Timescales and mechanisms of fluid infiltration in a marble; an ion microprobe study

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doi: 10.1007/s004100050430
Authors:Graham, Colin M.; Valley, John W.; Eiler, John M.; Wada, Hideki
Author Affiliations:Primary:
University of Edinburgh, Department of Geology and Geophysics, Edinburgh, United Kingdom
Other:
University of Wisconsin, United States
California Institute of Technology, United States
Shizuoka University, Japan
Volume Title:Contributions to Mineralogy and Petrology
Source:Contributions to Mineralogy and Petrology, 132(4), p.371-389. Publisher: Springer International, Heidelberg-New York, International. ISSN: 0010-7999
Publication Date:1998
Note:In English. 59 refs.; 3 tables, geol. sketch map
Summary:To constrain scales of O isotope equilibrium, timescales and mechanisms of metamorphic fluid infiltration, and fluid sources and pathways, a detailed O isotope map of calcite grain in a coarse-grained marble was constructed. The marble, from the high-T-low-P Hida metamorphic belt, underwent granulite-facies then amphibolite-facies metamorphic events, the latter associated with regional granite intrusion. CL imaging indicates two types of calcite: yellow- (YLC) and purple-luminescing (PLC). The YLC, which occupies grain boundaries, fractures, replacement patches, and most of the abundant deformation twin lamellae, post-dates the dominant PLC, and maps out fluid pathways, is enriched in Mn and Fe, depleted in 18O and Sr compared with PLC, and is more 18O-depleted than is indicated from conventional analyses. Results indicate infiltration of 18O-depleted (metamorphic or magmatic) fluid (initial δ 18O = 9-10.50/00) along grain boundaries, fractures and deformation twin lamellae, depleting calcite grains in Sr and enriching them in Mn and Fe. Areas of PLC unaffected by 'short-circuiting' fluid pathways, contain O diffusion profiles of ∼ 10 0/00/200 µm in grain boundary regions or adjacent to fractures or patches. Correcting for estimated grain boundary/fracture and profile orientation in 3-D, produces profiles which when modelled give consistent estimates of Dt of 0.8 × 10-8 m2, from which times of ∼ 103-104 y. are obtained for fluid transport along grain boundaries; implying much higher rock permeabilities during fluid flow than those calculated from time-integrated fluid fluxes or predicted from laboratory measurements. It is likely that preservation of 18O/16O profiles requires loss of grain boundary fluid during a period of dry cooling following fluid passage. δ 18O-trace-element correlations are also consistent with volume diffusion-controlled transport in the PLC. Fluid transport and element exchange occurred by two interrelated mechanisms over short timescales, and different lengthscales-long-distance flow along cracks, grain boundaries and twin lamellae, and ∼ 200 µm-scale volume diffusion of O. [J.F.]
Sections:Geochemistry
Subsections:Metamorphic rocks
Subjects:Amphibolites; Calcite; Carbonates; Cathodoluminescence; Coarse-grained materials; Facies; Fluid phase; Granulites; Imagery; Infiltration; Ion probe data; Isotope ratios; Isotopes; Marbles; Mass spectra; Mechanism; Metamorphic rocks; O-18/O-16; Oxygen; Permeability; Spectra; Stable isotopes; Time scales; Trace elements; Asia; Far East; Hida metamorphic belt; Honshu; Japan
Coordinates:N354500 N374500 E1380000 E1354500
Abstract Numbers:99M/1803
Record ID:1999057588
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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100 1 |a Graham, Colin M.  |e analytic author  |u University of Edinburgh, Department of Geology and Geophysics, Edinburgh 
245 1 0 |a Timescales and mechanisms of fluid infiltration in a marble; an ion microprobe study 
300 |a p. 371-389 
500 |a In English. 59 refs. 
500 |a Abstract number: 99M/1803 
500 |a Abstractor: J.F. 
500 |a Category Section: Geochemistry 
500 |a Category Subsection: Metamorphic rocks 
500 |a Affiliation: University of Edinburgh, Department of Geology and Geophysics; Edinburgh; GBR; United Kingdom 
500 |a Affiliation: University of Wisconsin; ; USA; United States 
500 |a Affiliation: California Institute of Technology; ; USA; United States 
500 |a Affiliation: Shizuoka University; ; JPN; Japan 
500 |a Key title: Contributions to Mineralogy and Petrology 
500 |a Source note: Contributions to Mineralogy and Petrology, 132(4), p.371-389. Publisher: Springer International, Heidelberg-New York, International. ISSN: 0010-7999 
500 |a Publication type: journal article 
504 |b 59 refs. 
