dorsal/arxiv
View SchemaModification of streaming potential by precipitation of calcite in a sand-water system: laboratory measurements pH range from 4 to 12
| Authors | Xavier Guichet, Laurence Jouniaux, Nicole Catel |
|---|---|
| Categories | |
| ArXiv ID | physics/0610239 |
| URL | https://arxiv.org/abs/physics/0610239 |
| DOI | 10.1111/j.1365-246X.2006.02922.x |
| Journal | Geophysical Journal International 166 (2006) 445-460 |
Abstract
Spontaneous Potentials associated with volcanic activity are often interpreted by means of the electrokinetic potential, which is usually positive in the flow direction (i.e. Zeta potential of the rock is negative). The water-rock interactions in hydrothermal zones alter the primary minerals leading to the formation of secondary minerals. This work addresses the study of calcite precipitation in a sand composed of 98% quartz and 2% calcite using streaming potential measurements. The precipitation of calcite as a secondary mineral phase, inferred by high calcite saturation indices and by a fall in permeability, has a significant effect on the electrokinetic behaviour, leading to a significant reduction in the Zeta potential (in absolute value) and even a change in sign. The measured decrease in Zeta potential from -16 mV to -27±4 mV takes place as the pH rises from 4 to 7, while it remains constant at -25±1 mV as the pH increases from 8 to 10.5. For pH higher than 10.5, calcite precipitates and is expected to coat the quartz surface. The measured Zeta potential vary from -17 to +8 mV for pH ranging from 10.6 to 11.7 depending on the amount of precipitated calcite indicated by the decrease in permeability. The observed change in sign of the electrical surface potential rules out the usual qualitative interpretation of SP anomalies in order to determine fluid circulations, even at pH lower than 9 if calcite is widely present as a secondary mineral phase, since the electrical surface potential of calcite depends also on CO2 partial pressure and [Ca2+]. Therefore SP anomalies as measured in hydrothermal field, without mineralogical analyses of hydrothermal deposits, and without geochemical fluid survey, should be interpreted with caution.
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"abstract": "Spontaneous Potentials associated with volcanic activity are often\ninterpreted by means of the electrokinetic potential, which is usually positive\nin the flow direction (i.e. Zeta potential of the rock is negative). The\nwater-rock interactions in hydrothermal zones alter the primary minerals\nleading to the formation of secondary minerals. This work addresses the study\nof calcite precipitation in a sand composed of 98% quartz and 2% calcite using\nstreaming potential measurements. The precipitation of calcite as a secondary\nmineral phase, inferred by high calcite saturation indices and by a fall in\npermeability, has a significant effect on the electrokinetic behaviour, leading\nto a significant reduction in the Zeta potential (in absolute value) and even a\nchange in sign. The measured decrease in Zeta potential from -16 mV to\n-27\u0026plusmn;4 mV takes place as the pH rises from 4 to 7, while it remains\nconstant at -25\u0026plusmn;1 mV as the pH increases from 8 to 10.5. For pH higher\nthan 10.5, calcite precipitates and is expected to coat the quartz surface. The\nmeasured Zeta potential vary from -17 to +8 mV for pH ranging from 10.6 to 11.7\ndepending on the amount of precipitated calcite indicated by the decrease in\npermeability. The observed change in sign of the electrical surface potential\nrules out the usual qualitative interpretation of SP anomalies in order to\ndetermine fluid circulations, even at pH lower than 9 if calcite is widely\npresent as a secondary mineral phase, since the electrical surface potential of\ncalcite depends also on CO2 partial pressure and [Ca2+]. Therefore SP anomalies\nas measured in hydrothermal field, without mineralogical analyses of\nhydrothermal deposits, and without geochemical fluid survey, should be\ninterpreted with caution.",
"arxiv_id": "physics/0610239",
"authors": [
"Xavier Guichet",
"Laurence Jouniaux",
"Nicole Catel"
],
"categories": [
"physics.geo-ph"
],
"doi": "10.1111/j.1365-246X.2006.02922.x",
"journal_ref": "Geophysical Journal International 166 (2006) 445-460",
"title": "Modification of streaming potential by precipitation of calcite in a sand-water system: laboratory measurements pH range from 4 to 12",
"url": "https://arxiv.org/abs/physics/0610239"
},
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