compositions for an area between Kangerlussuaq Trough and Scoresby Sund (~67°-70°N), East Greenland. Bedrock consists primarily of an early Tertiary alkaline complex with high weight% of pyroxene and plagioclase. Farther inland and to the north, the bedrock is dominantly felsic with a high fraction of quartz and potassium feldspars. Principal Component (PC) analysis of the non-clay sediment compositions indicates the importance of quartz and pyroxene as compositional end members, with an abrupt shift from quartz and k-feldspar dominated sediments north of Scoresby Sund to sediments rich in pyroxene and plagioclase feldspars offshore from the early Tertiary basaltic outcrop. Coarse (<2 mm or <1 mm) ice-rafted sediments are largely absent from the trough sediments between ~8 and 5 cal ka BP, but then increase in the last 4 cal ka BP. Compositional unmixing of the sediments in Grivel Basin and Kangerlussuaq Trough indicate the dominance of local over long distance sediment sources, with pulses of sediment from tidewater glaciers in Kangerlussuaq and Nansen fjords reaching the inner shelf during the Neoglaciation. The change in IRD is more dramatic in the sediment grain-size proxies than in the quartz wt%. Forty to seventy percent of the variance in the quartz records from either side of Denmark Strait is explained by low frequency trends, but the data from the Grivel Basin, East Greenland, are distinctly different, with an approximate 2500 yr periodicity. STUDY NOTES: Estimated weight % of non-clay and clay minerals in the < 2 mm size fraction using the method described by Eberl (2003, 2004) (www.mail-archive.com/rietveld_l@ill.fr/msg02371.html). Figures 1 and 2 show the regional and local setting for the study; data for core locations (Fig. 2) are detailed in Table 1. Table 2 lists the quantitative X-ray diffraction non-clay and clay weight % data for source areas in a series of worksheets; Table 3 consists of a series of worksheets that list the down core mineralogy of a series of cores along a north to south transect (Grivel Basin, Nansen Trough, and Kangerlussuaq Trough). For each depo-center the data are listed by depth. Depth/age models, based on AMS radiocarbon dates, are available, and the sources are listed in Table 1. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Andrews, J.T. Investigator : Jennings, A.E. Investigator : Coleman, G.C. Investigator : Eberl, D.D. 2010-07-09 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/10421 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/andrews2010/andrews2010.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/andrews2010/andrews2010.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/andrews2010/andrews2010.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/andrews2010/andrews2010.txt English https://www.ncdc.noaa.gov/paleo/study/10421 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/andrews2010/andrews2010.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/andrews2010/andrews2010.txt Andrews, J.T., A.E. Jennings, G.C. Coleman, and D.D. Eberl. 2010. Holocene variations in mineral and grain-size composition along the East Greenland glaciated margin (ca 67°-70°N): Local versus long-distance sediment transport. Quaternary Science Reviews, Vol. 29, pp. 2619-2632. doi:10.1016/j.quascirev.2010.06.001 START YEAR: 12000 cal yr BP * END YEAR: 0 cal yr BP -32.331 67.136 -27.835 68.409