Advances in C-O-H-N-S fluid geochemistry based on micro-Raman spectrometric analysis of fluid inclusions

Dubessy, Jean; Poty, B.; Ramboz, Claire

doi:10.1127/ejm/1/4/0517

Cited by 304 publications

(132 citation statements)

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“…Nitrogen was not found in any of the studied inclusions. Quantitative relative proportions of carbonic species were calculated from equations proposed by Dubessy et al (1989).…”

Section: Materials and Analytical Methodsmentioning

confidence: 99%

The graphite deposit at Borrowdale (UK): A catastrophic mineralizing event associated with Ordovician magmatism

Menor

Millward

Luque

et al. 2010

Geochimica et Cosmochimica Acta

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The volcanic-hosted graphite deposit at Borrowdale in Cumbria, UK, was formed through precipitation from C-O-H flu ids. The 0 13 C data indicate that carbon was incorporated into the mineralizing fluids by assimilation of carbonaceous met a pelites of the Skiddaw Group by andesite magmas of the Borrowdale Volcanic Group. The graphite mineralization occurred as the fluids migrated upwards through normal conjugate fractures forming the main subvertical pipe-like bodies. The min eralizing fluids evolved from COrCH4-H20 mixtures (XC02 = 0.6-0.8) to CHCH20 mixtures. Coevally with graphite depo sition, the andesite and dioritic wall rocks adjacent to the veins were intensely hydrothermally altered to a propylitic assemblage. The initial graphite precipitation was probably triggered by the earliest hydration reactions in the volcanic host rocks. During the main mineralization stage, graphite precipitated along the pipe-like bodies due to CO2 --> C + O2. This agrees with the isotopic data which indicate that the first graphite morphologies crystallizing from the fluid (cryptocrystalline aggregates) are isotopically lighter than those crystallizing later (flakes). Late chlorite-graphite veins were formed from CH4-enriched fluids following the reaction CH4 + O2 --> C + 2H20, producing the successive precipitation of isotopically lighter graphite morphologies. Thus, as mineralization proceeded, water-generating reactions were involved in graphite precipitation, further favouring the propylitic alteration. The structural features of the pipe-like mineralized bodies as well as the isotopic homogeneity of graphite suggest that the mineralization occurred in a very short period of time.

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“…Nitrogen was not found in any of the studied inclusions. Quantitative relative proportions of carbonic species were calculated from equations proposed by Dubessy et al (1989).…”

Section: Materials and Analytical Methodsmentioning

confidence: 99%

The graphite deposit at Borrowdale (UK): A catastrophic mineralizing event associated with Ordovician magmatism

Menor

Millward

Luque

et al. 2010

Geochimica et Cosmochimica Acta

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“…Laser Raman spectroscopy has been extensively used for structural studies of hydrous natural and synthetic silicate glasses (e.g., Mysen et al, 1980, McMillan and Remmele, 1986, Mysen and Virgo, 1986b, Mysen, 1990, Zotov and Keppler, 1998and Zotov, 2003 and for chemical and physical characterization of fluid inclusions (e.g., Dubessy et al, 1989, Chou et al, 1990, Wopenka et al, 1990, Pasteris et al, 1996and Chen et al, 2004. Recently, new Raman analytical routines have been proposed for the quantitative analysis of total water content (H 2 O T ) and speciation (H 2 O m molecular/hydroxyl OH) in natural and synthetic aluminosilicate glasses (Thomas, 2000, Thomas, 2002, Chabiron et al, 2004and Arias et al, 2006.…”

Section: Introductionmentioning

confidence: 99%

Quantification of water content and speciation in natural silicic glasses (phonolite, dacite, rhyolite) by confocal microRaman spectrometry

Muro

Villemant

Montagnac

et al. 2006

Geochimica et Cosmochimica Acta

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The determination of total water content (H 2 O T : 0.1-10 wt%) and water speciation (H 2 O molecular /OH) in volcanic products by confocal microRaman spectrometry are discussed for alkaline (phonolite) and calcalkaline (dacite and rhyolite) silicic glasses. Shape and spectral distribution of the total water band (H 2 O T ) at 3550 cm −1 show systematic evolution with glass H 2 O T , water speciation and NBO/T. In the studied set of silicic samples, calibrations based on internal normalization of the H 2 O T band to a band related to vibration of aluminosilicate network (TOT) at 490 cm −1 vary with glass peraluminosity. An external calibration procedure using well-characterized glass standards is less composition-dependent and provides excellent linear correlation between total dissolved water content and height or area of the H 2 O T Raman band. Accuracy of deconvolution procedure of the H 2 O T band to quantify water speciation in water-rich and depolymerized glasses depends on the strength of OH hydrogen bonding. System confocal performance, scattering from embedding medium and glass microcrystallinity have a crucial influence on accuracy of Raman analyses of water content in glass-bearing rocks and melt inclusions in crystals.

