Basalt grey fine grained volcanic rock

Basalt

Dark grey fine grained volcanic rock composed of plagioclase, pyroxene and olivine, with relatively low silica (45-52 wt %). The composition reflects an upper mantle origin. Basalt is the most common type of volcanic rock on Earth, and it erupts from mid-ocean spreading ridges and hot spots (e.g., Hawaii and Iceland). The intrusive coarsely crystalline igneous rock equivalent is called gabbro.

Geothermal Glossary

Word of the Week – Zircon

Word of the Week – Zircon

Zircon Zirconium silicate (ZrSiO4) is a minor or accessory mineral in igneous and metamorphic rocks. It contains measurable albeit minor amounts of uranium and lead, which make it amenable for radiometric dating. Zircons are some of the oldest dated minerals on...

Word of the Week – Zonal Isolation

Word of the Week – Zonal Isolation

Zonal Isolation The process of operationally isolating specific intervals or zones along a wellbore to perform well intervention activities, such as stimulation.

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