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Constraining long-t...
Constraining long-term fault activity in the brittle domain through in situ dating of hydrothermal monazite
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Bergemann, Christian A. (author)
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Gnos, Edwin (author)
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Berger, Alfons (author)
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- Whitehouse, Martin J., 1962- (author)
- Naturhistoriska riksmuseet,Enheten för geovetenskap,Nordsim
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Mullis, Josef (author)
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Walter, Franz (author)
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Bojar, Hans-Peter (author)
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(creator_code:org_t)
- 2018-11-06
- 2018
- English.
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In: Terra Nova. - : Wiley. - 0954-4879. ; 30:6, s. 440-446
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https://doi.org/10.1...
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Abstract
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- Abstract SIMS ThâPb dating of hydrothermal fissure-vein monazite-(Ce) has the unique potential to date multiple tectonic events under low-grade metamorphic brittle/ductile conditions over large time frames. Monazites-(Ce) from brittle fault systems in the Eastern Alps allow us to constrain their Cretaceous activity over 20 Ma within single crystals, recording all major tectonic events. Eo-Alpine formation of the fluid-filled fissure-veins occurred 90 Ma ago at 352 ± 19°C and 342 ± 42 MPa. This corresponds to peak conditions during regional metamorphism of the Cretaceous collisional nappe stacking. Several stages of dissolutionâreprecipitation/recrystallization record fault activity between 84 and 70 Ma. Corresponding fluid inclusions indicate conditions of 229 ± 10°C and 143 ± 20 MPa. This correlates with the formation of sedimentary basins during post-orogenic extension associated with strike-slip movements. The results strengthen the hypothesis that many large fault systems in the Eastern Alps developed during the Cretaceous orogeny and became reactivated during Neogene Alpine tectonics.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Keyword
- The changing Earth
- Den föränderliga jorden
Publication and Content Type
- ref (subject category)
- art (subject category)
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