Fluid-Inclusion Evidence For Previous Higher Temperatures In The Miravalles Geothermal Field, Costa Rica
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Journal Article: Fluid-Inclusion Evidence For Previous Higher Temperatures In The Miravalles Geothermal Field, Costa Rica
AbstractHeating and freezing data were obtained for liquid-rich secondary fluid inclusions in magmatic quartz, hydrothermal calcite and hydrothermal quartz crystals from 19 sampled depths in eight production drill holes (PGM-1, 2, 3, 5, 10, 11, 12 and 15) of the Miravalles geothermal field in northwestern Costa Rica. Homogenization temperatures for 386 fluid inclusions range from near the present measured temperatures to as much as 70°C higher than the maximum measured well temperature of about 240°C. Melting-point temperature measurements for 76 fluid inclusions suggest a calculated salinity range of about 0.2-1.9 wt% NaCl equivalent. Calculated salinities as high as 3.1-4.0 wt% NaCl equivalent for 20 fluid inclusions from the lower part of drill hole PGM-15 (the deepest drill hole) indicate that higher salinity water probably was present in the deeper part of the Miravalles geothermal field at the time these fluid inclusions were formed.
- Keith E. Bargar and Robert O. Fournier
- Published Journal
- Geothermics, 1988
- Not Provided
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Keith E. Bargar,Robert O. Fournier. 1988. Fluid-Inclusion Evidence For Previous Higher Temperatures In The Miravalles Geothermal Field, Costa Rica. Geothermics. (!) .