Figure F4. Chemostratigraphic section at ODP Site 1149, based on logging data in Hole 1149B (gray line) and chemical analyses of core samples from Holes 1149A and 1149B (solid circles; Plank and Kelley, 2001). Oxide data are from geochemical logging tool, renormalized to 100% to include all major element oxides and H2O. Thorium data are from the Hostile Environment Gamma Ray Spectrometry tool and core data, corrected to in situ concentrations. Note good agreement between borehole and sample data, except in chert-rich lithologies, where larger footprint (tens of centimeters) of borehole logs averages thin layers of dramatically different composition (e.g., chert vs. clay vs. carbonate). Age boundaries are as follows: I/II (paleomagnetic stratigraphy; Plank, Ludden, Escutia, et al., 2000), II/III (middle Albian radiolarian zones; Bartolini, this volume), III/IV (Hauterivian/Barremian radiolarian zones; Bartolini, this volume), and basement age (assuming M12 chron; Bartolini, this volume). Ages based on timescale of Gradstein (1995). MORB = mid-ocean-ridge basalt.

Figure F4. Chemostratigraphic section at ODP Site 1149, based on logging data in Hole 1149B (gray line) and chemical analyses of core samples from Holes 1149A and 1149B (solid circles; Plank and Kelley, 2001). Oxide data are from geochemical logging tool, renormalized to 100% to include all major element oxides and H₂O. Thorium data are from the Hostile Environment Gamma Ray Spectrometry tool and core data, corrected to in situ concentrations. Note good agreement between borehole and sample data, except in chert-rich lithologies, where larger footprint (tens of centimeters) of borehole logs averages thin layers of dramatically different composition (e.g., chert vs. clay vs. carbonate). Age boundaries are as follows: I/II (paleomagnetic stratigraphy; Plank, Ludden, Escutia, et al., 2000), II/III (middle Albian radiolarian zones; Bartolini, this volume), III/IV (Hauterivian/Barremian radiolarian zones; Bartolini, this volume), and basement age (assuming M12 chron; Bartolini, this volume). Ages based on timescale of Gradstein (1995). MORB = mid-ocean-ridge basalt.