BORON ISOTOPE GEOCHEMISTRY DURING DIAGENESIS. PART I. EXPERIMENTAL DETERMINATION OF FRACTIONATION DURING ILLITIZATION OF SMECTITE
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dc.contributor.author | Williams L.B. | |
dc.contributor.author | Hervig R.L. | |
dc.contributor.author | Holloway J.R. | |
dc.contributor.author | Hutcheon I. | |
dc.date.accessioned | 2021-02-13T02:37:49Z | |
dc.date.available | 2021-02-13T02:37:49Z | |
dc.date.issued | 2001 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=610027 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2001, 65, 11, 1769-1782 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/24842 | |
dc.description.abstract | Experiments were performed to measure the isotopic fractionation of boron between illite/smectite (I/S) clay minerals and water as a function of temperature (300° and 350°C) and degree of illitization. Corresponding changes in the oxygen isotopes were monitored as an indication of the approach to equilibrium. The kinetics of the B-isotope exchange follows the mineralogical restructuring of smectite as it recrystallizes to illite. An initial decline in δ11BI/S occurs when the I/S is randomly ordered (RO). The δ11BI/S values reach a plateau during R1 ordering of the I/S, representing a metastable condition. The greatest change in δ11BI/S is observed during long-range (R3) ordering of the I/S when neoformation occurs.Values of δ11BI/S measured on the equilibrium reaction products were used to construct a B-isotope fractionation curve. There is a linear correlation among data from these experiments and 1100°C basaltic melt-fluid fractionation experiments (Hervig and Moore, 2000) that can be extrapolated to include adsorption experiments at 25°C (Palmer et al., 1987). Unlike other stable isotopic systems (e.g., oxygen) there is no mineral-specific fractionation of B-isotopes, but rather a coordination dependence of the fractionation. Under diagenetic conditions B is predominantly in trigonal coordination in fluids but substitutes in tetrahedral sites of silicates. The preference of 10B for tetrahedral bonds is the major fractionating factor of B in silicates. | |
dc.title | BORON ISOTOPE GEOCHEMISTRY DURING DIAGENESIS. PART I. EXPERIMENTAL DETERMINATION OF FRACTIONATION DURING ILLITIZATION OF SMECTITE | |
dc.type | Статья |
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