Organic geochemical and tectonic evolution of the midcontinent rift system: Organic geochemistry and micropaleontology

Technical Report · Fri Jun 01 04:00:00 EDT 1990

DOI:https://doi.org/10.2172/6866228· OSTI ID:6866228

Hayes, J M; Pratt, L M ^[1]; Knoll, A H ^[2]

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1. Indiana Univ., Bloomington, IN (USA). Dept. of Chemistry Indiana Univ., Bloomington, IN (USA). Dept. of Geological Sciences
2. Harvard Univ., Cambridge, MA (USA). Dept. of Earth and Planetary Sciences

During the second year of funding for this project, we completed routine organic geochemical analyses on a set of about 150 samples of the Nonesuch Formation from cores and outcrops in Wisconsin and Michigan. Hieshima and Lichtfouse traveled to the Iowa Geological Survey in December, 1989 to sample cores and cutting from the M.G. Eischied {number sign}1 Well. This exploration well penetrated over 4,000 meters of Precambrian volcanic and sedimentary strata, ultimately encountering about 400 meters of black shale similar to the Nonesuch at a depth close to 5,000 meters. In February and March of 1990, Hieshima traveled to Australia and worked for two months with Roger Summons (Bureau of Mineral Resources) on the molecular structure of chemical fossils (biomarkers) in the Nonesuch. Isomeric ratios and absolute abundances of both common and novel biomarkers were determined for the saturated and aromatic hydrocarbon fractions of about twenty samples. During May Jeff Mauk (Ph.D. student with William Kelly at the University of Michigan) came to Indiana with carefully collected samples of rocks and petroleums from the White Pine Mine. Analytical data on these samples will provide a basis for comparison of thermal maturity and chemical alteration between the Nonesuch within and outside the zone of copper mineralization.

• Research Organization: Indiana Univ. Foundation, Bloomington, IN (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: FG02-88ER13978
• OSTI ID: 6866228
• Report Number(s): DOE/ER/13978-2; ON: DE90013107
• Country of Publication: United States
• Language: English

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