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“…These results are consistent with the well-documented fact that the Raman scattering cross-sections for CO 2 , N 2 , and O 2 are very similar, whereas the scattering crosssection for CH 4 is almost an order of magnitude greater. 24,37,38 The detection limit for CH 4 is therefore about 10ϫ better than that for CO 2 , N 2 , and O 2 .…”

Section: Fig 6 Comparison Of the Raman Spectra Of Deionized Water (mentioning

confidence: 99%

Feasibility of Large-Scale Ocean Co2 Sequestration

Brewer¹,

Barry²

2004

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ABSTRACT:The past year has been one of continued high productivity and technical innovation for research conducted under support of this contract. We report here on the successful completion of development of a deep-ocean laser Raman spectrometer, and the use of this novel system for direct in situ measurement of the dissolution rate of CO 2 from a N 2 /CO 2 gas mixture at 300m ocean depth. We have carried out the deepest ever ocean CO 2 injection experiment at 3960m depth, and have observed the behavior of the plume of low pH/high CO 2 water emanating from this source. This was made possible by the design, construction, and operation of a novel flume to contain the liquid CO 2 and to force flow in a controlled manner over the liquid CO 2 surface. In carrying out this experiment we observed for the first time the extraordinarily rapid hydration kinetics of CO 2 with water at high pressure. This initial observation was later confirmed in a carefully controlled series of acid and CO 2 injection studies at varying depths. In carrying out this research we are aware of the environmental concerns, and we have been in the forefront of identifying the challenges resulting from the far greater quantities of CO 2 being passively absorbed from the atmosphere. This quantity now is approximately 1 million metric tons CO 2 per hour, and reasonable projections for the 21 st century project ocean pH changes of 0.3 or more by mid-century. The PIs have played a key role in organizing a major international meeting on this topic, and on reporting the results. We are now engaged in developing the novel techniques required to investigate this problem. INTRODUCTIONThe primary mechanism preventing very fast accumulation of CO 2 in the atmosphere is ocean absorption through the sea surface. This absorption, driven by the accumulated mean pCO 2 difference between air and sea, now proceeds at a rate of about 1 million metric tons CO 2 per hour. Thus ocean passive "disposal" of fossil fuel CO 2 is the primary greenhouse gas control technique used by all nations at all times, and the accumulated oceanic fossil fuel burden is now ≅ 500 billion tons CO 2 . In the few years that CO 2 is resident in the atmosphere it affects the planetary radiation balance and contributes to global warming. Thus some 25 years ago it was first suggested that direct injection of CO 2 into the deep ocean, thus bypassing the atmospheric disposal step with its attendant global warming, would be a useful greenhouse gas control technology. We have investigated this process in a series of studies carried out in part through the support of this award. These have involved creation of advanced experimental techniques for injection of CO 2 into the deep ocean, the measurement of the fate and behavior of the injected liquid, the formation and dissolution of a solid hydrate, and the environmental consequences of both direct and indirect CO 2 injection into the ocean. EXECUTIVE SUMMARYIn this report we detail research carried out in the period October 1, 2003 through Septemb...

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Advances in C-O-H-N-S fluid geochemistry based on micro-Raman spectrometric analysis of fluid inclusions

Cited by 304 publications

References 0 publications

The graphite deposit at Borrowdale (UK): A catastrophic mineralizing event associated with Ordovician magmatism

The graphite deposit at Borrowdale (UK): A catastrophic mineralizing event associated with Ordovician magmatism

Quantification of water content and speciation in natural silicic glasses (phonolite, dacite, rhyolite) by confocal microRaman spectrometry

Feasibility of Large-Scale Ocean Co2 Sequestration

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