Geothermal studies of the Outokumpu Deep Drill Hole, Finland: Vertical variation in heat flow and palaeoclimatic implications

• Published in: Physics of the Earth and Planetary Interiors
• Main Authors: Kukkonen, I. T., Rath, V., Kivekäs, L., Šafanda, J. (Jan), Čermák, V. (Vladimír)
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2011
• Subjects: heat flow; geothermal gradient; thermal conductivity; paleoclimatology; Fennoscandian Shield; Fennoscandian
• Online Access: https://doi.org/10.1016/j.pepi.2011.06.002; http://hdl.handle.net/11104/0200491

Detailed geothermal studies of deep drill holes provide insights to heat transfer processes in the crust, and allow separation of different factors involved, such as palaeoclimatic and structural conductive effects as well as advective fluid flow effects. We present high resolution geothermal results of the 2516 m deep Outokumpu Deep Drill Hole in eastern Finland drilled in 2004–2005 into a Palaeoproterozoic formation with metasedimentary rocks, ophiolite-derived altered ultramafic rocks and pegmatitic granite. The down-hole temperatures have been logged five times after end of drilling and extend to day 948 after drilling.