Experimental study and modeling of fluid reaction paths in the quartz–kyanite±muscovite–water system at 0.7GPa in the 350–550°C range: Implications for Al selective transfer during metamorphism

Verlaguet, Anne; Brunet, Fabrice; Goffé, Bruno; Murphy, William M.

doi:10.1016/j.gca.2005.12.014

Cited by 30 publications

(13 citation statements)

References 52 publications

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“…Previous studies (e.g., Verlaguet et al 2006) have shown that the amount of aluminum that can be transported in a metamorphic fluid using only Al hydroxide complexes is generally not sufficient to form the quartz-kyanite veins observed. Calculations applying simple empirical equations for Al (Tropper and Manning 2007) and SiO 2 (Manning 1994) solubility in metamorphic fluids predict a vein assemblage with 0.07 vol.% kyanite for isobaric cooling in the temperature range 600-500°C at 5 kbar.…”

Section: Mineral Solubility and Reaction-path Modelingmentioning

confidence: 93%

“…The high solubility of Al required for precipitating sufficiently large amounts of alumosilicate minerals from aqueous metamorphic fluids as a response to changes in temperature, pressure or chemical potential cannot be achieved through a speciation model that includes only Al hydroxide and alkali aluminate complexes Helgeson 1995, 1997;Diakonov et al 1996;Tagirov and Schott 2001;Verlaguet et al 2006;Tropper and Manning 2007). Such high solubilities require the involvement of additional factors such as (1) elevated concentrations of unusual ligands, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Formation of kyanite–quartz veins of the Alpe Sponda, Central Alps, Switzerland: implications for Al transport during regional metamorphism

Beitter

Wagner

Markl

2008

Contrib Mineral Petrol

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In this study, we have investigated the formation of quartz-kyanite veins of the Alpe Sponda, Central Alps, Switzerland. We have integrated field observations, fluid inclusion and stable isotope data and combined this with numerical geochemical modeling to constrain the chemical processes of aluminum transport and deposition. The estimated P-T conditions of the quartz-kyanite veins, based on conventional geothermometry (garnet-biotite, white mica solvus and quartz-kyanite oxygen isotope thermometry) and fluid inclusion data, are 550 ± 30°C at 5.0 ± 0.5 kbar. Geochemical modeling involved construction of aqueous species predominance diagrams, calculation of kyanite and quartz solubility, and reactionpath simulations. The results of the modeling demonstrate that (1) for the given chemical composition of the veinforming fluids mixed Al-Si aqueous species are dominant in transporting Al, and that (2) fluid cooling along a small temperature gradient coupled with a pH decrease is able to explain the precipitation of the quartz-kyanite assemblages in the proportions that are observed in the Alpe Sponda veins. We conclude that sufficient amounts of Al can be transported in typical medium-to high-grade regional metamorphic fluids and that immobile behavior of Al is not very likely in advection-dominanted fluid-rock systems in the upper and middle crust.

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Section: Mineral Solubility and Reaction-path Modelingmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Formation of kyanite–quartz veins of the Alpe Sponda, Central Alps, Switzerland: implications for Al transport during regional metamorphism

Beitter

Wagner

Markl

2008

Contrib Mineral Petrol

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“…The Al concentrations in the fluid inclusions do not correlate with the salinity, but they show a broadly positive correlation with temperature. Measured Al concentrations of 45-89 ppm exceed the predictions from experimental solubility studies and fluid-mineral equilibria modeling (Ragnarsdottir & Walther 1985;Manning 1998Manning , 2006Manning , 2007Tagirov & Schott 2001;Verlaguet et al 2006;Dolejs & Wagner 2008) by an order of magnitude (Fig. 15).…”

Section: Tiefengletschermentioning

confidence: 81%

“…Measured Al concentrations of 45–89 ppm exceed the predictions from experimental solubility studies and fluid–mineral equilibria modeling (Ragnarsdottir & Walther ; Manning , , ; Tagirov & Schott ; Verlaguet et al . ; Dolejs & Wagner ) by an order of magnitude (Fig. ).…”

Section: Discussionmentioning

confidence: 94%

Chemical evolution of metamorphic fluids in the Central Alps, Switzerland: insight from LA‐ICPMS analysis of fluid inclusions

