Mathematics – Logic
Scientific paper
Dec 1966
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966gecoa..30.1191j&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 30, Issue 12, pp.1191-1222
Mathematics
Logic
11
Scientific paper
Several shales and oils ranging in age from 3 million to 2·7 billion years have been investigated for their hydrocarbon content using gas chromatography and mass spectrometry as primary analytical tools. From the Soudan Shale from Minnesota (2·7 × 10 9 yr) the C 18 , C 19 , C 20 and C 21 isoprenoid-alkanes were obtained. The Antrim shale from Michigan (about 265 × 10 6 yr) yielded the C 16 , C 18 , C 19 , C 20 and C 21 isoprenoids, as well as a C 16 iso -alkane and the C 18 and C 19 cyclohexyl n -alkanes. The San Joaquin Oil (30 × 10 6 yr) and the Abbott Rock Oil (3 × 10 6 yr) contained the C 16 , C 18 , C 19 , C 20 and the C 18 , C 19 , C 20 and C 21 isoprenoids respectively. In addition, a series of iso -alkanes (C 16 -C 18 ), anteiso -alkanes (C 16 -C 18 ) and n -alkylcyclohexanes (C 16 -C 19 ) as well as a C 21 isoprenoid were obtained from the Nonesuch Seep Oil (1 × 10 9 yr). This analysis provides a comprehensive picture of the types of biogenic hydrocarbons found in oils and shales of widely differing ages, and in particular, the finding of isoprenoid alkanes in the Soudan Shale furnishes evidence for life processes at that period of geological time.
Belsky T.
Burlingame A. L.
Calvin Melvin
Haug Pat
Johns Bethany R.
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