Interpretation of fluid inclusions in quartz deformed by weak ductile shearing: Reconstruction of differential stress magnitudes and pre-deformation fluid properties

Diamond, Larryn W.; Tarantola, Αlexandre

doi:10.1016/j.epsl.2015.02.019

Cited by 55 publications

(30 citation statements)

References 47 publications

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“…Relatively high differential stresses are expected for initiation of shear bands via cracking at stage I. For our averaged P‐T estimates, the yielding differential stress can be up to 250 MPa as reported from experiments on cracking of quartz single crystals [ Tarantola et al , ; Diamond and Tarantola , ]. Dynamic recrystallization of quartz via dislocation creep in the vicinity of microcracks and shear bands at stage II allowed us to evaluate stresses and strain rates by using the recrystallized quartz grains paleopiezometer of Stipp and Tullis [], corrected after Holyoke and Kronenberg [], and the flow law of Paterson and Luan [] (combination of flow laws and piezometers after Boutonnet et al []).…”

Section: Discussionmentioning

confidence: 99%

Major softening at brittle‐ductile transition due to interplay between chemical and deformation processes: An insight from evolution of shear bands in the South Armorican Shear Zone

2016

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The formation of S‐C/C′ fabrics in the South Armorican Shear Zone has been evaluated by detailed microstructural study where the focus was given to initiation and early evolution of the C/C′ fabric shear bands. Our observations suggest that the S‐C/C′ fabrics formed at distinct temperature conditions indicating >550°C for the S fabric and 300–350°C at 100–400 MPa for the C/C′ fabric shear bands. The evolving microstructure within shear bands documents switches in deformation mechanisms related to positive feedbacks between deformation and chemical processes and imposes mechanical constraints on the evolution of the brittle‐ductile transition in the continental transform fault domains. Three stages of shear band evolution have been identified. Stage I corresponds to initiation of shear bands via formation of microcracks with possible yielding differential stress of up to 250 MPa. Stage II is associated with subgrain rotation recrystallization and dislocation creep of quartz and coeval dissolution‐precipitation creep of microcline. Recrystallized quartz grains show continual increase in size and decrease in stress and strain rates from 94 MPa to 17–26 MPa and 3.8 × 10−12 s−1–8 × 10−14 s−1 associated with deformation partitioning into weaker microcline layer and shear band widening. The quartz mechanical data allowed us to set some constrains for coeval dissolution‐precipitation of microcline which at our estimated pressure‐temperature conditions suggests creep at 17–26 MPa differential stress and 3.8 × 10−13 s−1 strain rate. Stage III is characterized by localized slip along white mica bands accommodated by dislocation creep at strain rate 3.8 × 10−12 s−1 and stress 9.36 MPa. Our mechanical data point to dynamic evolution of the studied brittle‐ductile transition characterized by major weakening to strengths ~10 MPa. Such nonsteady state evolution may be common in crustal shear zones especially when phase transformations are involved.

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Section: Discussionmentioning

confidence: 99%

Major softening at brittle‐ductile transition due to interplay between chemical and deformation processes: An insight from evolution of shear bands in the South Armorican Shear Zone

2016

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“…At room temperature, the carbonic phase (a car ) is around 80 vol.% and dominated by carbonic liquid. Type Ia are (i) dismembered ( Fig.3c; Diamond et al, 2010;Tarantola et al, 2010Tarantola et al, , 2012Diamond and Tarantola, 2015), (ii) accumulated along quartz subgrain boundaries (Fig.3c;Kerrich, 1976;Wilkins and Barkas, 1978), (iii) distributed as 'en-echelon'…”

Section: Fluid Inclusion Petrographymentioning

confidence: 98%

“…Fluid production and flow in the Earth's crust can be reconstructed through careful microstructural and geochemical investigations of veins and fluid inclusions (e.g Küster and Stöckhert, 1997;Vapnik and Avigad, 2004;Eglinger et al, 2014;Diamond and Tarantola, 2015). Besides H 2 O, CO 2 is a dominant volatile phase commonly observed in metamorphic fluids (Roedder, 1984;Crawford and Hollister, 1986;Diamond, 2001;Kerrick and Connolly, 2001;Yardley and Bodnar, 2014).…”

Section: Introductionmentioning

confidence: 98%

CO 2 flow during orogenic gravitational collapse: Syntectonic decarbonation and fluid mixing at the ductile-brittle transition (Lavrion, Greece)

et al. 2017

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“…; Bodnar ; Diamond et al . ; Diamond & Tarantola ). Therefore, we only consider T h of intact inclusions with the smallest gas bubbles (flw > 65 vol %), resulting in a range from 220 to 355°C.…”

Section: Resultsmentioning

confidence: 99%

From deep to shallow fluid reservoirs: evolution of fluid sources during exhumation of the Sierra Almagrera, Betic Cordillera, Spain

et al. 2015

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Palaeo-fluids trapped in quartz and siderite-barite veins hosted by graphitic schists recorded the fluid and metal transfers during the Neogene exhumation of the Sierra Almagrera Metamorphic Core Complex. First quartz veins registered the ductile then brittle-ductile extensional shearing. The reservoir at that time was wetted by high-salinity fluids with a low density volatile phase resulting from the dissolved Triassic evaporites. Low salinity fluids occurred during the exhumation within the brittle domain as revealed by transgranular fluid inclusion planes affecting previous veins. This suggests an opening of the system and the penetration of surficial fluids from uplifted ranges during Serravalian to early Tortonian times.Transcurrent tectonics generated marine basins since late Tortonian. At depth quartz veins discordant to the foliation were associated to hematite indicating oxydizing conditions. A stop of the low-saline record is revealed by high-salinity Fe-rich fluids issued from the underlying metamorphic reservoir. The Messinian ongoing activity of the sinistral Trans-Alboran tectonovolcanic trend led to the formation of ore deposits.Reducing conditions and Fe-rich fluid led to the formation of siderite and pyrite. The subsequent formation of galena and barite under oxydizing conditions has been related to a probable increase of temperature. A higher salinity and the Cl/Br ratio indicate another source of secondary brine issued from dissolved Messinian evaporites as confirmed by δ This is a PREPRINT version (pre-refereeing) of the paper: Dyja, V., Hibsch, C., Tarantola, A., Cathelineau M., Boiron M.C., Marignac C, Bartier, D., Carrillo-Rosúa, J., Morales-Ruano, S., Boulvais, P. (2015). From deep to shallow fluid reservoirs: evolution of fluid sources during exhumation of the Sierra

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Interpretation of fluid inclusions in quartz deformed by weak ductile shearing: Reconstruction of differential stress magnitudes and pre-deformation fluid properties

Cited by 55 publications

References 47 publications

Major softening at brittle‐ductile transition due to interplay between chemical and deformation processes: An insight from evolution of shear bands in the South Armorican Shear Zone

Major softening at brittle‐ductile transition due to interplay between chemical and deformation processes: An insight from evolution of shear bands in the South Armorican Shear Zone

CO 2 flow during orogenic gravitational collapse: Syntectonic decarbonation and fluid mixing at the ductile-brittle transition (Lavrion, Greece)

From deep to shallow fluid reservoirs: evolution of fluid sources during exhumation of the Sierra Almagrera, Betic Cordillera, Spain

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