Other
Scientific paper
Aug 1960
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1960gecoa..19..272h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 19, Issue 4, pp.272-288
Other
6
Scientific paper
Pheophytin and other chlorin pigments are common in sediments deposited in fresh and marine environments due to the ready decomposition of the chlorophyll of the seston during deposition of the sediments. Laboratory investigations showed that it was possible to convert pheophytin to a petroleum-type porphyrin metal complex through a chlorin-metal intermediate. Examination of the dark organic gelatinous sediments of an almost stagnant autochthonous lake showed an appreciable content of trace hydrocarbons, in addition to chlorin pigments. Conversion of the chlorin pigments to petroleum-type porphyrins was apparent with increasing depth in the sediments, particularly when definite reducing conditions were established, at a position well below the top of the lake muds. Measurements of the rate of decomposition in the sediments carried out in the range 102-145°C and at pH 7.3, indicated the rapid decomposition of chlorins at lake-bottom temperatures. Measurements were also made of the rate of formation of nickel complexes of chlorins at 130-160°C and at pH 3.6-7.3. In general, the rate of formation of the metal complexes was appreciably slower than the decomposition of the chlorins, especially when the availability of nickel was definitely limited. The instability of the chlorin pigments may account for the low pigment to hydrocarbon ratio of crude oils relative to that of the initial sediments. The rate studies and the observation of petroleum-type porphyrins in lake sediments indicate the formation of petroleum pigments very early in the development of crude oil.
Baker Bruce L.
Elofson R. M.
Hitchon Brian
Hodgson Gordon W.
Peake Eric
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