Rauchenstein-Martinek

Wagner

Wälle

et al. 2016

Geofluids

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The chemical evolution of fluids in Alpine fissure veins (open cavities with large free‐standing crystals) has been studied by combination of fluid inclusion petrography, microthermometry, LA‐ICPMS microanalysis, and thermodynamic modeling. The quartz vein systems cover a metamorphic cross section through the Central Alps (Switzerland), ranging from subgreenschist‐ to amphibolite‐facies conditions. Fluid compositions change from aqueous inclusions in subgreenschist‐ and greenschist‐facies rocks to aqueous–carbonic inclusions in amphibolite‐facies rocks. The fluid composition is constant for each vein, across several fluid inclusion generations that record the growth history of the quartz crystals. Chemical solute geothermometry, fluid inclusion isochores, and constraints from fluid–mineral equilibria modeling were used to reconstruct the pressure–temperature conditions of the Alpine fissure veins and to compare them with the metamorphic path of their host rocks. The data demonstrate that fluids in the Aar massif were trapped close to the metamorphic peak whereas the fluids in the Penninic nappes record early cooling, consistent with retrograde alteration. The good agreement between the fluid–mineral equilibria modeling and observed fluid compositions and host‐rock mineralogy suggests that the fluid inclusions were entrapped under rock‐buffered conditions. The molar Cl/Br ratios of the fluid inclusions are below the seawater value and would require unrealistically high degrees of evaporation and subsequent dilution if they were derived from seawater. The halogen data may thus be better explained by interaction between metamorphic fluids and organic matter or graphite in metasedimentary rocks. The volatile content (CO2, sulfur) in the fluid inclusions increases systematically as function of the metamorphic grade, suggesting that the fluids have been produced by prograde devolatilization reactions. Only the fluids in the highest grade rocks were partly modified by retrograde fluid–rock interactions, and all major element compositions reflect equilibration with the local host rocks during the earliest stages of postmetamorphic uplift.

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“…Aluminium is preferably linked with high temperature such as in a magmatic system and considered to be immobile at submagmatic temperatures, and its incorporation in magnetite is largely temperature controlled (Verlaguet, Brunet, Goffé, & Murphy, 2006). The enrichment of Al in high-grade iron ore suggests a relatively high temperature alteration.…”

Section: Biotitementioning

confidence: 99%

In situ LA‐ICP‐MS trace element analysis of magnetite from the late Neoarchean Gongchangling BIFs, NE China: Constraints on the genesis of high‐grade iron ore

et al. 2017

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The Precambrian banded iron formations (BIFs) not only relate to the evolution of life, ocean, and atmosphere but also provide important reserves of iron around the world. The Gongchangling iron ore deposit located in the Anshan‐Benxi area of Liaoning Province, China, is oxide facies Algoma‐type BIFs, and the Gongchangling No.2 mining area is famous for the production of high‐grade iron ore in China. Magnetite is the main ore mineral in the Gongchangling iron ore deposit, and the magnetite mainly exhibits three modes of occurrence: BIFs (without actinolite), actinolite‐bearing BIFs, and high‐grade iron ore. Trace elemental compositions of the magnetite with different occurrences of the Gongchangling iron ore deposit were obtained by laser ablation inductively coupled plasma mass spectrometry to constrain the genesis of the high‐grade iron ore. The magnetite from actinolite‐bearing BIFs shows relatively lower contents of Mg, Al, Mn, and Zn compared to the magnetite from BIFs (without actinolite), suggesting that coexisting minerals have played an important role in the trace element concentration in magnetite. The magnetite from high‐grade iron ore has lower contents of Ti and V and higher contents of Al and Mn than counterpart from BIFs (with/without actinolite), indicating that the high‐grade iron ore may be reformed by high temperature metamorphic hydrothermal fluid. The staurolite‐garnet‐biotite schist is the wall‐rock of high‐grade iron ore, and the garnet‐biotite geothermometry is used to evaluate the metamorphic temperature of 593 ± 17 °C. It is proposed that the metamorphic hydrothermal fluid produced during regional metamorphism reformed BIFs to generate high‐grade iron ore.

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Experimental study and modeling of fluid reaction paths in the quartz–kyanite±muscovite–water system at 0.7GPa in the 350–550°C range: Implications for Al selective transfer during metamorphism

Cited by 30 publications

References 52 publications

Formation of kyanite–quartz veins of the Alpe Sponda, Central Alps, Switzerland: implications for Al transport during regional metamorphism

Formation of kyanite–quartz veins of the Alpe Sponda, Central Alps, Switzerland: implications for Al transport during regional metamorphism

Chemical evolution of metamorphic fluids in the Central Alps, Switzerland: insight from LA‐ICPMS analysis of fluid inclusions

In situ LA‐ICP‐MS trace element analysis of magnetite from the late Neoarchean Gongchangling BIFs, NE China: Constraints on the genesis of high‐grade iron ore

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