Kinetically controlled oxygen isotope exchange between fluid and rock in one-dimensional advective flow

Lassey, Keith R.; Blattner, Peter

doi:10.1016/0016-7037(88)90197-4

Cited by 82 publications

(64 citation statements)

References 19 publications

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“…In comparison with known models proposed by Taylor (1977) and Criss et al (1987), the model takes into ac count spatial and dynamic characteristics of the processes. The approach is close to the models proposed by Cathles (1983) and Lassey and Blattner (1988), but our model describes the multimineral isotopic exchange. The model im plies that interaction is carried out by (1) surface reaction or (2) diffusion mechanisms of exchange (Cole and Ohmoto, 1986).…”

Section: Discussionsupporting

confidence: 75%

Isotopic and geochemical study of the conditions of tin ore formation of Solnechnoye deposit(Far East of Russia).

et al. 1994

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Physical chemical characteristics of the Solnechnoye tin deposit hydrothermal system have been stud ied. Ores of cassiterite-tourmaline type was formed in a vertically dipping fracture zone, extended up to 8 km in a metamorphosed mass of sandstone-shale rocks. This rock mass transfers in its root part to a granitoid massif (quartz diorites-monzonites).The evolution in composition of the mineral-forming solution was studied by gas-chromatographic analysis of gaseous phase of fluid inclusions. The analysis of aqueous extracts from fluid inclusions (AAS, potentiometry, ICP and ionic chromatography) was also performed. It was found that as the process proceeded from the preore quartz-tourmaline stage to productive quartz-cassiterite, the values of axco-' a(s11), C02/CH4, HCO3/Cl and pH increased. The value of foe corresponded to the F-Q-M buffer on thie preore stage and increased up to that of the Ni-NiO buffer during the formation of the main part of cassiterite ores.Study of organic compounds showed that a greater degree of oxidation in comparison to the preore stage is typical for the quartz-cassiterite and the main sulfide stages. It means that organic compounds participated in redox reactions which took place in the solutions during the precipitation of these mineral assemblages.The 8180 values of fluids calculated from the 8180 values obtained for the minerals show a distinct trend of decrease toward later stages. The 8D values for the waters from the inclusions are close to those found for contemporary meteoric waters (-120%o). A transport model of non-isothermal isotope exchange between water and arbitrary number of minerals along the fluid flow paths was used for the interpretation of these isotope data as well as of the data on the isotope composition of the wall-rocks. Descending flow of meteoric waters was found to interact with sandstone-shale rocks and with granitoids before entering into the discharge zone. Thus while studying reasons of ore formation in a given hydrothermal system it is necessary to answer subsequently several questions: a) what are the main changes in the physical chemical prop erties of fluid in the process of the ore formation; b) which of the factors plays the decisive role in the deposition of ore material; c) with which re actions these changes are coupled; and d) which properties of the hydrothermal system are respon sible for the changes of physical chemical condi tions in the solutions. Large economic tin deposit Solnechnoye was chosen for the main object of our study. This de posit is a typical representative of tourmaline type of cassiterite-silicate formation according to the classification (Lugov et al., 1976). Some ques tions of geological structure, chemical and miner alogical compositions of this deposit have been discussed by several authors (Gonevchuk et al., 1984). Many papers (Bannikova et al., 1984(Bannikova et al., , 1989Kokorina, 1982;Sushchevskaya et al., 1978Sushchevskaya et al., , 1984 are dedicated to the problems of physical chemi cal conditions of its for...

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Section: Discussionsupporting

confidence: 75%

Isotopic and geochemical study of the conditions of tin ore formation of Solnechnoye deposit(Far East of Russia).

et al. 1994

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“…The Cal EB 1 calcites display a range of stable-isotope compositions too wide to be interpreted as inherited from and determined by a homogenous source with which the fluid reached equilibrium. Oxygen and carbon isotope data of Cox (2007) indicate that externally derived fluids introduced into a developing fracture system may lead to variable isotopic compositions of fluids because of variable buffering by host rock, as also described by Lassey & Blattner (1988). This process can lead to significantly different isotopic compositions within spatially and temporally related veins.…”

Section: Discussionmentioning

confidence: 95%

“…The wide range of measured isotopic compositions indicates that the reactive path lengths were too short for the fluids to attain isotopic equilibrium with the host rock (Barker et al 2009). Isotope data from transecting veins may be more representative of the unbuffered parent fluid because, according to the model of Lassey & Blattner (1988), the fluid-rock system becomes more fluid-buffered during its evolution, so the late veins of a vein generation are less rock-buffered. The d 18 O and d…”

Section: Discussionmentioning

confidence: 99%

The relevance of vein texture in understanding the past hydraulic behaviour of a crystalline rock mass: reconstruction of the palaeohydrology of the Mecsekalja Zone, south Hungary

