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Exhumation of the H...
Exhumation of the High-Pressure Tsakkok Lens, Swedish Caledonides : Insights From the Structural and White Mica(40)Ar/Ar-39 Geochronological Record
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- Barnes, C. J. (författare)
- AGH Univ Sci & Technol, Fac Geol Geophys & Environm Protect, Krakow, Poland.
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- Jeanneret, Pauline (författare)
- Uppsala universitet,Mineralogi, petrologi och tektonik,Univ Bourgogne Franche Comte, Lab Chronoenvironm, Besancon, France.
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- Kullerud, K. (författare)
- Univ Tromso, Dept Geol, Tromso, Norway.;Norwegian Min Museum, Kongsberg, Norway.
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- Majka, Jaroslaw (författare)
- Uppsala universitet,Mineralogi, petrologi och tektonik,AGH Univ Sci & Technol, Fac Geol Geophys & Environm Protect, Krakow, Poland.
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- Schneider, D. A. (författare)
- Univ Ottawa, Dept Earth & Environm Sci, Ottawa, ON, Canada.
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- Bukala, M. (författare)
- AGH Univ Sci & Technol, Fac Geol Geophys & Environm Protect, Krakow, Poland.
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- Klonowska, I (författare)
- AGH Univ Sci & Technol, Fac Geol Geophys & Environm Protect, Krakow, Poland.
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AGH Univ Sci & Technol, Fac Geol Geophys & Environm Protect, Krakow, Poland Mineralogi, petrologi och tektonik (creator_code:org_t)
- American Geophysical Union (AGU), 2020
- 2020
- Engelska.
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Ingår i: Tectonics. - : American Geophysical Union (AGU). - 0278-7407 .- 1944-9194. ; 39:7
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Integrated structural, geochemical, and geochronological investigations were conducted on metasedimentary rocks in the eclogite-bearing Tsakkok Lens of the Seve Nappe Complex (Scandinavian Caledonides) to resolve its exhumation history. Three deformation events are defined. D1 is likely related to the prograde to peak-metamorphic stages, represented by a locally preserved S1. D2 resulted in vertical shortening and is defined by a pervasive S2 and cm-/m-scale F2 closed folds. D2 terminated with Scandian thrusting, which emplaced the overlying Koli Nappe Complex. D3 records NE-SW shortening and constitutes m-/km-scale F3 open folds that deformed the Tsakkok Lens and Koli Nappe Complex together. In situ white mica(40)Ar/Ar-39 geochronology was conducted on select metasedimentary samples possessing S1 or S2 to resolve the timing of exhumation. Postdecompression cooling of the Tsakkok Lens is best recorded by samples containing S1 or S2 that yield homogeneous white mica chemistry and(40)Ar/Ar-39 dates. The timing of cooling is resolved to 477.2 +/- 4.1 Ma (S1) and 475.3 +/- 3.5 Ma (S2). Vertical shortening of the lens during exhumation may have proceeded until 458.1 +/- 9.0 Ma. Later-stage deformation during Scandian thrusting penetrated the Tsakkok Lens at 429.9 +/- 9.0 Ma, or younger. This resulted in noncoaxial deformation of the metasedimentary rocks, producing heterogeneous white mica chemistry and partially reset the older(40)Ar/Ar-39 cooling record. Temperatures for deformation are resolved to the upper greenschist-lower amphibolite facies. Altogether, the Tsakkok Lens records rapid exhumation from eclogite-facies conditions to midcrustal depths or shallower, followed by emplacement of the overlying Koli Nappe Complex.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Nyckelord
- Caledonian orogeny
- Seve Nappe complex
- in situ white mica(40)Ar
- Ar-39 geochronology
- exhumation of high-pressure rocks
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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