Crack-seal microstructure evolution in bi-mineralic quartz–chlorite veins in shales and siltstones from the RWTH-1 well, Aachen, Germany

Becker, Simon; Hilgers, Christoph; Kukla, Peter A.; Urai, János L.

doi:10.1016/j.jsg.2011.01.001

Cited by 22 publications

(14 citation statements)

References 49 publications

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“…Bent chlorite crystals indicate syntectonic growth ). Becker et al (2011) describe cross-cutting veins from the upper section of the RWTH well with similar microstructures and mineralogy that formed at episodic microfracturing events during progressive shearing and vein formation in one single tectonic episode. Multiple reopening of fractures and episodic vein filling is documented by bands of rock fragment along vein margins (Lögering 2008).…”

Section: Regional Geology and Fluid Evolutionmentioning

confidence: 89%

“…3). Evidence of tectonic processes causing absence of strata is not observed (Becker 2008;Becker et al 2011). Reasons for gaps in the stratigraphic column are sedimentary hiati that are also reported from other areas of the western Rhenohercynian (Ribbert 2006).…”

Section: Regional Geology and Fluid Evolutionmentioning

confidence: 97%

“…Voids and joints are sealed by quartz, carbonates and chlorite that precipitated from a hydrothermal fluid. Further information on various aspects of the RWTH-1 well are given in Becker (2008), Becker et al (2011), Lögering (2008, Sindern et al (2007Sindern et al ( , 2008, Trautwein-Bruns et al (2007.…”

Section: Regional Geology and Fluid Evolutionmentioning

confidence: 99%

“…Multiple reopening of fractures and episodic vein filling is documented by bands of rock fragment along vein margins (Lögering 2008). Other vein textures are indicative of crack-seal processes (Becker et al 2011;Chatziliadou 2009;Lögering 2008).…”

Section: Regional Geology and Fluid Evolutionmentioning

confidence: 99%

“…LCL denotes lower Carboniferous limestones occurring to the SE of Aachen (Chatziliadou 2009) and PVV indicates isotopic signatures of post-Variscan vein calcites from Hastenrath and Bleiberg situated only few kilometres to the SE and SW of Aachen (Chatziliadou 2009;Muchez et al 1994). The field of sedimentary carbonates is from Hudson (1977) and Baker and Fallick (1989), the field (MVT) showing the isotope signatures of calcite from Mississippi-ValleyType deposits is from Richardson et al (1988) Bowers and Helgeson (1985) implemented in the MacFlinCor software (Brown 1989) was applied to be syntectonic (Becker et al 2011;Sindern et al 2007) was driven by fault-valve action during Variscan thrusting and compression. The latter process involves fast fluid movement and little heat loss even over several tens of kilometres of distance (Clendenin and Duane 1990).…”

Section: Fluid Sources and Migrationmentioning

confidence: 99%

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Fluid evolution at the Variscan front in the vicinity of the Aachen thrust

Синдерн

Meyer

Lögering

et al. 2011

Int J Earth Sci (Geol Rundsch)

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Quartz-carbonate-chlorite veins were studied in borehole samples of the RWTH-1 well in Aachen. Veins formed in Devonian rocks in the footwall of the Aachen thrust during Variscan deformation and associated fluid flow. Primary fluid inclusions indicate subsolvus unmixing of a homogenous H 2 O-CO 2 -CH 4 -(N 2 )-Na-(K)-Cl fluid into a H 2 O-Na-(K)-Cl solution and a vapour-rich CO 2 -(H 2 O, CH 4 , N 2 ) fluid. The aqueous end-member composition resembles that of metamorphic fluids of the Variscan front zone with salinities ranging from 4 to 7% NaCl equiv. and maximum homogenisation temperatures of close to 400°C. Pressure estimates indicate a burial depth between 4,500 and 8,000 m at geothermal gradients between 50 and 75°C/26 MPa, but pressure decrease to sublithostatic conditions is also indicated, probably as a consequence of fracture opening during episodic seismic activity. A second fluid system, mainly preserved in pseudo-secondary and secondary fluid inclusions, is characterised by fluid temperatures between 200 and 250°C and salinities of \5% NaCl equiv. Bulk stable isotope analyses of fluids released from vein quartz, calcite, and dolomite by decrepitation yielded dD H2O values from -89 to -113 %, d 13 C CH4 from -26.9 to -28.9% (VPDB) and d 13 C CO2 from -12.8 to -23.3% (VPDB). The low dD and d 13 C range of the fluids is considered to be due to interaction with cracked hydrocarbons. The second fluid influx caused partial isotope exchange and disequilibrium. It is envisaged that an initial short lived flux of hot metamorphic fluids expelled from the epizonal metamorphic domains of the Stavelot-Venn massif. The metamorphic fluid was focused along major thrust faults of the Variscan front zone such as the Aachen thrust. A second fluid influx was introduced from formation waters in the footwall of the Aachen thrust as a consequence of progressive deformation. Mixing of the cooler and lower salinity formation water with the hot metamorphic fluid during episodic fluid trapping resulted in an evolving range of physicochemical fluid inclusion characteristics.

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Section: Regional Geology and Fluid Evolutionmentioning

confidence: 89%

Section: Regional Geology and Fluid Evolutionmentioning

confidence: 97%

Section: Regional Geology and Fluid Evolutionmentioning

confidence: 99%

Section: Regional Geology and Fluid Evolutionmentioning

confidence: 99%

Section: Fluid Sources and Migrationmentioning

confidence: 99%

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Fluid evolution at the Variscan front in the vicinity of the Aachen thrust

Синдерн

Meyer

Lögering

et al. 2011

Int J Earth Sci (Geol Rundsch)

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Microstructural evolution in bitaxial crack‐seal veins: A phase‐field study

2015

Self Cite

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Bitaxial crack sealing by epitaxial crystal growth is the most common vein‐forming process in Earth's crust, but the details of the microstructural processes in these are not well understood. Here we model the evolution of bitaxial crack‐seal quartz veins in two and three dimensions, using the phase‐field method. Our numerical simulations show the influence of different parameters, such as the obliquity of crack opening and crack location, grain size, and orientations on the evolving vein microstructure. We examine the underlying growth competition observed during epitaxial growth of quartz. Results show many similarities with natural microstructures such as stretched crystals and compare well with the previous numerical findings. As the ratio of crack aperture and matrix grain size for the present studies is chosen to be sufficiently large for growth competition to occur before complete sealing, it leads to the formation of crystal fragments along the crack‐opening trajectory. We explain how such fragment trails act as potential indicators of the opening of crack‐seal veins, if they are confirmed to be common in natural microstructures. Finally, we highlight the importance of accounting for the third dimension in the numerical simulations by analyzing the evolution of fluid connectivity in 2‐D and 3‐D during the sealing process.

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Mechanics of Crack Sealing with Fluid Flow in the Plate Boundary

Toriumi

2022

Geochemical Mechanics and Deep Neural Network Modeling

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Crack-seal microstructure evolution in bi-mineralic quartz–chlorite veins in shales and siltstones from the RWTH-1 well, Aachen, Germany

Cited by 22 publications

References 49 publications

Fluid evolution at the Variscan front in the vicinity of the Aachen thrust

Fluid evolution at the Variscan front in the vicinity of the Aachen thrust

Microstructural evolution in bitaxial crack‐seal veins: A phase‐field study

Mechanics of Crack Sealing with Fluid Flow in the Plate Boundary

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