“…Bulk chemical analyses were performed by SGS Minerals Services of Toronto, Canada, using a combination of x-ray fluorescence (Si, Ti, Al, Fe, MN, Mg, Ca, K, P, Rb, Sr, Zr, Ba), neutron activation (Na, Cr, As, Br, Sb, REE, Hg, Th), coulometry (CO 2 ), and Leco instrument (S). Uranium was determined by delayed neutron counting (detection limit = 0.1 ppm; Aldayel et al, 2002). Total organic carbon (TOC) was analyzed by Geolab Nor, Trondheim, using a Leco CS244 instrument.…”