Smectite and smectite-illite clays are the predominant rock alteration products that form in the 50 to 200C zone over and adjacent to most high temperature volcanic-hosted, neutral pH geothermal systems (Browne, 1978). This smectite clay “cap” is an active component of the geothermal hydrology, often
The distribution of smectite coincides with gypsum, calcite and aragonite indicating that is associated with geothermal activities (Figure 4a). We believe that smectite is resulted from the hydrothermal alteration of Illite under the influence of h (Figure 4a and 4b).
Analysis of smectite clays in geothermal drill cuttings by the ...
2000年4月1日 · The estimation of the clay cation exchange capacity (CEC) from magnetotellurics identifies a layer of low-temperature smectite alteration in the south-western sub-basin sediments, interpreted...
Smectite quantification in hydrothermally altered volcanic rocks
2020年5月1日 · Our study provides the geothermal industry with a simple method to quantify the smectite weight fraction (pure smectite or expandable layers in mixed-layer clays) of powders from all kinds of altered volcanic rocks.
Contribution of the Paragenetic Sequence of Clay Minerals to …
2021年8月27日 · This paper revisits the clay mineralogy of the “smectite” alteration zone in the Krafla geo-thermal field via the study of an exploratory well in which temperatures range from 40 °C to 215 °C. The clay alteration consists of several mineral assemblages superimposed in time and space, resulting from different stages of water-rock interaction.
A trouble by smectite-amorphous silica precipitation happened at two production wells in the Onikobe Geothermal Power Station, northern part of Japan. It is considered that the reason of the down- hole scaling is caused by the mixing of two hds of fluids in …
Smectiteand smectite-illiteclays are the predominant rock alterationproducts that form in the 50 to zone in mast high temperature volcanic-hosted, neutral geothermal systems. Geothermal alteration assemblages including smectite or mixed-layer illite-smectite are typically found at temperatures below about Jennings and
High temperature smectites in active geothermal systems
2021年7月9日 · This paper revisits the clay mineralogy of the “smectite” alteration zone in the Krafla geo-thermal field via the study of an exploratory well in which temperatures range from 40 °C to 215 °C.
Sequential smectite-to-illite reaction via mixed-layer minerals (referred to hereafter as 'smectite illitization') has been documented in low-temperature crustal envir onments and is commonly associated with burial diagenesis, low-grade metamorphism, contact meta morphism and hydrothermal alteration.
Reaction Mechanisms of Smectite Illitization Associated with ...
2000年12月1日 · A hydrothermally altered rhyolitic hyaloclastite from Ponza island, Italy, has four alteration zones with unique clay assemblages: (1) a non-pervasive argillic zone characterized by smectite; (2) a propylitic zone with interstratified illite-smectite (I-S) containing 10–85% illite (I); (3) a silicic zone composed of I-S with S90% I and pure ...
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