Mathematics – Logic
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.1043l&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 48, Issue 5, pp.1043-1058
Mathematics
Logic
3
Scientific paper
81 deep-ocean sediment samples obtained from the DSDP/IPOD program Legs 63-66, and six gravity-cores from DSDP/IPOD Leg 64 Guaymas Basin, Gulf of California, site survey cruise (SIO) were analyzed for perylene(s). Perylene was found to be most abundant in anoxic diatomaceous sediments containing moderate amounts of silts and/or clays. Elevated perylene yields, normalized to organic carbon contents, coincided with enhanced preservation of autochthonous tetraterpenoid and tetrapyrrole pigments, indicating a requirement of anoxia in the formation of perylene. Strongly euxinic conditions correlate with decreased perylene yields but not its total absence, as found for strongly aerobic deposition and/or redeposition. Perylene alkylation occurs in response to increasing in situ temperatures (alt. sub-bottom depth). This alkylation was found to begin with the generation of methyl (C-1) perylene and to eventually yield a perylene-alkyl perylene homologous series, in decreasing abundance, through the equivalent of C-3 (trimethyl, methyl-ethyl, propyl?) perylene. The realm of most intense perylene alkylation for Quaternary or Pliocene/ Miocene sediments corresponds with present in situ temperatures of 40-50°C or 30-35°C, respectively. Thus, the degree of perylene alkylation may represent an organic indicator for the thermal history of immature sediments. Geological phenomena, such as reworking and igneous intrusions, were found to complicate downhole perylene alkylation patterns. A substituted (-C 4 H 7 O 2 ) perylene was isolated from several anoxically deposited diatomaceous oozes and may represent one of the many possible perylene precursors. The possible source compounds and biota for sedimentary perylene are discussed in light of the present study and review of past reports.
Baker Earl W.
Louda William J.
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