Pyrite formation in bioturbated clays from the Jurassic of Britain

Details Pyrite formation in bioturbated clays from the Jurassic of Britain Pyrite formation in bioturbated clays from the Jurassic of Britain

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50..517f&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 50, Issue 4, pp.517-523

Physics

2

Scientific paper

The Dunans Clay and Upper Oxford Clay of Britain show the importance of bioturbating organisms in controlling the formation of pyrite in the surface layers of normal shales. These clays are characterized by low pyrite sulphur content (< 1.3%), low organic carbon content (2%) and light 34 S values (generally lighter than -29%.). These values are consistent with the formation of pyrite close to the surface where contact with the overlying seawater is maintained by the bioturbating fauna. Low inputs of organic carbon and its consumption by both aerobic and anaerobic bacteria limits the formation of pyrite. It is thought that particularly large apparent fractionations between pyrite and Jurassic seawater (up to -58%.) are the result of incorporation of isotopically light sulphate from extensive reoxidation of sulphide.

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