Boron metasomatism in the Brabant Massif (Belgium): Geochemical and petrographical evidence of Devonian tourmalinite pebbles

Corteel, Cedric; Paepe, Paul De

doi:10.1017/s0016774600020746

Cited by 2 publications

(2 citation statements)

References 24 publications

(29 reference statements)

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“…[]) as a distributed conduit at shallow levels, transitioning to a combined conduit‐barrier to hydrous and boron‐rich fluids at depths approaching the FVTZ. Boron within the tourmaline was likely sourced from the metasedimentary lithologies, as recognized in other metasomatic intrusive settings [e.g., Corteel and De Paepe , ]. Precipitation of tourmaline ± quartz veins and travertine within this system acted to occlude permeability, leading to elevated pore fluid pressures, and resulting in hydrofracture.…”

Section: Discussion: Fault Weakening Mechanisms and Their Tectonic Simentioning

confidence: 98%

Fault weakening across the frictional‐viscous transition zone, Karakoram Fault Zone, NW Himalaya

2013

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[1] Exhumed fault rocks formed in the frictional-viscous transition zone (FVTZ) provide test material that can be used to assess the strength of natural fault zones. In the Karakoram Fault Zone (KFZ), such rocks contain evidence of several long-term weakening mechanisms associated with reduced coefficients of friction (<0.4). The Nubra, Tangtse, and Arganglas strands of the KFZ are focused along metavolcano-sedimentary formations indicating weakness relative to the bounding granitoids. Synkinematic retrogression suggests that reaction softening has weakened the margins of granitoids along the Nubra and Tangtse strands and the Nubra Formation within the Nubra strand. The resultant phyllosilicates have formed well-developed interconnected weak layers within phyllonites and granitic mylonites. Micaceous foliae with increased proportions of opaque minerals in granitic mylonites suggest that fluid-assisted diffusive mass transfer aided deformation within the Nubra and Tangtse strands. Microstructures within Nubra strand phyllonites suggest that frictional-viscous flow accommodated deformation at low shear stresses in the FVTZ. Multiple generations of veining within each strand indicate overpressured pore fluids within the fault zone across a range of depths. Active springs and travertines along the fault indicate ongoing suprahydrostatic fluid flow within the KFZ. Despite such evidence for weakening mechanisms, the KFZ is currently locked and most likely generates moment magnitude 7.5+ earthquakes. Evidence for multiple fault weakening mechanisms reduces potential for shear heating within the KFZ and suggests that the long-term strength of the lithosphere must reside below the depth of penetration of the fault.

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Section: Discussion: Fault Weakening Mechanisms and Their Tectonic Simentioning

confidence: 98%

Fault weakening across the frictional‐viscous transition zone, Karakoram Fault Zone, NW Himalaya

2013

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“…The Emsian shows a marked regressive trend, with fluvio-littoral environments prograding southward at the expense of the marine facies. The most spectacular unit is the deltaic Burnot Formation, which includes several hundred metres of red conglomerates, sandstones, and siltstones (Corteel and De Paepe 2003).…”

Section: 7)mentioning

confidence: 99%

An Introduction to the Geology of Belgium and Luxembourg

Boulvain

Vandenberghe

2017

World Geomorphological Landscapes

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Belgium and the Grand-Duchy of Luxembourg show surprising geological diversity over their small combined area of 33,114 km 2 . Almost all types of sedimentary rocks crop out and are generally preserved along well-described and easily accessible sections or in quarries. Several sections are known worldwide and are visited for stratigraphic or sedimentological purposes. Magmatic rocks are not abundant and metamorphic rocks are restricted to slates. The stratigraphic scale ranges from the Cambrian to the Quaternary, which translates to a half billion years of Earth history. This chapter provides a comprehensive overview of the different stratigraphic units, starting from the oldest and ending with the youngest. Modern stratigraphic schemes highlight formations' geometries and interrelations. Some of the most remarkable units are further detailed. The two orogenic phases that shaped the Lower Paleozoic inliers and the Devonian-Carboniferous faulted and folded belt, i.e. the Caledonian and Variscan orogeny, are also addressed.

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Boron metasomatism in the Brabant Massif (Belgium): Geochemical and petrographical evidence of Devonian tourmalinite pebbles

Cited by 2 publications

References 24 publications

Fault weakening across the frictional‐viscous transition zone, Karakoram Fault Zone, NW Himalaya

Fault weakening across the frictional‐viscous transition zone, Karakoram Fault Zone, NW Himalaya

An Introduction to the Geology of Belgium and Luxembourg

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