Figure F4. Carbonate concentrations and its C- and O-isotope compositions of sediments from Site 1040. Patterned areas represent fault zones and the décollement. A. Downhole variation of carbonate concentration. Concentrations are all <4 wt% and lower than those of Kimura, Silver, Blum, et al. (1997). B. Downhole dleta13C variations. Note that one sediment shows a value of –26.1permil and several samples have delta13C lower than –5permil. VPDB = Vienna Peedee belemnite. C. Downhole delta18O variations. There is no relationship between structural position, relative to fault zones and the décollement, and carbonate concentrations and isotopic compositions. VSMOW = Vienna standard mean ocean water.

Figure F4. Carbonate concentrations and its C- and O-isotope compositions of sediments from Site 1040. Patterned areas represent fault zones and the décollement. A. Downhole variation of carbonate concentration. Concentrations are all <4 wt% and lower than those of Kimura, Silver, Blum, et al. (1997). B. Downhole

¹³C variations. Note that one sediment shows a value of –26.1

and several samples have

¹³C lower than –5

. VPDB = Vienna Peedee belemnite. C. Downhole

¹⁸O variations. There is no relationship between structural position, relative to fault zones and the décollement, and carbonate concentrations and isotopic compositions. VSMOW = Vienna standard mean ocean water.