Sulfur isotopes in Cretaceous shales of North America

Conference · Tue Jan 01 04:00:00 EST 1985 · Geol. Soc. Am., Abstr. Programs; (United States)

OSTI ID:6863088

Gautier, D L

Isotopic compositions of pyrite sulfur vary systematically with the depositional facies of fine-grained marine rocks. Laminated clay shales with more than 4% organic carbon (Corg) contain pyrite that is extremely depleted in /sup 34/S (mean delta/sup 34/S = -31 per thousand, CDT). These shales contain hydrogen-rich (Type II) organic matter deposited slowly under anaerobic bottom waters. Shales with Corg <1.5% show a wide range of delta/sup 34/S values (-34.6 to +16.8 per thousand; mean delta/sup 34/S = -12.4 per thousand). These mudstones are bioturbated and contain only hydrogen-poor (Type III) organic matter, probably derived from land plants. Samples containing 1.5%

• Research Organization: Geologic Survey, Denver, CO (USA)
• OSTI ID: 6863088
• Report Number(s): CONF-8510489-
• Conference Information: Journal Name: Geol. Soc. Am., Abstr. Programs; (United States) Journal Volume: 17
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580400* -- Geochemistry-- (-1989)
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHEMISTRY
CRETACEOUS PERIOD
GEOCHEMISTRY
GEOLOGIC AGES
GEOLOGIC HISTORY
IRON COMPOUNDS
IRON SULFIDES
ISOTOPE RATIO
ISOTOPES
MESOZOIC ERA
MINERALS
NORTH AMERICA
PYRITE
QUANTITATIVE CHEMICAL ANALYSIS
ROCKS
SEDIMENTARY ROCKS
SHALES
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
SULFUR ISOTOPES
TRANSITION ELEMENT COMPOUNDS