Why Neo-Plutons Are Deeper in Extension Tectonic Fields and Shallower in Contraction Tectonic Fields?
- Conference
- New Zealand Geothermal Workshop
- Year
- 1998
- Session
- IEA - Deep Geothermal Resources
- Language
- English
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Abstract
Neo-plutonic bodies are often encountered beneath the contraction tectonic geothermal fields in 2-4 boreholes but are rarely reported the extension fields. This leads to a hypothesis that tectonic over-stress in the contraction fields amplifies the upper crustal density and magma buoyancy, so that magma rises to a shallow depth. A difference in the density of diamond drill cores obtained extension and contraction fields demonstratesthis hypothesis
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