In the Miocene of the northern Apennines, methane-derived limestones from various geologic settings represent important examples of fossil chemoherms and provide a basis for more accurate interpretations of seepage systems. The systematic study of fossil chemoherms has allowed the definition of new field and compositional criteria for the recognition of these deposits, which were previously based almost exclusively on negative carbon isotope composition and peculiar chemosynthetic communities; this has constrained the relations between seepage and sedimentary and tectonic instability processes. We suggest that the peculiar brecciated structures associated with fossil chemoherms are related to diapirism or overpressured pelitic sediments due to fluid venting. Fluidization of sediments increases the instability of mudstones in which chemoherms are contained, thus favoring gravity slumping processes and the reworking of many chemoherms.

Miocene chemoherms of the northern Apennines, Italy / Conti, Stefano; Fontana, Daniela. - In: GEOLOGY. - ISSN 0091-7613. - STAMPA. - 27(10):(1999), pp. 927-930.

Miocene chemoherms of the northern Apennines, Italy

CONTI, Stefano;FONTANA, Daniela
1999

Abstract

In the Miocene of the northern Apennines, methane-derived limestones from various geologic settings represent important examples of fossil chemoherms and provide a basis for more accurate interpretations of seepage systems. The systematic study of fossil chemoherms has allowed the definition of new field and compositional criteria for the recognition of these deposits, which were previously based almost exclusively on negative carbon isotope composition and peculiar chemosynthetic communities; this has constrained the relations between seepage and sedimentary and tectonic instability processes. We suggest that the peculiar brecciated structures associated with fossil chemoherms are related to diapirism or overpressured pelitic sediments due to fluid venting. Fluidization of sediments increases the instability of mudstones in which chemoherms are contained, thus favoring gravity slumping processes and the reworking of many chemoherms.
1999
27(10)
927
930
Miocene chemoherms of the northern Apennines, Italy / Conti, Stefano; Fontana, Daniela. - In: GEOLOGY. - ISSN 0091-7613. - STAMPA. - 27(10):(1999), pp. 927-930.
Conti, Stefano; Fontana, Daniela
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/612970
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