000311029 001__ 311029
000311029 005__ 20250730111103.0
000311029 0247_ $$2doi$$a10.1093/petrology/egw044
000311029 0247_ $$2ISSN$$a0022-3530
000311029 0247_ $$2ISSN$$a1460-2415
000311029 0247_ $$2WOS$$aWOS:000383734100006
000311029 0247_ $$2datacite_doi$$a10.3204/PUBDB-2016-04578
000311029 0247_ $$2openalex$$aopenalex:W2511727492
000311029 037__ $$aPUBDB-2016-04578
000311029 041__ $$aEnglish
000311029 082__ $$a550
000311029 1001_ $$0P:(DE-H253)PIP1008346$$aGasc, Julien$$b0
000311029 245__ $$aEffect of Water Activity on Reaction Kinetics and Intergranular Transport: Insights from the $\mathrm{Ca(OH)_{2}  + MgCO_{3} \to CaCO_{3}  + Mg(OH)_{2}}$ Reaction at 1·8 GPa
000311029 260__ $$aOxford$$bOxford Univ. Press$$c2016
000311029 3367_ $$2DRIVER$$aarticle
000311029 3367_ $$2DataCite$$aOutput Types/Journal article
000311029 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1519201302_13252
000311029 3367_ $$2BibTeX$$aARTICLE
000311029 3367_ $$2ORCID$$aJOURNAL_ARTICLE
000311029 3367_ $$00$$2EndNote$$aJournal Article
000311029 500__ $$a(c) The Author. Published by Oxford University Press
000311029 520__ $$aThe kinetics of the irreversible reaction Ca(OH) 2  + MgCO 3 → CaCO 3  + Mg(OH) 2 were investigated at high pressures and temperatures relevant to metamorphic petrology, using both in situ synchrotron X-ray diffraction and post-mortem analysis of reaction rim growth on recovered samples. Reaction kinetics are found to strongly depend on water content; comparable bulk-reaction kinetics are obtained under water-saturated (excess water, c. 10 wt %) and under intermediate (0·1–1 wt % water) conditions when temperature is increased by c. 300 K. In contrast, similar reaction kinetics were observed at ∼673 K and 823 K between intermediate and dry experiments, respectively, where dry refers to a set of experiments with water activity below 1·0 (no free water), as buffered by the CaO–Ca(OH) 2 assemblage. Given the activation energies at play, this gap—corresponding to the loss of no more than 1 wt % of water by the assemblage—leads to a difference of several orders of magnitude in reaction kinetics at a given temperature. Further analysis, at the microscopic scale, of the intermediate and dry condition samples, shows that intergranular transport of calcium controls the reaction progress. Grain boundary diffusivities could be retrieved from the classic treatment of reaction rim growth rate. In turn, once modeled, this rate was used to fit the bulk kinetic data derived from X-ray powder diffraction, offering an alternative means to derive calcium diffusivity data. Based on a comparison with effective grain boundary data for Ca and Mg from the literature, it is inferred that both dry and intermediate datasets are consistent with a water-saturated intergranular medium with different levels of connectivity. The very high diffusivity of Ca in the CaCO 3  + Mg(OH) 2 rims, in comparison with that of Mg in enstatite rims found by earlier workers, emphasizes the prominent role of the interactions between diffusing species and mineral surfaces in diffusion kinetics. Furthermore, we show that the addition of water is likely to change the relative diffusivity of Mg and Ca in carbonate aggregates. From a qualitative point of view, we confirm, in a carbonate-bearing system, that small water content variations within the 0–1 wt % range have tremendous effects on both intergranular transport mechanisms and kinetics. We also propose that the water content dependent diffusivity of major species (Mg, Ca) in low-porosity metamorphic rocks is strongly dependent on the interaction between diffusing species and mineral surfaces. This parameter, which will vary from one rock-type to another, needs also to considered when extrapolating ( P , T , t , x H 2 O) laboratory diffusion data to metamorphic processes.
000311029 536__ $$0G:(DE-HGF)POF3-899$$a899 - ohne Topic (POF3-899)$$cPOF3-899$$fPOF III$$x0
000311029 588__ $$aDataset connected to CrossRef
000311029 693__ $$0EXP:(DE-H253)D-F2.1-20150101$$1EXP:(DE-H253)DORISIII-20150101$$6EXP:(DE-H253)D-F2.1-20150101$$aDORIS III$$fDORIS Beamline F2.1$$x0
000311029 7001_ $$0P:(DE-H253)PIP1008342$$aBrunet, Fabrice$$b1$$eCorresponding author
000311029 7001_ $$0P:(DE-H253)PIP1009446$$aBrantut, Nicolas$$b2
000311029 7001_ $$aCorvisier, Jérôme$$b3