510 3 |a GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom 
520 |a To constrain scales of O isotope equilibrium, timescales and mechanisms of metamorphic fluid infiltration, and fluid sources and pathways, a detailed O isotope map of calcite grain in a coarse-grained marble was constructed. The marble, from the high-T-low-P Hida metamorphic belt, underwent granulite-facies then amphibolite-facies metamorphic events, the latter associated with regional granite intrusion. CL imaging indicates two types of calcite: yellow- (YLC) and purple-luminescing (PLC). The YLC, which occupies grain boundaries, fractures, replacement patches, and most of the abundant deformation twin lamellae, post-dates the dominant PLC, and maps out fluid pathways, is enriched in Mn and Fe, depleted in >18`O and Sr compared with PLC, and is more >18`O-depleted than is indicated from conventional analyses. Results indicate infiltration of >18`O-depleted (metamorphic or magmatic) fluid (initial δ >18`O = 9-10.50/00) along grain boundaries, fractures and deformation twin lamellae, depleting calcite grains in Sr and enriching them in Mn and Fe. Areas of PLC unaffected by 'short-circuiting' fluid pathways, contain O diffusion profiles of ∼ 10 0/00/200 µm in grain boundary regions or adjacent to fractures or patches. Correcting for estimated grain boundary/fracture and profile orientation in 3-D, produces profiles which when modelled give consistent estimates of Dt of 0.8 × 10>-8` m>2`, from which times of ∼ 10>3`-10>4` y. are obtained for fluid transport along grain boundaries; implying much higher rock permeabilities during fluid flow than those calculated from time-integrated fluid fluxes or predicted from laboratory measurements. It is likely that preservation of >18`O/>16`O profiles requires loss of grain boundary fluid during a period of dry cooling following fluid passage. δ >18`O-trace-element correlations are also consistent with volume diffusion-controlled transport in the PLC. Fluid transport and element exchange occurred by two interrelated mechanisms over short timescales, and different lengthscales-long-distance flow along cracks, grain boundaries and twin lamellae, and ∼ 200 µm-scale volume diffusion of O. 
650 7 |a Amphibolites  |2 georeft 
650 7 |a Calcite  |2 georeft 
650 7 |a Carbonates  |2 georeft 
650 7 |a Cathodoluminescence  |2 georeft 
650 7 |a Coarse-grained materials  |2 georeft 
650 7 |a Facies  |2 georeft 
650 7 |a Fluid phase  |2 georeft 
650 7 |a Granulites  |2 georeft 
650 7 |a Imagery  |2 georeft 
650 7 |a Infiltration  |2 georeft 
650 7 |a Ion probe data  |2 georeft 
650 7 |a Isotope ratios  |2 georeft 
650 7 |a Isotopes  |2 georeft 
650 7 |a Marbles  |2 georeft 
650 7 |a Mass spectra  |2 georeft 
650 7 |a Mechanism  |2 georeft 
650 7 |a Metamorphic rocks  |2 georeft 
650 7 |a O-18/O-16  |2 georeft 
650 7 |a Oxygen  |2 georeft 
650 7 |a Permeability  |2 georeft 
650 7 |a Spectra  |2 georeft 
650 7 |a Stable isotopes  |2 georeft 
650 7 |a Time scales  |2 georeft 
650 7 |a Trace elements  |2 georeft 
651 7 |a Asia  |2 georeft 
651 7 |a Far East  |2 georeft 
651 7 |a Hida metamorphic belt  |2 georeft 
651 7 |a Honshu  |2 georeft 
651 7 |a Japan  |2 georeft 
700 1 |a Valley, John W.,  |e analytic author  |u University of Wisconsin 
700 1 |a Eiler, John M.,  |e analytic author  |u California Institute of Technology 
700 1 |a Wada, Hideki,  |e analytic author  |u Shizuoka University 
773 0 |t Contributions to Mineralogy and Petrology  |d Heidelberg-New York : Springer International, Sep. 1998  |x 0010-7999  |y CMPEAP  |n Contributions to Mineralogy and Petrology, 132(4), p.371-389. Publisher: Springer International, Heidelberg-New York, International. ISSN: 0010-7999 Publication type: journal article  |g Vol. 132, no. 4  |h 3 tables, geol. sketch map 
856 |u urn:doi: 10.1007/s004100050430