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To: Haim R. Branisteanu who wrote (73368)4/20/2011 3:14:39 AM
From: Maurice Winn1 Recommendation  Read Replies (1) of 218888
 
Here is how oil forms.

Kilometres of oceanic sediment is carried on the oceanic crust conveyor belt to the subduction zones.

That sediment is loaded with organic material, shells and bones, from millions of years of accumulation of dead fish, whales, radiolarians and any number of other marine things falling to the bottom and being buried in more and more and more and more detritus.

At the subduction zone it plunges down hundreds of kilometres under the continental plates where it gets really hot and experiences super huge pressures. It cooks there for millions of years and is so hot that there's a big melt with the lighter components floating up through the liquid.

There is a lot of chemistry that happens at such temperatures and pressures in an anoxic environment.

Some of the hydrocarbons float into magma chambers. Some floats into sedimentary layers, perhaps through zeolites to be formed into different molecules. Much of the hydrocarbon is disassociated all the way to methane - hence the big gas fields.

The hydrocarbons float upward until trapped or leaking back to the surface.

The hydrocarbons that collect in magma chambers provide the fuel for the big gaseous volcanic eruptions which are totally different from the Hawaiian type volcanoes which are sourced not from subduction zones but from upwelling by magma which was stripped of its hydrocarbons and other lighter molecules during the subduction process.

The liquids such as CO2 and H2O provide expansionary upward pressure to propel the eruption upwards when the pressure is reduced enough above [such as when the sun and moon are aligned for a high tide] or when lake levels are low. As the liquids turn to gases, the volume becomes enormous.

As the hydrocarbons reach the air, they start burning in a megaton explosion to the sky [umpteen megatons in the case of a Taupo eruption].

That's my theory anyway and it fits all the facts which other theories fail to explain [such as accumulating fish in sedimentary layers which are increasingly buried and then heated].

Mqurice
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