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  • Mineralogy, chemistry, and genesis of zeolitization in

    Feb 01, 2020· 5.1. Distribution and occurrence of alteration minerals. Zeolitization commonly occurs as a result of the devitrification of the volcanic glass found within glassy pyroclastic deposits, especially under the presence of volatiles and fluids (e.g., Fisher and Schminke, 1984; Cas and Wright, 1988).

  • Glass and Rock Dissolution and Zeolitization

    Glass and Rock Dissolution and Zeolitization. Carol M. Jantzen, Ph.D. Cory L. Trivelpiece, Ph.D. Resumption of alteration (Stage III) Sudden increase in release rate of Marked by the large-scale precipitation of secondary mineral phases (zeolites)

  • The role of argillic alteration in the zeolitization of

    The pseudomorphic replacement of glass shards by zeolite minerals is a common feature of volcanoclastic sediments. In the majority of cases the initial stage of this reaction is t

  • (PDF) The role of argillic alteration in the zeolitization

    There is no evidence for the clinoptilolite precipitation being preceded by the initial alteration of the glass to a clay mineral, as proposed for the zeolitization of volcanic glass in other

  • Hydrothermal alteration and zeolitization of the Fohberg

    Jun 26, 2014· The subvolcanic Fohberg phonolite (Kaiserstuhl Volcanic Complex, Germany) is an economic zeolite deposit, formed by hydrothermal alteration of primary magmatic minerals. It is mined due to the high (>40 wt%) zeolite content, which accounts for the remarkable zeolitic physicochemical properties of the ground rock. New mineralogical and geochemical studies are carried out (a) to

  • Wide spread zeolitization of the Neogene Quaternary

    Jan 01, 2015· The zeolitization process is attributed to the transformation of basaltic glass (sideromelane) into palagonite by reaction with percolating meteoric water indicating as an open hydrological system (Hay et al., 1968a, Hay et al., 1968b). This process was adopted to explain the zeolitization process in the Aritayn Formation by Ibrahim (1996). The

  • Geoautoclave-type zeolitization in the miocene tuffs

    Jan 01, 1995· The alteration process of the volcanic glass was similar to the general and well known steps of dis- solution of the glass, and increasing alkalinity of the system, which finally created optimal conditions for zeolite precipitation. The associating minerals are smectite and K-rich gel-like glass.

  • Influence of crystalline seeds on the zeolitization of

    Jan 01, 1994· The reaction enthalpy, mineral composition and the duration of the zeolitization process for the samples under study are shown in Tabl.1. In the experiments performed with pure pumice and in those with clino tilolite and phillipsite seeds phillipsite crystals were synthesised, whi e chabazite crystallized in the case of chabazite seeds.

  • Alteration processes and products of acid pyroclastic

    Alteration processes and products of acid mineral and chemical compositions of pyroclastic deposits in Bulgaria and Slovakia. during the process of zeolitization. Significant K

  • (PDF) Hydrothermal alteration and zeolitization of the

    Hydrothermal alteration and zeolitization of the Fohberg phonolite, Kaiserstuhl Volcanic Complex, Germany November 2014 International Journal of Earth Sciences 103(8):2273-2300

  • Zeolitization Article about Zeolitization by The Free

    Zeolitization is one of the forms of the metamorphism of rocks under conditions of zeolite facies. Basic effusive rocks are most frequently zeolitized, either fully or partially. Crystals of zeolites and other hydrothermal minerals, such as calcite, apophyllite, and analcime, form in the cavities of such rocks.

