A genetic link between synsedimentary tectonics-expelled fluids, microbial sulfate reduction and cone-in-cone structures. - Archive ouverte HAL Access content directly
Journal Articles Marine and Petroleum Geology Year : 2018

A genetic link between synsedimentary tectonics-expelled fluids, microbial sulfate reduction and cone-in-cone structures.

Abstract

The late Jurassic (Tithonian) marlstones of the Boulonnais area (English Channel, France) contains diagenetic carbonate beds and nodules. Some nodules exhibit cone-in-cone structures on their lower face. We studied such nodules using various techniques of imaging and chemical (major and trace-elements) and isotopic analyses (Ccarb, Corg, O and S stable isotopes). We interpret the cone-in-cone to be the end product of carbonate-nodule formation during early diagenesis. The diagenetic carbonate precipitation was induced by microbial activity (bacteria and(?) archeae) fueled by upward-migrating fluids. Fluid expulsion was itself triggered by synsedimentary fault movements. Under such circumstances, cone-in-cone structures can form during early diagenesis as the result of bacterially-mediated sulfate reduction, possibly coupled to sulfate-dependent anaerobic oxidation of methane. This genetical scheme may be transposed to many other settings.
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Dates and versions

hal-01821663 , version 1 (22-06-2018)

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Nicolas Tribovillard, Anélia Petit, Melesio Quijada, Armelle Riboulleau, Pierre Sansjofre, et al.. A genetic link between synsedimentary tectonics-expelled fluids, microbial sulfate reduction and cone-in-cone structures.. Marine and Petroleum Geology, 2018, 93, pp.437-450. ⟨10.1016/j.marpetgeo.2018.03.024⟩. ⟨hal-01821663⟩
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