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Organic compounds: environmental indicators (view source)
Revision as of 19:58, 16 June 2014
, 19:58, 16 June 2014→Hopanes
==Hopanes==
==Hopanes==
[[file:oiloil-and-oilsource-rock-correlations_fig8-26.png|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 C<sub>31</sub> to C<sub>35</sub> 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 C<sub>31</sub> to C<sub>35</sub> 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>