| Abstract: | A thermal and chemical degradation approach was followed to determine the precursors of pristane (Pr) and phytane (Ph) in samples from the Gessoso-solfifera, Ghareb and Green River Formations. Hydrous pyrolysis of these samples yields large amounts of Pr and Ph carbon skeletons, indicating that their precursors are predominantly sequestered in high-molecular-weight fractions. However, chemical degradation of the polar fraction and the kerogen of the unheated samples generally does not release large amounts of Pr and Ph. Additional information on the precursors of Pr and Ph is obtained from flash pyrolysis analyses of kerogens and residues after hydrous pyrolysis and after chemical degradation. Multiple precursors for Pr and Ph are recognised in these three samples. The main increase of the Pr/Ph ratio with increasing maturation temperature, which is associated with strongly increasing amounts of Pr and Ph, is probably due to the higher amount of precursors of Pr compared to Ph, and not to the different timing of generation of Pr and Ph.A thermal and chemical degradation approach was followed to determine the precursors of pristane (Pr) and phytane (Ph) in samples from the Gessoso-solfifera, Ghareb and Green River Formations. Hydrous pyrolysis of these samples yields large amounts of Pr and Ph carbon skeletons, indicating that their precursors are predominantly sequestered in high-molecular-weight fractions. However, chemical degradation of the polar fraction and the kerogen of the unheated samples generally does not release large amounts of Pr and Ph. Additional information on the precursors of Pr and Ph is obtained from flash pyrolysis analyses of kerogens and residues after hydrous pyrolysis and after chemical degradation. Multiple precursors for Pr and Ph are recognised in these three samples. The main increase of the Pr/Ph ratio with increasing maturation temperature, which is associated with strongly increasing amounts of Pr and Ph, is probably due to the higher amount of precursors of Pr compared to Ph, and not to the different timing of generation of Pr and Ph. |
| Genre: | Article |
| ProdID: | 70021350 |
| Citation Author: | Koopmans, M. P.; Rijpstra, W. I. C.; Klapwijk, M. M.; De Leeuw, J. W.; Lewan, M. D.; Sinninghe, Damste, J. S. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | |
| Citation End Page: | 1104 |
| Citation Issue: | 9 |
| 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: | 16 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | Elsevier Science Ltd |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | A thermal and chemical degradation approach to decipher pristane and phytane precursors in sedimentary organic matter; 1999; Article; Journal; Organic Geochemistry; Koopmans, M. P.; Rijpstra, W. I. C.; Klapwijk, M. M.; De Leeuw, J. W.; Lewan, M. D.; Sinninghe, Damste, J. S. |
| Citation Start Page: | 1089 |
| Citation Volume: | 30 |
| Citation Year: | 1999 |
| Type: | citation/reference |
| Text: | A thermal and chemical degradation approach to decipher pristane and phytane precursors in sedimentary organic matter; 1999; Article; Journal; Organic Geochemistry; Koopmans, M. P.; Rijpstra, W. I. C.; Klapwijk, M. M.; De Leeuw, J. W.; Lewan, M. D.; Sinninghe, Damste, J. S. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/S0146-6380(99)00088-1 |
| Date Other: | Fri, 1 Jan 1999 00:00 -0600 |
| Publisher: | Elsevier Science Ltd |
