Author Topic: Chang'e 4  (Read 2702 times)

Offline bknight

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Re: Chang'e 4
« Reply #30 on: January 16, 2019, 10:16:22 PM »
Wow.

Just wow!

Is the crater that the lander was heading toward just prior to pitch over have a name or is it too small?
Truth needs no defense.  Nobody can take those footsteps I made on the surface of the moon away from me.
Eugene Cernan

Offline Dalhousie

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Re: Chang'e 4
« Reply #31 on: May 16, 2019, 04:54:35 AM »
Wow.

Just wow!

Is the crater that the lander was heading toward just prior to pitch over have a name or is it too small?

Possibly Zhinyu

Offline Dalhousie

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Re: Chang'e 4
« Reply #32 on: May 16, 2019, 04:57:31 AM »
The Chang'e 4 team published a paper in Nature today describing the discovery of olivine and low calcium pyroxene-rich rocks consistent with them being derived from the lunar mantle. Such rocks have been long predicted from Aiken Basin and were the prime reason for sending the mission there.  Mantle rocks are not represented in the Luna or Apollo samples, or in any lunar meteorites.

Offline bknight

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Re: Chang'e 4
« Reply #33 on: May 16, 2019, 09:00:17 AM »
The Chang'e 4 team published a paper in Nature today describing the discovery of olivine and low calcium pyroxene-rich rocks consistent with them being derived from the lunar mantle. Such rocks have been long predicted from Aiken Basin and were the prime reason for sending the mission there.  Mantle rocks are not represented in the Luna or Apollo samples, or in any lunar meteorites.

Is there a geological/planetary reason that those rocks were not found on the near side of the Moon?
Truth needs no defense.  Nobody can take those footsteps I made on the surface of the moon away from me.
Eugene Cernan

Offline Dalhousie

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Re: Chang'e 4
« Reply #34 on: May 17, 2019, 01:46:14 AM »
The Chang'e 4 team published a paper in Nature today describing the discovery of olivine and low calcium pyroxene-rich rocks consistent with them being derived from the lunar mantle. Such rocks have been long predicted from Aiken Basin and were the prime reason for sending the mission there.  Mantle rocks are not represented in the Luna or Apollo samples, or in any lunar meteorites.

Is there a geological/planetary reason that those rocks were not found on the near side of the Moon?

The reason for the South Pole-Aiken Basin being associated with olivine and other mantle related minerals  is because it is the largest (2,500 km) and currently deepest (13 km) impact basin. Its transient depth may have been as much as 200 km. Thus it is thought to have excavated deep into the mantle. The SPAB has been infilled over the Aeons, so the best place to look for mantle rocks is along the walls, and of course in the ejecta.

Some smaller near side impacts may have done also, because of the lesser crustal thickness.  Kaguya mission data shows that Mare Crisium in particular has olivine rich, and thus possibly mantle derived, material along its rim.  But because of its depth of excavation the SPAB has always been the preferred site for investigations.A preference the Chang'e 4 team appear to have vindicated.


Offline bknight

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Re: Chang'e 4
« Reply #35 on: May 17, 2019, 09:27:32 AM »
Ok on the big impact, but another question came to me yesterday, didn't the guys find an olivine rock during A15? The so called genesis rock?
Truth needs no defense.  Nobody can take those footsteps I made on the surface of the moon away from me.
Eugene Cernan

Offline raven

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Re: Chang'e 4
« Reply #36 on: May 19, 2019, 04:15:38 AM »
Ok on the big impact, but another question came to me yesterday, didn't the guys find an olivine rock during A15? The so called genesis rock?
According to this report at least, the Genesis Rock only contained trace amounts of olivine, if that, at least  from my reading.

Offline Dalhousie

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Re: Chang'e 4
« Reply #37 on: May 19, 2019, 11:56:10 PM »
Ok on the big impact, but another question came to me yesterday, didn't the guys find an olivine rock during A15? The so called genesis rock?

That was anorthosite, which is from the primordial crust, not the mantle.