Fluid-inclusion evidence for previous higher temperatures in the Miravalles geothermal field, Costa Rica
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Abstract
Heating 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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Fluid-inclusion evidence for previous higher temperatures in the Miravalles geothermal field, Costa Rica |
| Series title | Geothermics |
| DOI | 10.1016/0375-6505(88)90030-2 |
| Volume | 17 |
| Issue | 5-6 |
| Year Published | 1988 |
| Language | English |
| Publisher | Elsevier |
| Description | 13 p. |
| First page | 681 |
| Last page | 693 |
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