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Palaeocene faulting in SE Sweden from U–Pb dating of slickenfibre calcite

Goodfellow, Bradley W. LU ; Viola, Giulio ; Bingen, Bernard ; Nuriel, Perach and Kylander-Clark, Andrew R.C. (2017) In Terra Nova: the European journal of geosciences 29(5). p.321-328
Abstract

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 ± 6.5 Ma, while the fourth yielded a marginally younger age of 54.7 ± 5.5 Ma. 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. 55 Ma. We infer from crystal characteristics, stable isotopes (δ18O and δ13C) and rare-earth elements... (More)

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 ± 6.5 Ma, while the fourth yielded a marginally younger age of 54.7 ± 5.5 Ma. 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. 55 Ma. We infer from crystal characteristics, stable isotopes (δ18O and δ13C) and rare-earth elements that fibres formed in an environment rich in deep-seated fluids, at temperatures of 40–200°C, with shear stresses exceeding 10 MPa and at a maximum burial depth of c. 4 km. This Palaeocene faulting may reflect far-field stresses from shortening in the Alps.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Terra Nova: the European journal of geosciences
volume
29
issue
5
pages
8 pages
publisher
Wiley-Blackwell
external identifiers
  • wos:000411115800007
  • scopus:85029601991
ISSN
0954-4879
DOI
10.1111/ter.12280
language
English
LU publication?
yes
id
f9492ec8-785c-422b-a2b9-d9906798fc35
date added to LUP
2017-09-29 08:52:29
date last changed
2024-02-29 22:32:02
@article{f9492ec8-785c-422b-a2b9-d9906798fc35,
  abstract     = {{<p>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 ± 6.5 Ma, while the fourth yielded a marginally younger age of 54.7 ± 5.5 Ma. 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. 55 Ma. We infer from crystal characteristics, stable isotopes (δ<sup>18</sup>O and δ<sup>13</sup>C) and rare-earth elements that fibres formed in an environment rich in deep-seated fluids, at temperatures of 40–200°C, with shear stresses exceeding 10 MPa and at a maximum burial depth of c. 4 km. This Palaeocene faulting may reflect far-field stresses from shortening in the Alps.</p>}},
  author       = {{Goodfellow, Bradley W. and Viola, Giulio and Bingen, Bernard and Nuriel, Perach and Kylander-Clark, Andrew R.C.}},
  issn         = {{0954-4879}},
  language     = {{eng}},
  month        = {{10}},
  number       = {{5}},
  pages        = {{321--328}},
  publisher    = {{Wiley-Blackwell}},
  series       = {{Terra Nova: the European journal of geosciences}},
  title        = {{Palaeocene faulting in SE Sweden from U–Pb dating of slickenfibre calcite}},
  url          = {{http://dx.doi.org/10.1111/ter.12280}},
  doi          = {{10.1111/ter.12280}},
  volume       = {{29}},
  year         = {{2017}},
}