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Palaeocene faulting in SE Sweden from U-Pb dating of slickenfibre calcite
Stockholm University, Faculty of Science, Department of Geological Sciences. Lund University, Sweden.ORCID iD: 0000-0002-2068-7490
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Number of Authors: 52017 (English)In: Terra Nova, ISSN 0954-4879, E-ISSN 1365-3121, Vol. 29, no 5, p. 321-328Article in journal (Refereed) Published
Abstract [en]

Estimating the timing of faulting is crucial to modelling tectonics, palaeoseismicity, landscape evolution and fault mechanics. Four slickenfibre calcite samples from a conjugate strike-slip fault set in a platformal limestone, SE Sweden, were dated using U-Pb. Three of the samples yielded an average age of 64.8 +/- 6.5Ma, while the fourth yielded a marginally younger age of 54.7 +/- 5.5Ma. Precipitation of the fibres is interpreted as syn-deformational. Age uncertainty and dispersion reflect incorporation of common Pb and tiny host-rock components into the dated calcite and/or possible fault reactivation through ca. 55Ma. We infer from crystal characteristics, stable isotopes (O-18 and C-13) and rare-earth elements that fibres formed in an environment rich in deep-seated fluids, at temperatures of 40-200 degrees C, with shear stresses exceeding 10 MPa and at a maximum burial depth of c. 4km. This Palaeocene faulting may reflect far-field stresses from shortening in the Alps.

Place, publisher, year, edition, pages
2017. Vol. 29, no 5, p. 321-328
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Earth and Related Environmental Sciences
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URN: urn:nbn:se:su:diva-147863DOI: 10.1111/ter.12280ISI: 000411115800007OAI: oai:DiVA.org:su-147863DiVA, id: diva2:1153088
Available from: 2017-10-27 Created: 2017-10-27 Last updated: 2017-10-27Bibliographically approved

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