tag:blogger.com,1999:blog-20092824.post3223116471067321558..comments2024-01-30T19:45:36.648+11:00Comments on Lounge of the Lab Lemming: Tourmaline lemonadeC W Mageehttp://www.blogger.com/profile/09706100504739548720noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-20092824.post-31095052331295002752014-05-17T15:59:21.664+10:002014-05-17T15:59:21.664+10:00Yes, the equilibrium is between two independent fa...Yes, the equilibrium is between two independent faces and the"medium". So you divide D c-axis/melt by D a-axis/melt. But all xals get less choosy at high T, due to the TdS term in Gibb's free energy. It is the same reason isotopic fractionation decreases at higher T.C W Mageehttps://www.blogger.com/profile/09706100504739548720noreply@blogger.comtag:blogger.com,1999:blog-20092824.post-62073700842114859032014-05-17T11:39:51.337+10:002014-05-17T11:39:51.337+10:00Sure, but equilibrium thermodynamics plays a backs...Sure, but equilibrium thermodynamics plays a backseat here, right? Approach to equilibrium can't be driving the partitioning (at least, not in the tourmaline) because there is no exchange between the two "phases". If it's an equilibrium effect, I guess it's between the interstitial medium and the crystal interface, so the effective "partition coefficient" is Isotopicnoreply@blogger.comtag:blogger.com,1999:blog-20092824.post-33938466527307359272014-05-17T10:19:50.791+10:002014-05-17T10:19:50.791+10:00As a general rule, partitioning should get smaller...As a general rule, partitioning should get smaller at higher T in any generalized thermodynamic system, because less segregated systems have higher entropy. C W Mageehttps://www.blogger.com/profile/09706100504739548720noreply@blogger.comtag:blogger.com,1999:blog-20092824.post-16907706223337789702014-05-17T06:26:19.104+10:002014-05-17T06:26:19.104+10:00That's pretty weird! Tough to say where the te...That's pretty weird! Tough to say where the temperature relationship comes from. Seems unlikely to be a real equilibrium process - more likely a temperature controlled kinetic effect?Isotopicnoreply@blogger.comtag:blogger.com,1999:blog-20092824.post-43137504737956002742014-05-17T04:54:50.094+10:002014-05-17T04:54:50.094+10:00That is SO COOL! Thanks!That is SO COOL! Thanks!Chris Phoenixhttps://www.blogger.com/profile/13368959552769808835noreply@blogger.com