Rocks behind the Casino

Back to the future with a demonstration of the capacity of our bodies for heat flux storage and release as in a flux capacitor.

Magnetite/Hematite Iron Oxides:
Iron Valence electrons: divalent Ferrous 2-, trivalent Ferric 3-, Oxygen 2+

Polymorphs:
Black Magnetite (Fe3O4) or (Fe+2 + 2*Fe+3 + 4*O-2) has Ferrous.
Red Hematite (Fe2O3) or (2*Fe+3 + 3*O-2) no Ferrous.

Ferrous iron ions have an unpaired electron in their outermost energy level, which is responsible for the magnetic properties of magnetite although some would beg to differ.

MH Buffer:
4 Fe3O4 + O2 ⇌ 6 Fe2O3

Iron in magma reacts with oxygen forming magnetite then magnetite reacts with more oxygen to produce hematite, and the mineral pair ratio forms a buffer that can control how oxidizing its environment is and controls igneous rock types (oxygen flux capacitance fugasity). So a little bit of magnetite in all igneous rocks and so all are slightly magnetic. Below the water table, rocks, magma are in a oxidizing state so no hematite. At near surface epithermal temperatures (low fugasity) a reducing state for hematite (and sulfides) formation exists. There is no free oxygen above above 700F, just water vapor and hydrogen gas. This all doesn't quite add up to me so more reading is needed here.

FMQ Buffer: fayalite-magnetite-quartz (fayalite is olivine):
3 Fe2SiO4 + O2 ⇌ 2 Fe3O4 + 3 SiO2

Other Redox Buffers:
https://en.wikipedia.org/wiki/Mineral_redox_buffer

Epithermal Boiling Points for Gold Deposits
Depth ft P atm T boiling F
0 1 212
100 3 274
500 15 387
2000 60 517
5280 160 636
10560 300 730

Lake Mead Elevations:
https://www.usbr.gov/lc/region/g4000/lakemead_bar.pdf
Full 1220 ft Jan 2000
Current 1062 ft
Lowest 1040 ft Jul 2022

The Back to the Future Theme on Youtube:
https://www.youtube.com/watch?v=e8TZbze72Bc

John Fogerty on Youtube:
https://www.youtube.com/watch?v=uNKlmKv_J4w