Stories
Slash Boxes
Comments

SoylentNews is people

posted by mrpg on Saturday December 08 2018, @09:23AM   Printer-friendly
from the if-god-isn't-real-who-tricks-scientists? dept.

Phys.org:

Scientists long believed that Earth's lower mantle was composed of Bridgmanite (Mg,Fe)SiO3 and magnesiowüstite (Mg,Fe)O, in which Fe2+ dwells. This view changed when experiments showed that Fe2+ simply can't exist at the pressure and temperature of the lower mantle. What is present is Fe3+. The two phases (Mg,Fe)SiO3 and (Mg,Fe)O both shed Fe2+ and, in turn, MgSiO3 and MgO remain. However, what mineral hosts Fe3+ had remained unknown.

Now, scientists have a possible answer: Maohokite, a newly discovered high-pressure mineral. It may be what composes the Earth's lower mantle along with Bridgmanite MgSiO3 and magnesiowüstite MgO. The study reporting this new mineral was published in Meteoritics & Planetary Science.

[...] Maohokite, with a composition of MgFe2O4, has an orthorhombic CaFe2O4-type structure. The existing mineralogical model of the Earth's mantle shows that the ferromagnesian lower mantle is mainly composed of Bridgmanite (Mg,Fe)SiO3 and magnesiowüstite (Mg,Fe)O. Therefore, the fact that Maohokite contains Mg and Fe, two major components of the lower mantle, only makes the case stronger that Maokohite is a key mineral in the lower mantle.

The researchers were under a lot of pressure to produce this result.


Original Submission

 
This discussion has been archived. No new comments can be posted.
Display Options Threshold/Breakthrough Mark All as Read Mark All as Unread
The Fine Print: The following comments are owned by whoever posted them. We are not responsible for them in any way.
  • (Score: 2) by fritsd on Saturday December 08 2018, @12:56PM

    by fritsd (4586) on Saturday December 08 2018, @12:56PM (#771511) Journal

    That doesn't sound like such a bad idea: X-ray crystallography [wikipedia.org]

    I don't know if you'd have enough time to observe the new position of the Mg and Fe atoms in the deformed crystal after the shockwave, before the sample container and X-ray detectors get blown up.
    Also maybe it would take some time for the compound to "settle" and recrystallize, like if you melt Sulfur, the chewing gum like light brown stuff takes a short while to crystallize to β and then a longer while for that
    to crystallize to the room-temperature α form (from wiki [wikipedia.org]).

    Starting Score:    1  point
    Karma-Bonus Modifier   +1  

    Total Score:   2