ODH019: Magmatic-hydrothermal systems and the formation of epithermal deposits - Jeffrey Hedenquist 

Where will the next discovery be? 😏

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The transition is typically ~1 km below the paleosurface. The Lepanto lithocap and enargite-Au deposit, offset from the deeper Far Southeast porphyry, is typical of this relationship. The epithermal environment at

The cartoon's vertical scale is important, where would the Moho be placed relative to the base of porphyry, assuming the porphyry is a cooled residual magma chamber that once in the past had a much lower viscosity than its surrounding lithosphere. The magma chamber viscosity models to be dependent on the proportions of crystal to fluid bound by the walls of the magma chamber. Work is done by both conductive and convective forces acting in the magma chamber, exerting a differential pressure and temperature across a solvus surface that is the boundary of the magma chamber. The magma chamber can be characterized as a 3-cycle Carnot motor doing work on upper lithosphere, fueled by the free energy released through weak force K and U decay events, generating both local density and temperature changes within the magma chamber.

All Ore Hub talks are on YouTuba a day or two after presentation. Antonio's talk on advanced argillic alteration is at: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-OcnO5wHPmeY.html Also a talk on the same subject, in Spanish , at: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-1_z_wRSTukI.html