| Abstract: | Oils generated by Middle Ordovician rocks are found throughout the Mid-Continent and east-central regions of the United States. Gas chromatographic characteristics of these oils include a relatively high abundance of n-alkanes with carbon numbers less than 20, a strong predominance of odd-numbered n-alkanes between C//1//0 and C//2//0, and relatively small amounts of branched and cyclic alkanes. The wide ranges in delta **1**3C for oils and rock extracts reflect a major, positive excursion(s) in organic matter delta **1**3C in late Middle Ordovician rocks. This excursion has at least regional significance in that it can be documented in sections 480 mi apart in south-central Kansas and eastern Iowa. The distance may be as much as 930 mi. The parallel shifts in organic and carbonate delta **1**3C in core samples from 1 E. M. Greene well, Washington County, Iowa, imply changes in the isotope composition of the ocean-atmosphere carbon reservoir. These and other aspects of the subject are discussed. |
| Genre: | Article |
| ProdID: | 70014137 |
| Citation Author: | Hatch, Joseph, R.; Jacobson, Stephen, R.; Witzke, Brian, J.; Risatti, J. Bruno; Anders, Donald, E.; Watney, W. Lynn; Newell, K. David; Vuletich, April, K. |
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| Citation End Page: | 1354 |
| Citation Issue: | 11 |
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| Citation Language: | English |
| Citation Larger Work Title: | American Association of Petroleum Geologists Bulletin |
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| Citation Number Of Pages: | 13 |
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| Citation Search Results Text: | POSSIBLE LATE MIDDLE ORDOVICIAN ORGANIC CARBON ISOTOPE EXCURSION: EVIDENCE FROM ORDOVICIAN OILS AND HYDROCARBON SOURCE ROCKS, MID-CONTINENT AND EAST-CENTRAL UNITED STATES.; 1987; Article; Journal; American Association of Petroleum Geologists Bulletin; Hatch, Joseph, R.; Jacobson, Stephen, R.; Witzke, Brian, J.; Risatti, J. Bruno; Anders, Donald, E.; Watney, W. Lynn; Newell, K. David; Vuletich, April, K. |
| Citation Start Page: | 1342 |
| Citation Volume: | 71 |
| Citation Year: | 1987 |
| Type: | citation/reference |
| Text: | POSSIBLE LATE MIDDLE ORDOVICIAN ORGANIC CARBON ISOTOPE EXCURSION: EVIDENCE FROM ORDOVICIAN OILS AND HYDROCARBON SOURCE ROCKS, MID-CONTINENT AND EAST-CENTRAL UNITED STATES.; 1987; Article; Journal; American Association of Petroleum Geologists Bulletin; Hatch, Joseph, R.; Jacobson, Stephen, R.; Witzke, Brian, J.; Risatti, J. Bruno; Anders, Donald, E.; Watney, W. Lynn; Newell, K. David; Vuletich, April, K. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 1987 00:00 -0600 |
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