Figure F19. Variations in the concentration of aragonite (A), quartz (Q), low-Mg calcite (LMC), high-Mg calcite (HMC), and dolomite (D) at Site 1130 as derived from XRD analysis. Calculations assume that the sediment is composed solely of these minerals and make no allowance for the presence of insoluble minerals other than quartz (see "Organic Geochemistry").