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Gold/Mining/Energy : Gold and Silver Juniors, Mid-tiers and Producers
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To: E. Charters who wrote (32251)2/8/2007 10:51:52 AM
From: hank2010  Read Replies (1) of 78421
 
Dietz originally postulated in the mid 60's that the meteorite contained nickel. That concept was dismissed by the majority of the scientists working on the sudbury event. It is generally agreed that the meteor struck an area where there existed an ni/cu rich ultramafic body. from Naldrett "there is a growing body of isotopic evidence that the complex is an impact melt that incorporated Ni, Cu and PGE bearing mafic and/or ultramafic rocks that were already present in the target area (Keays and Lightfoot, 1999; Cohen et al., 2000)"

Naldrett also answers your questions about temperatures.

"the most recent major contribution to our understanding of sudbury comes from the use of a modified computer code developed at Los Alamos (Amsden et al, 1980) to simulate the behavior and temperature of target rocks during a cratering event. Ivanov and Deutsch (1999) applied this to sudbury and then used heat flow equations to estimate temperature variations in the resulting impact melt. their calculations indicate that the maximum temperature within a 2.5 km thick impact melt sheet would be about 2000 degrees K at the time of impact and that the temperature would remain above 1450 degrees K which is the approximate liquidus, for 250,000 years. This extended period of superheat explains many features .... it also explains the distribution of the sulphide ore"
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