Dabi¹,

Siklósy²,

Schubert³

et al. 2011

Geofluids

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This study reconstructs the palaeohydrogeologic evolution of the shallow-to-moderate Mesozoic subsidence history for the Mecsekalja Zone (MZ), a narrow metamorphic belt in the eastern Mecsek Mountains, Hungary. Brittle deformation of the MZ produced a vein system with a cement history consisting of five sequential carbonate generations and one quartz phase. Vein textures suggest different fluid-flow mechanisms for the parent fluids of subsequent cement generations. Combined microthermometric and stable-isotope measurements permit reconstruction of the character of subsequent fluid generations with different flow types, as defined by vein textures, yielding new information regarding the hydraulic behaviour of a metamorphic crystalline complex. Textural observations and geochemical data suggest that fracture-controlled flow pathways and externally derived fluids were typical of some flow events, while percolation through the rock matrix and the relationship to the Cretaceous volcanism and dyke emplacement were typical of others. The difference in the mode of calcite deposition from pervasive fluids (i.e. pervasive carbonatisation along grain boundaries versus deposition in antitaxial veins) between two calcite generations related to the volcanism inspired a stress-dependent model of antitaxial vein growth. Textural and isotope variations in a vein generation produced by the same parent fluid indicate rock-dependent hydraulic behaviour for different rock types, distinct action of the contemporaneous fracture systems and different extents of fluid-rock interaction. Cathodoluminescence microscopy and fluid-inclusion microthermometry shed light on the possible role of hydraulic fracturing in the formation of massive calcite. The time of formation was estimated from the isotope composition of the oldest calcite generation and its presumptive relationship with the sedimentary sequences to the north, whereas microthermometry permitted conciliation of the reconstructed flow sequence with the Mesozoic subsidence history of the Mó rá gy Block (including the MZ).

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“…In some instances, the zone of depletion is a distinct trough bounded on the downstream side by a sharp geochemical front, but in many natural occurrences the geochemical front is broadened and rounded by a variety of physical and chemical processes that are collectively referred to as hydrodynamic dispersion (Figure 12). Dispersion in crustal environments has been attributed to sluggish reaction kinetics between rock and fluid (kinetic dispersion [e.g., Lassey and Blattner, 1988;Bickle, 1992]), heterogeneous fluid flow (kinematic dispersion [e.g., Bowman et al, 1994]) or to simultaneous chemical reactions with coupling between chemical systems (reaction dispersion [Dipple, 1998]). Dispersive effects of diffusion are typically limited to length scales of a few meters or less [Bickle and McKenzie, 1987].…”

Section: Model-derived Constraints For Time-integrated Fluid Flux Andmentioning

confidence: 99%

“…[55] We adopt the reactive transport model of Lassey and Blattner [1988], which attributes dispersion to sluggish reaction kinetics because (1) oxygen isotope exchange kinetics between fluid and carbonate and silicate minerals is relatively sluggish at the modest temperatures attained in the Western Ranges [Cole and Ohmoto, 1986] and (2) simultaneous sampling of wall rock and vein provides information on the variation of rock and fluid composition along the transect. The systematic differences in rock and vein composition in the Western Ranges (Figures 6b and 7) is an important constraint for our reactive transport modeling because it demonstrates that fluid and rock were out of local isotopic equilibrium.…”

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confidence: 99%

New evidence for syntectonic fluid migration across the hinterland‐foreland transition of the Canadian Cordillera

2002

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[1] Oxygen isotope data from syntectonic veins, thrust faults, and wall rocks suggest that fluids infiltrated the Western Ranges of the Rocky Mountain foreland from deeper rocks of the Dogtooth Range during Mesozoic contraction. This signifies the first such evidence for kilometerscale fluid migration at the hinterland-foreland transition of the Canadian Cordillera. Fluid infiltration resulted in isotopic depletion in wall rocks and isotopic disequilibrium between veins (fluid) and their host rocks downstream of a lithologic, structural, and isotopic shift between predominantly siliciclastic (Dogtooth Range) and calcareous (Western Ranges) sequences. The shift corresponds with an average d 18 O that is 3.0% higher in the Western Ranges. In the Dogtooth Range, atypically low carbonate values (15.6% ± 0.8% (VSMOW)), and the consistency with which vein signatures approach the average bulk rock d18 O of individual outcrops indicate fluid buffering by a siliciclastic reservoir and outcrop-scale (10 -100 m) fluid circulation. In contrast, rocks and veins in the Western Ranges exhibit a gradational increase in d18 O that extends !14 km eastward and up section from the isotopic shift and possess values that are below or at the low end of typical carbonate compositions (16.2 -20.9% (VSMOW)). Furthermore, veins systematically exhibit lower oxygen values than their host rocks; this implies that the fluids that entered the Western Ranges were in modest disequilibrium with the rocks through which they flowed. We use a one-dimensional reactive transport model to infer that rocks in the Western Ranges experienced a time-integrated fluid flux of 1.1 Â 10 5 mol H 2 O cm À2 (%2.4 Â 10 6 cm 3 cm À2 ) and sluggish reaction kinetics during the flow event.

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Kinetically controlled oxygen isotope exchange between fluid and rock in one-dimensional advective flow

Cited by 82 publications

References 19 publications

Isotopic and geochemical study of the conditions of tin ore formation of Solnechnoye deposit(Far East of Russia).

Isotopic and geochemical study of the conditions of tin ore formation of Solnechnoye deposit(Far East of Russia).

The relevance of vein texture in understanding the past hydraulic behaviour of a crystalline rock mass: reconstruction of the palaeohydrology of the Mecsekalja Zone, south Hungary

New evidence for syntectonic fluid migration across the hinterland‐foreland transition of the Canadian Cordillera

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