| Abstract: | An immature (Ro=0.39%), S-rich (S(org)/C = 0.07), organic matter-rich (19.6 wt. % TOC) limestone from the Ghareb Formation (Upper Cretaceous) in Jordan was artificially matured by hydrous pyrolysis (200, 220 ..., 300??C; 72 h) to study the effect of progressive diagenesis and early catagenesis on the amounts and distributions of hydrocarbons, organic sulfur compounds and S-rich geomacromolecules. The use of internal standards allowed the determination of absolute amounts. With increasing thermal maturation, large amounts of alkanes and alkylthiophenes with predominantly linear carbon skeletons are generated from the kerogen. The alkylthiophene isomer distributions do not change significantly with increasing thermal maturation, indicating the applicability of alkylthiophenes as biomarkers at relatively high levels of thermal maturity. For a given carbon skeleton, the saturated hydrocarbon, alkylthiophenes and alkylbenzo[b]thiophenes are stable forms at relatively high temperatures, whereas the alkylsulfides are not stable. The large amount of alkylthiophenes produced relative to the alkanes may be explained by the large number of monosulfide links per carbon skeleton. These results are in good agreement with those obtained previously for an artificial maturation series of an immature S-rich sample from the Gessoso-solfifera Formation.An immature (Ro = 0.39%), S-rich (Sorg/C = 0.07), organic matter-rich (19.6 wt.% TOC) limestone from the Ghareb Formation (Upper Cretaceous) in Jordan was artificially matured by hydrous pyrolysis (200, 220, ..., 300??C; 72 h) to study the effect of progressive diagenesis and early catagenesis on the amounts and distributions of hydrocarbons, organic sulfur compounds and S-rich geomacromolecules. The use of internal standards allowed the determination of absolute amounts. With increasing thermal maturation, large amounts of alkanes and alkylthiophenes with predominantly linear carbon skeletons are generated from the kerogen. The alkylthiophene isomer distributions do not change significantly with increasing thermal maturation, indicating the applicability of alkylthiophenes as biomarkers at relatively high levels of thermal maturity. For a given carbon skeleton, the saturated hydrocarbon, alkylthiophene and alkylbenzo[b]thiophenes are stable forms at relatively high temperatures, whereas the alkylsulfides are not stable. The large amount of alkylthiophenes produced relative to the alkanes may be explained by the large number of monosulfide links per carbon skeleton. These results are in good agreement with those obtained previously for an artificial maturation series of an immature S-rich sample from the Gessoso-solfifera Formation. |
| Genre: | Article |
| ProdID: | 70020398 |
| Citation Author: | Koopmans, M. P.; Rijpstra, W. I. C.; De Leeuw, J. W.; Lewan, M. D.; Damste, J. S. S. |
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| Citation End Page: | 521 |
| Citation Issue: | 7-8 |
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| Citation Language: | English |
| Citation Larger Work Title: | Organic Geochemistry |
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| Citation Number Of Pages: | 19 |
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| Citation Publisher: | Elsevier Sci Ltd |
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| Citation Search Results Text: | Artificial maturation of an immature sulfur- and organic matter-rich limestone from the Ghareb Formation, Jordan; 1998; Article; Journal; Organic Geochemistry; Koopmans, M. P.; Rijpstra, W. I. C.; De Leeuw, J. W.; Lewan, M. D.; Damste, J. S. S. |
| Citation Start Page: | 503 |
| Citation Volume: | 28 |
| Citation Year: | 1998 |
| Type: | citation/reference |
| Text: | Artificial maturation of an immature sulfur- and organic matter-rich limestone from the Ghareb Formation, Jordan; 1998; Article; Journal; Organic Geochemistry; Koopmans, M. P.; Rijpstra, W. I. C.; De Leeuw, J. W.; Lewan, M. D.; Damste, J. S. S. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/S0146-6380(98)00015-1 |
| Date Other: | Thu, 1 Jan 1998 00:00 -0600 |
| Publisher: | Elsevier Sci Ltd |
