Advanced

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 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.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Terra Nova
volume
29
issue
5
pages
8 pages
publisher
Wiley-Blackwell
external identifiers
  • scopus:85029601991
  • wos:000411115800007
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
2018-05-29 10:08:16
@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},
  title        = {Palaeocene faulting in SE Sweden from U–Pb dating of slickenfibre calcite},
  url          = {http://dx.doi.org/10.1111/ter.12280},
  volume       = {29},
  year         = {2017},
}