Arctic Coring Expedition (ACEX): paleoceanographic and tectonic evolution of the central Arctic Ocean. and IODP Expedition 302 Scientists (Editors), 2006.

of Geosciences).īackman, J., Moran, K., McInroy, D., Mayer, L.A. įor further information and additional opportunities visit the homepage of the Research Group Crystallography (University of Bremen, Dept. In addition, more sophisticated quantification techniques (full pattern, Rietveld) are available.įor fast identification and visual analysis of measurements we also recommend the AppleMacIntosh freeware MacDiff.

If necessary also the full analysis can be performed (e.g., IODP 302, Backman et al., 2006). The R.I.P.-values are calculated as the ratio of the intensity of the most intense reflex of a specific mineral phase to the intensity of the most intense reflex of pure corundum (I/Ic) referring to the “matrix-flushing method” after Chung (1974).

The measurement is only the first step and mineral identification and (semi-) quantification has to follow.įor the mineral identification, the Philips software X’Pert HighScore™ is available, which, besides the mineral identification, gives a semi-quantitative value for each identified mineral on the basis of Relative Intensity Ratio (R.I.P)-values. Please note that this has to be announced far in advance. In cooperation with other laboratories clay fraction separation and preparation would be an option. Of course, other measuring programs can be run as well. 23 samples per day if the lab is fully dedicated to the onshore science party work. Therefore, one can calculate with approx. This will lead to a measuring time of 1 hour per sample (compared to about 2.5 h with a standard scintillation detector). A typical measurement of bulk material powder can be done as a continuous scan from 3 – 85° 2theta, with a calculated step size of 0.016° 2theta (and for example calculated time per step of 100 seconds). The X-ray diffraction can be measured on a high end Philips X’Pert Pro multipurpose diffractometer equipped with a Cu-tube (k(alpha) 1.541, 45 kV, 40 mA), a fixed divergence slit of (typically) ¼°, a 16 samples changer, a secondary monochromator and the X’Celerator detector system. In addition the determination of well crystallized minerals like quartz, calcite or aragonite can be done with better standard deviations if calibration curves are available (Tucker 1988). Christoph Vogt.ĭried bulk samples have to be grounded to a fine powder (20% clay fraction. X-ray diffraction pattern analyses can be done in the laboratories of the research group Crystallography (University of Bremen, Dept.

X&#39;pert highscore

X'pert highscore