Here I want to concentrate on another source of error, namely, processes that take place within magma chambers. To me it has been a real eye opener to see all the processes that are taking place and their potential influence on radiometric dating. Radiometric dating is largely done on rock that has formed from solidified lava. Lava properly called magma before it erupts fills large underground chambers called magma chambers.
Kevin Rogers submitted a comment to that article reproduced below, edited to focus on substantive issues , to which Dr Jim Mason replies. Andrew Kulikovsky spoke on one occasion and John Hartnett spoke on 2 occasions. However, we are a house divided. It can be experimentally confirmed that molten Zircon rejects lead. This is highly significant, as it means that the initial conditions are known to a high level of confidence. Jim Mason made no reference to the Concordia line and I could not find any reference to the Concordia line on any articles on the CMI website, even though it is well known e. Jim raised the issue of Helium concentrations in Zircon.