103 research outputs found
A compilation of X-ray interaction data for X-ray fluorescence analysis of geological samples
Late-Holocene Atlantic bottom-water variability in Igaliku Fjord, South Greenland, reconstructed from foraminiferal faunas
A high-resolution record of late-Holocene subsurface water-mass characteristics in outer Igaliku Fjord, South Greenland, is presented based on benthic foraminifera faunas from core PO 243â451 collected from a water depth of 304 m. Stratiâ cation with Atlantic water masses present in the lower part of the water-column is suggested to have prevailed during the last 3200 cal. years, except for a period referred to as theâMediaeval Warm Periodâ (MWP). During the MWP (c. ad 885â1235) the outer part of Igaliku Fjord experienced enhanced vertical mixing and a high hydrodynamic energy level which we ascribe to increasing wind stress through this period, corresponding to the period of the Norse settlement. The transition from the MWP to theâLittle Ice Ageâ (LIA) shows a two-step pattern with a short climatic amelioration around AD 1520 before maximum cooling occurred. The intensified wind stress and the overall environmental change are suggested to have contributed to the loss of the Norse settlement in Greenland. Periods with strong stratification and marked in uence of Atlantic subsurface water masses around 2.6, 1.3 ka BP and during the LIA are correlated to North Atlantic Holocene ice-rafting events reported by Bond et al. (1997)
Determination of the isotopic composition of natural and slightly enriched uranium by alpha-spectrometry
Non-destructive Determination of Metals in Rocks by Radioisotope X-Ray Fluorescence Instrumentation
An instrumental procedure to determine Fe, Rb, Sr, Y, Zr, Nb and Mo in rock powders by Si(Li) X-ray spectrometry
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