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Change in hydrogen isotope composition of n-alkanes, pristane, phytane, and aromatic hydrocarbons in Miocene siliceous mudstones with increasing maturity
| Title: | Change in hydrogen isotope composition of n-alkanes, pristane, phytane, and aromatic hydrocarbons in Miocene siliceous mudstones with increasing maturity |
| Authors: | Kikuchi, Toru Browse this author | | Suzuki, Noriyuki Browse this author | | Saito, Hiroyuki Browse this author |
| Issue Date: | Sep-2010 |
| Publisher: | Elsevier Ltd. |
| Journal Title: | Organic Geochemistry |
| Volume: | 41 |
| Issue: | 9 |
| Start Page: | 940 |
| End Page: | 946 |
| Publisher DOI: | 10.1016/j.orggeochem.2010.05.004 |
| Abstract: | The variation in the hydrogen isotope composition (D/H ratio values) of n-alkanes, pristane, phytane, and aromatic hydrocarbons with increasing maturity was investigated using a set of immature to mature Miocene siliceous mudstones. The D/H values of aromatic hydrocarbons change at the earliest stage (vitrinite reflectance, Ro = 0.4–0.5%), by way of higher values in immature rocks. A dramatic increase in values is observed for pristane and phytane during the mature stage (Ro = 0.6–0.7%), attributable to hydrogen exchange with sediment porewater. The decrease in the values of short chain n-alkanes and the disappearance of carbon number predominance in n-alkane D/H values with increasing maturity is a result of the thermal cracking of aliphatic structures in bitumen and kerogen. The long chain n-alkanes derived from higher plant wax can maintain their initial values, even in the zone of extensive oil generation (Ro < 0.7%). |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/43825 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 鈴木 徳行
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