Dating fault reactivation by Ar/Ar laserprobe: an alternative view of apparently cogenetic mylonite–pseudotachylite assemblages

Sherlock, Sarah C.; Watts, L.M.; Holdsworth, R. E.; Roberts, David L.

doi:10.1144/0016-764903-160

Cited by 35 publications

(23 citation statements)

References 24 publications

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“…Sinistral shearing along the Møre-Trøndelag Fault Complex could have been roughly contemporaneous with denudation of the Central Norway basement window in the footwall of the HDZ, as suggested by Séranne (1992), and probably of Early to Mid-Devonian age. Supporting this model is an 40 Ar/ 39 Ar white mica age of 406 AE 11 Ma reported from the mylonites of the Møre-Trøndelag Fault Complex by Sherlock et al (2004).…”

Section: Brittle Extension Contraction and The Role Of The Møre-trønmentioning

confidence: 80%

“…Epidote-mineralized oblique, normal and strikeslip faults demonstrably cut deformation products associated with the Høybakken detachment fault, such as the pink cataclasite developed from the Eidsfjellet granite that yielded the c. 320 Ma K-feldspar age reported by Kendrick et al (2004). This deformation may be related to the Late Carboniferous-Early Permian movements along the Hitra-Snåsa Fault recorded by Watts (2001) and Sherlock et al (2004). 2004) along the Hitra-Snåsa Fault. Thus it appears that a principal trend of shortening remained at right angles to the Møre-Trøndelag Fault Complex from the Early Devonian and at least into Mid-and Late Devonian time.…”

Section: Brittle Extension Contraction and The Role Of The Møre-trønmentioning

confidence: 86%

“…Ar/ Ar K feldspar, cataclasite, HDF (Kendrick et al 2004) 40 39 406 11 + Ar/ Ar muscovite age, sinistral, ductile shear zone along northeastern HSF (Sherlock et al 2004) Ar/ Ar muscovite ages from the CNBW (Dallmeyer et al 1992) 417+5 U/Pb zircon age, pre-kinematic felsic dyke Lysøysund (Bingen et al 2003(Bingen et al , 2005. …”

Section: +3mentioning

confidence: 99%

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Kinematics of the Høybakken detachment zone and the Møre–Trøndelag Fault Complex, central Norway

Osmundsen

Eide

Haabesland

et al. 2006

JGS

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The tectonic disintegration of the Caledonian orogen through combined extension, contraction and strike-slip was characterized by spatial and temporal strain partitioning through a period of at least 30 Ma. Early to Mid-Devonian exhumation of the Central Norway basement window was associated with retrograde, top-to-the-SW extensional shearing in the Høybakken detachment zone, sinistral shearing along the Møre-Trøndelag Fault Complex, and formation of extension-parallel folds. Progressive exhumation led to increasing strain localization and to the transition from ductile to brittle deformation. In the interval between c. 370 and 320 Ma, the Høybakken detachment fault cut previously folded detachment mylonites, capturing mylonites in its hanging wall. 40 Ar/ 39 Ar mica and K-feldspar ages indicate a Late Devonian or younger age for the uppermost parts of the adjacent 'Old Red' basin. Gentle folding of this stratigraphic level attests to the continuation of shortening and orogen-oblique extension into Late Devonian-Carboniferous time. Shortening was intensified along strands of the Møre-Trøndelag Fault Complex, as shown by mutually cross-cutting reverse and strike-slip faults. 'Flower structures' may be particularly common in constrictional strain systems where strike-slip faults develop parallel to the principal elongation trend, but normal to the principal axis of shortening.

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Section: Brittle Extension Contraction and The Role Of The Møre-trønmentioning

confidence: 80%

Section: Brittle Extension Contraction and The Role Of The Møre-trønmentioning

confidence: 86%

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Kinematics of the Høybakken detachment zone and the Møre–Trøndelag Fault Complex, central Norway

Osmundsen

Eide

Haabesland

et al. 2006

JGS

Self Cite

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“…Main phases of activity include early Devonian sinistral strike-slip, early Permian sinistral transtension, late Jurassic normal to dextral strike-slip faulting (Grønlie and Roberts, 1989;Séranne, 1992;Sherlock et al, 2004) and, presumably, Cenozoic normal dip-slip (Redfield et al, 2005b). These phases reflect the collapse of the Caledonian mountain chain, widespread Permian rifting, late Jurassic rifting of the northern North Sea and the mid Norway margin (Gabrielsen et al, 1999) and Cenozoic uplift of the Norwegian mountains while offshore basins were subsiding (Faleide et al, 2002;Redfield et al, 2005b).…”

