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In situ Rb-Sr datin...
In situ Rb-Sr dating of slickenfibres in deep crystalline basement faults
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- Tillberg, Mikael (author)
- Gothenburg University,Göteborgs universitet,Linnéuniversitetet,Institutionen för biologi och miljö (BOM),University of Gothenburg, Sweden,Institutionen för geovetenskaper,Department of Earth Sciences
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- Drake, Henrik, Docent, 1979- (author)
- Linnéuniversitetet,Institutionen för biologi och miljö (BOM),Vatten
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- Zack, Thomas, 1968 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för geovetenskaper,Department of Earth Sciences
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- Kooijman, Ellen (author)
- Naturhistoriska riksmuseet,Enheten för geovetenskap
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- Whitehouse, Martin J. (author)
- Naturhistoriska riksmuseet,Enheten för geovetenskap
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- Åström, Mats E., 1963- (author)
- Linnéuniversitetet,Institutionen för biologi och miljö (BOM),Vatten
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(creator_code:org_t)
- 2020-01-17
- 2020
- English.
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In: Scientific Reports. - : Nature Publishing Group. - 2045-2322. ; 10:1, s. 1-12
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
Keyword
- Natural Science
- Naturvetenskap
- The changing Earth
Publication and Content Type
- ref (subject category)
- art (subject category)
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