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Gold/Mining/Energy : Geology, mining and assorted terminology thread
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To: Francoise Kartha who wrote (75)1/3/1997 6:21:00 PM
From: LaFayette555   of 110
 
Hi there Francoise.

In my 'book' a scarn is an altered limestone CaCO3 or dolomite CaMgCO3, the rare exception is when a skarn forms in a 'carbonatite'
a type of magmatic rock.

Limestone & dolomite are exclusively of sedimentary origin.

The alteration being that when submitted to heat, usually from intrusion
of the limestone by a magmatic body, the CaCO3 turns into CaO + CO2, the CO2 being a type of fluid it facilitates the penetration of mineral bearing solutions into the limestone,( which is itself a marble by that time) thus the irregular shape of the deposit formed by this
penetration of fluids.

Any one that can add to or correct this interpretation is welcomed!
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