Carbon isotope composition of bishomohopanoic acid in Miocene to recent marine sediments from the Nankai Trough (ODP Leg 190, Site 1178)(<SPECIAL ISSUE>Advances in molecular and stable isotope studies among the organic geochemical and related communities

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The distribution and carbon isotope composition of 17β(H), 21β(H)-bishomohopanoic acid (ββC_<32>-HA) were investigated in Miocene to recent marine sediments from Site 1178 of ODP Leg 190, Nankai Trough, offshore Shikoku, Japan. The concentration of ββC_<32>-HA tends to be higher in accreted sediments, which are characterized by a large contribution of terrestrial organic matter. The δ^<13>C values of ββC_<32>-HA are lighter in accreted sediments than in slope sediments, indicating different sources to some degree. The constant δ^<13>C values within the slope sediments and within the accreted sediments indicate that the sources of ββC_<32>-HA were unchanged during the deposition of each unit. In accreted sediments, the δ^<13>C value of ββC_<32>-HA is similar to that in soil components, suggesting that the hopanoic acids in accreted sediments may be mainly terrestrial organic compounds derived from the oxidation products of bacteriohopanepolyols on land.
2011-09-30