000311029 7001_ $$0P:(DE-H253)PIP1008345$$aFindling, Nathaniel$$b4
000311029 7001_ $$0P:(DE-H253)PIP1011314$$aVerlaguet, Anne$$b5
000311029 7001_ $$0P:(DE-H253)PIP1002121$$aLathe, Christian$$b6
000311029 773__ $$0PERI:(DE-600)1466724-1$$a10.1093/petrology/egw044$$gVol. 57, no. 7, p. 1389 - 1408$$n7$$p1389 - 1408$$tJournal of petrology$$v57$$x1460-2415$$y2016
000311029 8564_ $$uhttps://bib-pubdb1.desy.de/record/311029/files/pdf%20from%20editor%20%28restricted%20access%29.pdf$$yRestricted
000311029 8564_ $$uhttps://bib-pubdb1.desy.de/record/311029/files/pdf%20from%20editor%20%28restricted%20access%29.gif?subformat=icon$$xicon$$yRestricted
000311029 8564_ $$uhttps://bib-pubdb1.desy.de/record/311029/files/pdf%20from%20editor%20%28restricted%20access%29.jpg?subformat=icon-1440$$xicon-1440$$yRestricted
000311029 8564_ $$uhttps://bib-pubdb1.desy.de/record/311029/files/pdf%20from%20editor%20%28restricted%20access%29.jpg?subformat=icon-180$$xicon-180$$yRestricted
000311029 8564_ $$uhttps://bib-pubdb1.desy.de/record/311029/files/pdf%20from%20editor%20%28restricted%20access%29.jpg?subformat=icon-640$$xicon-640$$yRestricted
000311029 8564_ $$uhttps://bib-pubdb1.desy.de/record/311029/files/pdf%20from%20editor%20%28restricted%20access%29.pdf?subformat=pdfa$$xpdfa$$yRestricted
000311029 8564_ $$uhttps://bib-pubdb1.desy.de/record/311029/files/Gasc2016_JPET.pdf$$yPublished on 2016-08-09. Available in OpenAccess from 2017-08-09.$$zStatID:(DE-HGF)0510
000311029 8564_ $$uhttps://bib-pubdb1.desy.de/record/311029/files/Gasc2016_JPET.gif?subformat=icon$$xicon$$yPublished on 2016-08-09. Available in OpenAccess from 2017-08-09.$$zStatID:(DE-HGF)0510
000311029 8564_ $$uhttps://bib-pubdb1.desy.de/record/311029/files/Gasc2016_JPET.jpg?subformat=icon-1440$$xicon-1440$$yPublished on 2016-08-09. Available in OpenAccess from 2017-08-09.$$zStatID:(DE-HGF)0510
000311029 8564_ $$uhttps://bib-pubdb1.desy.de/record/311029/files/Gasc2016_JPET.jpg?subformat=icon-180$$xicon-180$$yPublished on 2016-08-09. Available in OpenAccess from 2017-08-09.$$zStatID:(DE-HGF)0510
000311029 8564_ $$uhttps://bib-pubdb1.desy.de/record/311029/files/Gasc2016_JPET.jpg?subformat=icon-640$$xicon-640$$yPublished on 2016-08-09. Available in OpenAccess from 2017-08-09.$$zStatID:(DE-HGF)0510
000311029 909CO $$ooai:bib-pubdb1.desy.de:311029$$pdnbdelivery$$pdriver$$pVDB$$popen_access$$popenaire
000311029 9101_ $$0I:(DE-HGF)0$$6P:(DE-H253)PIP1008346$$aExternes Institut$$b0$$kExtern
000311029 9101_ $$0I:(DE-HGF)0$$6P:(DE-H253)PIP1008342$$aExternes Institut$$b1$$kExtern
000311029 9101_ $$0I:(DE-HGF)0$$6P:(DE-H253)PIP1009446$$aExternes Institut$$b2$$kExtern
000311029 9101_ $$0I:(DE-HGF)0$$6P:(DE-H253)PIP1008345$$aExternes Institut$$b4$$kExtern
000311029 9101_ $$0I:(DE-HGF)0$$6P:(DE-H253)PIP1011314$$aExternes Institut$$b5$$kExtern
000311029 9101_ $$0I:(DE-HGF)0$$6P:(DE-H253)PIP1002121$$aExternes Institut$$b6$$kExtern
000311029 9131_ $$0G:(DE-HGF)POF3-899$$1G:(DE-HGF)POF3-890$$2G:(DE-HGF)POF3-800$$3G:(DE-HGF)POF3$$4G:(DE-HGF)POF$$aDE-HGF$$bProgrammungebundene Forschung$$lohne Programm$$vohne Topic$$x0
000311029 9141_ $$y2016
000311029 915__ $$0StatID:(DE-HGF)0200$$2StatID$$aDBCoverage$$bSCOPUS
000311029 915__ $$0StatID:(DE-HGF)0600$$2StatID$$aDBCoverage$$bEbsco Academic Search
000311029 915__ $$0StatID:(DE-HGF)0530$$2StatID$$aEmbargoed OpenAccess
000311029 915__ $$0StatID:(DE-HGF)0100$$2StatID$$aJCR$$bJ PETROL : 2015
000311029 915__ $$0StatID:(DE-HGF)0150$$2StatID$$aDBCoverage$$bWeb of Science Core Collection
000311029 915__ $$0StatID:(DE-HGF)0110$$2StatID$$aWoS$$bScience Citation Index
000311029 915__ $$0StatID:(DE-HGF)0111$$2StatID$$aWoS$$bScience Citation Index Expanded
000311029 915__ $$0StatID:(DE-HGF)9900$$2StatID$$aIF < 5
000311029 915__ $$0StatID:(DE-HGF)0400$$2StatID$$aAllianz-Lizenz / DFG
000311029 915__ $$0StatID:(DE-HGF)0030$$2StatID$$aPeer Review$$bASC
000311029 915__ $$0StatID:(DE-HGF)1150$$2StatID$$aDBCoverage$$bCurrent Contents - Physical, Chemical and Earth Sciences
000311029 915__ $$0StatID:(DE-HGF)0420$$2StatID$$aNationallizenz
000311029 915__ $$0StatID:(DE-HGF)0199$$2StatID$$aDBCoverage$$bThomson Reuters Master Journal List
000311029 9201_ $$0I:(DE-H253)HAS-User-20120731$$kDOOR$$lDOOR-User$$x0
000311029 980__ $$ajournal
000311029 980__ $$aVDB
000311029 980__ $$aI:(DE-H253)HAS-User-20120731
000311029 980__ $$aUNRESTRICTED
000311029 9801_ $$aFullTexts