Quantity and isotopic composition of reduced sulfur in Cretaceous organic-rich shales

Over 200 samples of mid-Cretaceous organic-rich sediment were examined to determine abundance and isotopic composition of reduced sulfur. Mid-Cretaceous pelagic sediments, particularly those of the North and South Atlantic, are characterized by high organic carbon contents relative to the modern average and should contain significant amounts of reduced sulfur, primarily pyrite. However, existing models of sulfur-carbon-iron relationships cannot account for the distribution of pyrite in mid-Cretaceous shales. Pyrite distribution in these sediments can better be described in terms of: (1) the quality of organic matter available and its effect on reduction rate, (2) physical sorting during sediment transport, and (3) the absence of reactive iron coincident with hydrogen sulfide.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Geology

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Bonnell, Linda Marie

Contributors dc:contributor

• Anderson, Thomas F.

• Geochemistry

Statement dc:rights

• Copyright 1990 Bonnell, Linda Marie

Language dc:language

eng

Identifier

AAI9021654
(UMI)AAI9021654

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/21367