Structural Petrology of Planes of Liquid Inclusions

Tuttle, O. F.

doi:10.1086/625629

Cited by 97 publications

(39 citation statements)

References 7 publications

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“…(Hicks, 1884;Van Hise, 1890) appear as rectilinear succession of secondary fluid inclusions (Roedder, 1962(Roedder, , 1984. Tuttle (1949), Wise (1964), and more recently Lespinasse and P6cher (1986), Kowallis et al (1987), Laubach (1989), andRen et al (1989) have emphasised the use of FIT for relating the different stages of fluid percolation to a regional succession of deformational events. By studying microthermometric properties of the fluids trapped in the trails, P6cher et al (1985) have correlated the nature of the percolating fluid to specific directions of microfissuring and stress orientation.…”

Section: Methodsmentioning

confidence: 99%

Fluid migration during contact metamorphism: the use of oriented fluid inclusion trails for a time/space reconstruction

Cathelineau¹,

Lespinasse²,

Bastoul³

et al. 1990

Mineral. mag.

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Microthermometric characteristics of metamorphic to hydrothermal fluids and microfracturing were studied in a contact zone between metamorphic series and peraluminous granites, located in the southern part of the Mont Loz6re pluton (Massif Central, France). Four major stages of fluid production or migration have been recognized: (1) Nz-CH 4 (+CO2)-rich fluids related to the metamorphism of the C-bearing shales, occurring as fluid inclusion along the quartz grain boundaries; (2) CO2-CH4-H20 vapours or liquids, with homogenization temperatures of 400 _+ 20 and 350 + 50~ respectively, related to the first hydrothermal stage produced by the late peraluminuous intrusions; (3) aqueous fluids having low salinities and Th in the range 150-330 ~ (4) low-temperature aqueous fluids.It is shown that the percolation of hydrothermal fluids occurs through a dense set of microfissures on a microscopic scale. The different stages of fluid percolation have been investigated by relating the deformational events to the observed fracturing. The nature of the hydrothermal fluid has been deduced by studying the trails of fluid inclusions. Analysis of the relationships of the fluid inclusion trails (F.I.T.) with structures associated with plastic deformation show that their propagation is independent of the intracrystalline anisotropies. Combined studies of their orientation in space and their microthermometric characteristics show that: (1) according to the direction, several generations of fluids are distinguished within each sample on the basis of their physical-chemical characteristics; they correspond to different stages of the hydrothermal activity and to different directions of microcrack opening; (2) in bulk isotropic media (granite), fluid inclusion trails are essentially mode I cracks which can be used as excellent markers of paleostress fields; however, in bulk anisotropic media (quartz lenses in mica schists) the migration directions of the fluids are mostly dependent on the local reorientations of the stress fields.The study of the contact zone between granites and a metamorphic series submitted to local abnormal heat flows shows that fluid characteristics are significantly different in the two environments. Migration of carbonic fluids from mica schists towards granites occurred but is relatively limited, whilst aqueous fluids mixed in variable amounts with carbonic fluids in the metamorphic zone.

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Section: Methodsmentioning

confidence: 99%

Fluid migration during contact metamorphism: the use of oriented fluid inclusion trails for a time/space reconstruction

Cathelineau¹,

Lespinasse²,

Bastoul³

et al. 1990

Mineral. mag.

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“…Post-magmatic recrystallization and superimposition of many generations of secondary inclusions appears to be the rule rather than the exception (Tuttle, 1949;Alderton, 1983 andP6cher et al, 1985). Recent studies by London (1985) on the apparently coeval quartz and spodumene from the Tanco pegmatite have further shown that, even if well-formed primary inclusions are present, the results from the two minerals may be incompatible due to preferential subsolidus recrystallization of quartz.…”

Section: Significance Of Thermometric Data From Secondary Fluid Inclumentioning

confidence: 97%

Evolution of fluid phases associated with lithium pegmatites from SE Ireland

Whitworth

Rankin

1989

Mineral. mag.

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Fluid inclusions in quartz from internally zoned barren and spodumene-bearing pegmatites associated with the Leinster granite of SE Ireland represent a variety of early and late hydrothermal fluids responsible for the development of pegmatites. Microthermometry and optical examination reveal two main populations of inclusions. The first (Type 1) comprises low-moderate salinity brines which homogenized at temperatures up to about 400 ~ The second (Type 2) appear to postdate the first population and are characteristically more saline and homogenized at temperatures mostly below 250 ~ Isochores for model type 1 inclusion fluids indicate that a late-magmatic/early-hydrothermal fluid developed from the Leinster granite at 675 ~ and 2.5 kbar and cooled isobarically into the spodumene stability field where complete crystallization of the pegmatites took place. Later, more saline, type 2 fluids of unknown origin may have contributed to the alteration of spodumene to muscovite and albite with the accompanying release of lithium from the lattice of spodumene. K E YW O R O S: fluid inclusions, pegmatite, lithium, Leinster, Ireland, isobaric cooling.

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“…Type V: Subgrain boundary and grain boundary fractures. Type VI: Fluid inclusion planes (always intragranular); these are shown as linear traces of bubbles, marking the location of healed (or sealed) fractures (e.g., TUTTLE, 1949).…”

Section: Microscale Damage Characteristicsmentioning

confidence: 99%

Characterization of Damage in Sandstones along the Mojave Section of the San Andreas Fault: Implications for the Shallow Extent of Damage Generation

Dor

Chester

Ben‐Zion

et al. 2009

Pure appl. geophys.

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Following theoretical calculations that suggest shallow generation of rock damage during an earthquake rupture, we measure the degree of fracture damage in young sedimentary rocks from the Juniper Hills Formation (JHF) that were displaced 21 km along the Mojave section of San Andreas Fault (SAF) and were not exhumed significantly during their displacement. In exposures adjacent to the fault, the JHF typically displays original sedimentary fabrics and little evidence of bulk shear strain at the mesoscopic scale. The formation is, however, pervasively fractured at the microscopic scale over a zone that is about a 100 m wide on the southwest side of the SAF near Little Rock. The abundance of open fractures, the poor consolidation, and the shallow inferred burial depth imply that the damage was generated close to the surface of the Earth. The spatial correlation of this damage with a seismically active trace of the SAF suggests that it was generated by SAF slip events that by assumption were of a seismic nature throughout the displacement history of the JHF. Thus the JHF provides a very shallow upper bound for the generation of brittle damage in a seismic fault zone. The fracture fabric is characterized by preferred orientations of fractures that split grains between contact points and is consistent with overall deformation under directed compression. However, the available results cannot be used to distinguish between proposed off-fault damage mechanisms. Fracture orientations are compatible with a maximum compressive stress oriented at a high angle to the fault at about 10 m, and at a lower, more variable angle farther away from the fault. The fracture distribution and fabric are consistent with observations made of the microscale damage characteristics of the Hungry Valley Formation in the northwestern section of the SAF in the Mojave, and with previous observations of exhumed, ancestral strands of the SAF.

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Structural Petrology of Planes of Liquid Inclusions

Cited by 97 publications

References 7 publications

Fluid migration during contact metamorphism: the use of oriented fluid inclusion trails for a time/space reconstruction

Fluid migration during contact metamorphism: the use of oriented fluid inclusion trails for a time/space reconstruction

Evolution of fluid phases associated with lithium pegmatites from SE Ireland

Characterization of Damage in Sandstones along the Mojave Section of the San Andreas Fault: Implications for the Shallow Extent of Damage Generation

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