tag:blogger.com,1999:blog-37371348.post3548188111349819627..comments2023-11-05T03:45:19.337-05:00Comments on Apparent Dip: Closure TemperatureThermochronichttp://www.blogger.com/profile/08606230819461771700noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-37371348.post-57814696746243679132008-04-13T17:22:00.000-04:002008-04-13T17:22:00.000-04:00I just wish I could read this blog three months ag...I just wish I could read this blog three months ago. I'm a masters student and I just finished Radiogenic Isotopes.Unknownhttps://www.blogger.com/profile/12827598906384777615noreply@blogger.comtag:blogger.com,1999:blog-37371348.post-58226158603470319572008-02-07T18:16:00.000-05:002008-02-07T18:16:00.000-05:00Can't you just get really big apatites?Can't you just get really big apatites?C W Mageehttps://www.blogger.com/profile/09706100504739548720noreply@blogger.comtag:blogger.com,1999:blog-37371348.post-14178381972226317352008-01-28T20:43:00.000-05:002008-01-28T20:43:00.000-05:00Yup, that is certainly an issue with glasses, whic...Yup, that is certainly an issue with glasses, which is why attempts to use U-Th-He thermochronology on basaltic glasses hasn't worked so well. That isn't even room temperature, that is under ocean water temperature!<BR/><BR/>One of the papers I am working on talks a great deal about moderate temperatures and He diffusion in apatite (30-40°C), which given enough time can certainly fuck up results as well. Well, that's my point, but the anonymous reviewers didn't think it was important to write about!Thermochronichttps://www.blogger.com/profile/08606230819461771700noreply@blogger.comtag:blogger.com,1999:blog-37371348.post-73155314348119175372008-01-28T18:17:00.000-05:002008-01-28T18:17:00.000-05:00"Even at room temperature, for example, Ar and He ..."Even at room temperature, for example, Ar and He diffuse, just so slowly that it really doesn't make much of a difference."<BR/><BR/>Room temperature He diffusion can be fast enough to fuck up results. For example, the Heber et al. 2007 paper described <A HREF="http://lablemminglounge.blogspot.com/2007/10/experimentally-determined-d-values-for.html" REL="nofollow">here</A> addresses He diffusion out of the experimental glass between synthesis and analysis.C W Mageehttps://www.blogger.com/profile/09706100504739548720noreply@blogger.com