Total organic carbon, lithology and alkylthiophenes in immature sediments (Table 1)

• Main Authors: Kohnen, Math E L, Peakman, T M, Sinninghe Damsté, Jaap S, de Leeuw, Jan W
• Format: Dataset
• Language: English
• Published: PANGAEA 1990
• Subjects: 112-684C; 117-723B; 63-467; 64-481A; 75-532; 79-547A; Alkylthiophenes; Arabian Sea; Carbon; organic; total; Deep Sea Drilling Project; Description; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Epoch; Event label; Glomar Challenger; HAND; Italy; Joides Resolution; Jordan; Israel; Asia; Jurf_ed_Darawish; Leg112; Leg117; Leg63; Leg64; Leg75; Leg79; Lithology/composition/facies; North Atlantic/PLATEAU; North Pacific/GAP; North Pacific/Gulf of California/BASIN; Ocean Drilling Program; ODP; POINT DISTANCE from start; Sample code/label; Sampling by hand; South Atlantic; South Pacific Ocean; Vena_del_Gesso; Pacific; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.763284; https://doi.org/10.1594/PANGAEA.763284

A series of novel long-chain 3,4-dialkylthiophenes (C36–C54) was identified in a number of sediments ranging from Pleistocene to Cretaceous. The identifications were based on mass spectral characterisation, desulphurisation and mass spectral data of synthesised model compounds. These organic sulphur compounds are probably formed by sulphur incorporation into mid-chain dimethylalkadienes with two methylenic double bonds. These putative precursor lipids are unprecedented and may be considered rather unusual. The distribution of 3,4-dialkylthiophenes in sediments varies considerably with the depositional palaeoenvironment, indicating that these compounds have a potential as molecular markers reflecting changes in palaeoenvironment.