  • The role of argillic alteration in the zeolitization of

    The pseudomorphic replacement of glass shards by zeolite minerals is a common feature of volcanoclastic sediments. In the majority of cases the initial stage of this reaction is t

  • Glass and Rock Dissolution and Zeolitization

    Glass and Rock Dissolution and Zeolitization. Carol M. Jantzen, Ph.D. Cory L. Trivelpiece, Ph.D. Resumption of alteration (Stage III) Sudden increase in release rate of Marked by the large-scale precipitation of secondary mineral phases (zeolites)

  • Zeolitization processes in basic lavas of the Báucarit

    heulandite-clinoptilolite minerals associated with minor amounts of clay minerals and calcite (Cochemé et al., 1988; Münch and Cochemé, 1993). Rhyol~icfragments within the Báucarit are also altered to zeolites. Cochemé et al. (1988) and Münch and Cochemé (1993) attributed the process of zeolitization to

  • Volcanic agents of zeolitization in the Eastern Rhodopes

    Volcanic agents of zeolitization in the Eastern Rhodopes: ment process can produce zonal patterns parallel to outer clast surface (Fig. 1D). Therefore, the alteration grain size of volcanic glass on the mineral composition of its alteration products. Geochem., Mineral. and Petrol., 4, 83–90.

  • Salt-Thermal Zeolitization of Fly Ash Environmental

    The molten-salt method has been recently proposed as a new approach to zeolitization of fly ash. Unlike the hydrothermal method, this method employs salt mixtures as the reaction medium without any addition of water. In this study, systematic investigation has been conducted on zeolitization of fly ash in a NaOH−NaNO3 system in order to elucidate the mechanism of zeolite formation and to

  • Zeolitization of a basaltic flow in a continental

    The zeolitization of basanite lava flows in the Plateau des Coirons, Ardèche, France, is controlled by the initial location of the flows in paleorivers and by the thermal evolution of the flows during cooling. It predates the development of a well-defined columnar jointing. The zeolites (phillipsite and chabazite) are associated with ferro

  • Types of Wall Rock Alteration ~ Mining Geology

    Apr 30, 2015· Alteration is a complex process of ion exchange whereby some constituents are removed, others are added and still others are merely redistributed. The physical effects of alteration include recrystallization, changes in permeability and changes in colour.

  • On weathering and alteration of rocks RockMass

    Alteration is a process, which involves changes in the composition of the rock, most often caused by hydrothermal solutions or chemical weathering. Both processes, which generally first affect the walls of the discontinuities, lead to deterioration of the rock The fracture or cleavage of individual mineral

  • Dolomitization Wikipedia

    Dolomitization is a geological process by which the carbonate mineral dolomite is formed when magnesium ions replace calcium ions in another carbonate mineral, calcite.It is common for this mineral alteration into dolomite to take place due to evaporation of water in the sabkha area. Dolomitization involves substantial amount of recrystallization. This process is described by the

  • Biomineral‐Silica‐Induced Zeolitization of Equisetum

    Jun 17, 2003· Recently, laboratory zeolitization of silica cells from diatoms (single‐celled algae) providing a micro‐/macroporous material was reported. 9, 10 Crystallization of the zeolite was induced from seeds, since the reactivity of the fossilized biogenic silica seems to be very low, which does not allow direct crystallization of the zeolite.

  • 9. DIAGENETIC ALBITIZATION, ZEOLITIZATION, AND

    extensive alteration to mixed-layer clay minerals and chlorite. The frame-work constituents of Site 796, 797, and 799 sandstones have also been replaced to various degrees by carbonates, zeolites, clay minerals, anhy-drite, barite, pyrite, hematite, and microquartz (Site 797 only). Volcanic

  • Biomineralâ Silicaâ Induced Zeolitization of Equisetum Arvense

    zeolitization where easily accessible, highly reactive amor-phous silica is exposed. Leaves of the plant were subjected to hydrothermal treatment with a precursor solution that yielded silicalite-1 (MFI-type structure) crystals.[17] The crystallization of silica-lite-1 was accomplished after 24

  • In-situ application of Ultrasonic Pulse Velocity

    In this context, zeolitization is an alteration process in which metastable (vitric) components of an ignimbrite body are replaced by zeolite group of minerals under low temperature and pressure induced by hydrothermal activity.