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  • English  (2)
  • 2020-2022  (1)
  • 2000-2004  (1)
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  • English  (2)
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  • 1
    Online Resource
    Online Resource
    Water-Rock Interaction. (2002)
    Dordrecht :Springer Netherlands,
    Details
    Keywords: Hydrogeology. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (238 pages)
    Edition: 1st ed.
    ISBN: 9789401004381
    Series Statement: Water Science and Technology Library ; v.40
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=3103839
    Language: English
    Note: WATER-ROCK INTERACTION -- Editor's page -- Copyright -- Table of contents -- Preface -- Groundwater Evolution in an Arid Coastal Region of the Sultanate of Oman based on Geochemical and Isotopic Tracers -- A combined isotopic tool box for the investigation of water-rock interaction: An overview of Sr, B, O, H isotopes and U-series in deep groundwaters from the Vienne granitoid (France) -- Water-rock reaction experiments with Black Forest gneiss and granite -- The distribution of rare earth elements and yttrium in water-rock interactions: field observations and experiments. -- A CASE STUDY OF GAS-WATER-ROCK INTERACTION IN A VOLCANIC AQUIFER: THE SOUTH-WESTERN FLANK OF MT. ETNA (SICILY) -- MODELING CHEMICAL BRINE-ROCK INTERACTION IN GEOTHERMAL RESERVOIRS -- Water-Rock Reactions in a Barite-Fluorite Underground Mine, Black Forest (Germany) -- Extensional Veins and Pb-Zn Mineralisation in Basement Rocks: The Role of Penetration of Formation Brines -- Interaction of polysilicic and mono silicic acid with mineral surfaces.
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  • 2
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    Decoding the complex internal chemical structure of garnet porphyroblasts from the Zermatt area, Western Alps (2021)
    Details
    Publication Date: 2021-07-26
    Description: Garnet is a prototypical mineral in metamorphic rocks because it commonly preserves chemical and textural features that can be used for untangling its metamorphic development. Large garnet porphyroblasts may show extremely complex internal structures as a result of a polycyclic growth history, deformation, and modification of growth structures by intra- and intercrystalline diffusion. The complex internal structure of garnet porphyroblasts from garnet–phengite schists (GPS) of the Zermatt area (Western Alps) has been successfully decoded. The centimetre-sized garnet porphyroblasts are composed of granulite facies garnet fragments overgrown by a younger generation of grossular-rich eclogite facies garnet. The early granulite facies garnet (G-Grt) formed from low-P, high-T metamorphism during a pre-Alpine orogenic event. The late garnet (E-Grt) is typical of high-pressure, low-temperature (HPLT) metamorphism and can be related to Alpine subduction of the schists. Thus, the garnet of the GPS are polycyclic (polymetamorphic). G-Grt formation occurred at ~670 MPa and 780°C, E-Grt formed at ~1.7 GPa and 530°C. The G-Grt is relatively rich in Prp and poor in Grs, while E-Grt is rich in Grs and poor in Prp. The Alm content (mol.%) of G-Grt is 68 of E-Grt 55. After formation of E-Grt between and around fragmented G-Grt at 530°C, the GPS have been further subducted and reached a maximum temperature of 580°C before exhumation started. Garnet composition profiles indicate that the initially very sharp contacts between the granulite facies fragments of G-Grt and fracture seals of HPLT garnet (E-Grt) have been modified by cation diffusion. The profiles suggest that Ca did not exchange at the scale of 1 µm, whereas Fe and Mg did efficiently diffuse at the derived maximum temperature of 580°C for the GPS at the scale of 7–8 µm. The Grt–Grt diffusion profiles resulted from spending c. 10 Ma at 530–580°C along the P–T–t path. The measured Grt composition profiles are consistent with diffusivities of log DMgFe = −25.8 m2/s from modelled diffusion profiles. Mg loss by diffusion from G-Grt is compensated by Fe gain by diffusion from E-Grt to maintain charge balance. This leads to a distinctive Fe concentration profile typical of uphill diffusion.
    Keywords: 549 ; diffusion ; eclogite facies ; garnet ; porphyroblast ; uphill diffusion
    Language: English
    Type: article
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