| Abstract: | Maceral fractions of the Type II-S kerogens from the Monterey Formation (Miocene. California. U.S.A.) and Duwi Formation (Campanian/Maastrichtian, Egypt) were separated by density gradient centrifugation. The Monterey Fm. kerogen sample was comprised chiefly of light red-fluorescing amorphous organic matter (AOM), the flash pyrolyzate of which was characterized by a predominance of alkylbenzenes, alkylthiophenes and alkylpyrroles. In contrast, the pyrolyzates of its alginite concentrate showed a highly aliphatic character, typical of this maceral, with the series of n-alkenes and n-alkanes (C6- C26) predominating. The pyrolyzate of the dominant light brown-fluorescing AOM of the Duwi Fm. kerogen had a relatively high concentration of alkylbenzenes and alkylthiophenes, while its elginite concentrate showed a more aliphatic character upon pyrolysis. There was a marked enrichment of thiophenic sulfur in the light-colored AOM of both samples (and also pyrrolic nitrogen in the case of the Monterey) relative to the alginite. The results support a bacterially-mediated, degradative origin for Type II-S amorphous organic matter, with algal remains as the primary source of the kerogen. |
| Genre: | Article |
| ProdID: | 70018526 |
| Citation Author: | Stankiewicz, B. A.; Kruge, M. A.; Mastalerz, M.; Salmon, G. L. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | |
| Citation End Page: | 509 |
| Citation Issue: | 5 |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | Organic Geochemistry |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | 15 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | Geochemistry of the alginite and amorphous organic matter from type II-S kerogens; 1996; Article; Journal; Organic Geochemistry; Stankiewicz, B. A.; Kruge, M. A.; Mastalerz, M.; Salmon, G. L. |
| Citation Start Page: | 495 |
| Citation Volume: | 24 |
| Citation Year: | 1996 |
| Type: | citation/reference |
| Text: | Geochemistry of the alginite and amorphous organic matter from type II-S kerogens; 1996; Article; Journal; Organic Geochemistry; Stankiewicz, B. A.; Kruge, M. A.; Mastalerz, M.; Salmon, G. L. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/0146-6380(96)00048-4 |
| Date Other: | Mon, 1 Jan 1996 00:00 -0600 |
| Publisher: | |
