Changes

[[file:oiloil-and-oilsource-rock-correlations_fig8-26.png|200px|thumb|{{figure number|4}}m/z 191 mass fragmentogram of an oil displaying the most common type of homohopane distribution.]]

[[file:oiloil-and-oilsource-rock-correlations_fig8-26.png|200px|thumb|{{figure number|4}}m/z 191 mass fragmentogram of an oil displaying the most common type of homohopane distribution.]]

Hopanes, which originate from bacteria, are the most abundant triterpanes. A distribution with a regular decrease of homohopanes from C₃₁ to C₃₅ is thought to be associated with clastic environments.<ref name=ch08r59>Waples, D., W., Machihara, T., 1991, Biomarkers for geologists: Tulsa, AAPG, 91 p.</ref> and/or more oxidizing conditions<ref name=ch08r39>Peters, K., E., Moldowan, J., M., 1993, The Biomarker Guide—Interpreting [[Molecular fossils]] in Petroleum and Ancient Sediments: Englewood Cliffs, New Jersey, Prentice-Hall, 363 p.</ref>

Hopanes, which originate from bacteria, are the most abundant triterpanes. A distribution with a regular decrease of homohopanes from C₃₁ to C₃₅ is thought to be associated with clastic environments.<ref name=ch08r59>Waples, D. W., and T. Machihara, 1991, Biomarkers for geologists: AAPG Methods in Exploration 9, 91 p.</ref> and/or more oxidizing conditions<ref name=ch08r39>Peters, K. E., and J. M. Moldowan, 1993, The Biomarker Guide—Interpreting [[Molecular fossils]] in Petroleum and Ancient Sediments: Englewood Cliffs, New Jersey, Prentice-Hall, 363 p.</ref>

[[:file:oiloil-and-oilsource-rock-correlations_fig8-26.png|Figure 4]] shows the m/z 191 mass fragmentogram of an oil displaying the most common type of homohopane distribution.

[[:file:oiloil-and-oilsource-rock-correlations_fig8-26.png|Figure 4]] shows the m/z 191 mass fragmentogram of an oil displaying the most common type of homohopane distribution.