Section: Geological Settingmentioning

confidence: 99%

High resolution reflection seismic profiling over the Tjellefonna fault in the Møre-Trøndelag Fault Complex, Norway

2012

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Abstract. The Møre-Trøndelag Fault Complex (MTFC) is one of the most prominent fault zones of Norway, both onshore and offshore. In spite of its importance, very little is known of the deeper structure of the individual fault segments comprising the fault complex. Most seismic lines have been recorded offshore or focused on deeper structures. This paper presents results from two reflection seismic profiles, located on each side of the Tingvollfjord, acquired over the Tjellefonna fault in the southeastern part of the MTFC. Possible kilometer scale vertical offsets, reflecting large scale northwest-dipping normal faulting, separating the high topography to the southeast from lower topography to the northwest have been proposed for the Tjellefonna fault or the Baeverdalen lineament. In this study, however, the Tjellefonna fault is interpreted to dip approximately 50-60 • towards the southeast to depths of at least 1.3 km. Travel-time modeling of reflections associated with the fault was used to establish the geometry of the fault structure at depth, while detailed analysis of first P-wave arrivals in shot gathers, together with resistivity profiles, were used to define the near surface geometry of the fault zone. A continuation of the structure on the northeastern side of the Tingvollfjord is suggested by correlation of an in strike direction P-S converted reflection (generated by a fracture zone) seen on the reflection data from that side of the Tingvollfjord. The reflection seismic data correlate well with resistivity profiles and recently published near surface geophysical data. A highly reflective package forming a gentle antiform structure was also identified on both seismic profiles. This structure could be related to the folded amphibolite lenses seen on the surface or possibly by an important boundary within the gneissic basement rocks of the Western Gneiss Region. The fold hinge line of the structure is parallel with the Tjellefonna fault trace suggesting that the folding and faulting may have been related.

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“…To date, only a few studies have constrained the time interval between fault formation and reactivation using geochronological methods. For instance, Ar-Ar muscovite dating on mylonites and pseudotachylites from the Møre-Trøndelag Fault, Norway, has revealed that brittle deformation post-dated mylonitization by c. 100 Ma (Sherlock et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Age constraints on faulting and fault reactivation: a multi-chronological approach

Siebel¹,

Hann²,

Danišík

et al. 2009

Int J Earth Sci (Geol Rundsch)

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Movement within the Earth's upper crust is commonly accommodated by faults or shear zones, ranging in scale from micro-displacements to regional tectonic lineaments. Since faults are active on different time scales and can be repeatedly reactivated, their displacement chronology is difficult to reconstruct. This study represents a multi-geochronological approach to unravel the evolution of an intracontinental fault zone locality along the Danube Fault, central Europe. At the investigated fault locality, ancient motion has produced a cataclastic deformation zone in which the cataclastic material was subjected to hydrothermal alteration and K-feldspar was almost completely replaced by illite and other phyllosilicates. Five different geochronological techniques (zircon Pb-evaporation, K-Ar and Rb-Sr illite, apatite fission track and fluorite (U-Th)/He) have been applied to explore the temporal fault activity. The upper time limit for initiation of faulting is constrained by the crystallization age of the primary rock type (known as ''Kristallgranit'') at 325 ± 7 Ma, whereas the K-Ar and Rb-Sr ages of two illite fractions \2 lm (266-255 Ma) are interpreted to date fluid infiltration events during the final stage of the cataclastic deformation period. During this time, the ''Kristallgranit'' was already at or near the Earth's surface as indicated by the sedimentary record and thermal modelling results of apatite fission track data. (U-Th)/He thermochronology of two single fluorite grains from a fluorite-quartz vein within the fault zone yield Cretaceous ages that clearly postdate their Late-Variscan mineralization age. We propose that later reactivation of the fault caused loss of helium in the fluorites. This assertion is supported by geological evidence, i.e. offsets of Jurassic and Cretaceous sediments along the fault and apatite fission track thermal modelling results are consistent with the prevalence of elevated temperatures (50-80°C) in the fault zone during the Cretaceous.

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Dating fault reactivation by Ar/Ar laserprobe: an alternative view of apparently cogenetic mylonite–pseudotachylite assemblages

Cited by 35 publications

References 24 publications

Kinematics of the Høybakken detachment zone and the Møre–Trøndelag Fault Complex, central Norway

Kinematics of the Høybakken detachment zone and the Møre–Trøndelag Fault Complex, central Norway

High resolution reflection seismic profiling over the Tjellefonna fault in the Møre-Trøndelag Fault Complex, Norway

Age constraints on faulting and fault reactivation: a multi-chronological approach

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