Timeline for When diamonds "migrate" from deep underground to the surface, do they maintain pressure inside when there is no more pressure outside? If so, how?
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
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| Nov 27, 2021 at 11:51 | comment | added | uhoh | @Gimelist I was once labeled as a resident stickler in Space SE; I keep it in my profile. I've always been one of those people for which the real word is of secondary importance :-) | |
| Nov 27, 2021 at 11:41 | comment | added | Gimelist | @uhoh Let me rephrase: incompressible for all practical purposes. | |
| Nov 27, 2021 at 11:34 | comment | added | uhoh | @Gimelist well nothing is absolutely incompressible, but diamond does have a very large bulk modulus. I think diamond is used in anvil cells for its hardness and strength more-so than for it's modulus; pressure is pressure. | |
| Nov 27, 2021 at 10:54 | comment | added | Gimelist | @uhoh yes. Diamond is incompressible. This is why they use diamond in "diamond anvil cells", to simulate deep conditions in the Earth. Diamond is also "indecompressible". That is, minerals that formed at high pressure and are trapped inside diamond, don't know that the pressure is now atmospheric once the diamond is on Earth's surface. As far as the minerals case, they're still in the deep mantle. | |
| Nov 15, 2021 at 5:17 | comment | added | Knob Scratcher | You're asking if formation pressure is ever preserved in any mineral found outside of that formation environment. The short answer is no. What gets preserved is equilibrium crystallography for that chemistry at that pressure/temperature regime. It's why you can find sand grains alongside shocked quartz on the surface in impact craters, and why specific minerals are used to elucidate P/T conditions at formation. | |
| Nov 14, 2021 at 4:49 | comment | added | uhoh | Perhaps the relevant aspect of diamond's "unique crystalline covalent bonding structure" is its bulk modulus of ~445 GPa? | |
| S Nov 14, 2021 at 4:30 | review | First answers | |||
| Nov 14, 2021 at 11:25 | |||||
| S Nov 14, 2021 at 4:30 | history | answered | Thomas Perry | CC BY-SA 4.0 |