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In situ Rb-Sr dating of slickenfibres in deep crystalline basement faults
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. University of Gothenburg, Sweden.
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.ORCID iD: 0000-0001-7230-6509
University of Gothenburg, Sweden.
Swedish Museum of Natural History, Sweden.
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2020 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 10, p. 1-12, article id 562Article in journal (Refereed) Published
Abstract [en]

Establishing temporal constraints of faulting is of importance for tectonic and seismicity reconstructions and predictions. Conventional fault dating techniques commonly use bulk samples of syn-kinematic illite and other K-bearing minerals in fault gouges, which results in mixed ages of repeatedly reactivated faults as well as grain-size dependent age variations. Here we present a new approach to resolve fault reactivation histories by applying high-spatial resolution Rb-Sr dating to fine-grained mineral slickenfibres in faults occurring in Paleoproterozoic crystalline rocks. Slickenfibre illite and/or K-feldspar together with co-genetic calcite and/or albite were targeted with 50 µm laser ablation triple quadrupole inductively coupled plasma mass spectrometry analyses (LA-ICP-MS/MS). The ages obtained disclose slickenfibre growth at several occasions spanning over 1 billion years, from at least 1527 Ma to 349 ± 9 Ma. The timing of these growth phases and the associated structural orientation information of the kinematic indicators on the fracture surfaces are linked to far-field tectonic events, including the Caledonian orogeny. Our approach links faulting to individual regional deformation events by minimizing age mixing through micro-scale analysis of individual grains and narrow crystal zones in common fault mineral assemblages.

Place, publisher, year, edition, pages
Nature Publishing Group, 2020. Vol. 10, p. 1-12, article id 562
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Earth and Related Environmental Sciences
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Natural Science
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URN: urn:nbn:se:lnu:diva-91835DOI: 10.1038/s41598-019-57262-5OAI: oai:DiVA.org:lnu-91835DiVA, id: diva2:1391394
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Swedish Research Council Formas, 2017-00766Swedish Research Council, 2017-05186Available from: 2020-02-04 Created: 2020-02-04 Last updated: 2020-02-21Bibliographically approved

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Tillberg, MikaelDrake, HenrikÅström, Mats E.
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