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Role of crude oil in the genesis of Mississippi Valley-type deposits. Evidence from the Cincinnati arch

Journal Article · · Geology; (United States)
;  [1];  [2];  [3];  [4];  [5]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Univ. of Missouri, Rolla, MO (United States)
  3. Texas A M Univ., College Station, TX (United States)
  4. Univ. of Kentucky, Lexington, KY (United States)
  5. Univ. of Texas, Austin, TX (United States)
Mississippi Valley-type (MVT) sulfide minerals and oil from deposits along the Cincinnati arch have almost identical [delta][sup 34]S values (-9% to +9% for MVT sulfides, -12% to +9% for oils). These values are very similar to those for MVT sulfides and oil in the Illinois-Kentucky district and support their proposed inclusion in a regional hydrothermal system. Many MVT deposits with low [delta][sup 34]S values are closely associated with oil, whereas MVT deposits with high [delta][sup 34]S values often contain bitumen. Reduced sulfur in MVT deposits with high [delta][sup 34]S values probably came from thermochemical sulfate reduction, whereas that in MVT deposits with low [delta][sup 34]S values probably came from oil and related organic matter. Oil-related sulfur could have been derived from oil fields or disseminated oil and other organic matter in regional wallrocks. 44 refs., 3 figs., 2 tabs.
OSTI ID:
7198690
Journal Information:
Geology; (United States), Journal Name: Geology; (United States) Vol. 22:7; ISSN 0091-7613; ISSN GLGYBA
Country of Publication:
United States
Language:
English