Mount Sharp - Extended Mission 1 - Page 64

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Faceless


Posts: xxx

Reply: 1261



PostPosted: March 23, 2016 9:48 AM 

Microbes formed ooids on Mars:
[link]

Faceless


Posts: xxx

Reply: 1262



PostPosted: March 24, 2016 8:29 AM 

Will someone please delete my above post?

Faceless


Posts: xxx

Reply: 1263



PostPosted: March 28, 2016 1:42 AM 

Murchison meteorite originated from Mars:
[link]

Faceless


Posts: xxx

Reply: 1264



PostPosted: March 29, 2016 8:45 AM 

Martian ooids found near Naukluft Plateau:
[link]

Faceless


Posts: xxx

Reply: 1265



PostPosted: March 31, 2016 3:36 AM 

Geology does not form ooids:
[link]

Faceless


Posts: xxx

Reply: 1266



PostPosted: April 3, 2016 7:40 AM 

Ubiquitous ooids found on Naukluft Plateau:
[link]

LWS


Posts: xxx

Reply: 1267



PostPosted: April 3, 2016 9:34 AM 

Faceless:

Would you say that the classic Meridiani berries are Ooids?

Winston

Faceless


Posts: xxx

Reply: 1268



PostPosted: April 3, 2016 9:55 AM 

I am not sure yet.If the classic Meridiani berries possess nucleus, it is another story.

Faceless


Posts: xxx

Reply: 1269



PostPosted: April 3, 2016 10:51 AM 

Many people have said that the Martian blueberries are ooids. That hypotheses lack convincing evidence and does not gain wide acceptance. However, I am thinking along that line. Dr.Squire (leader of the NASA team) once said the berries possess concentric structures. If there are clear evidence for nucleus in the berries, then I would say the berries may be mega ooids for the following reasons:
1. Catastrophe on Earth, such as mass extinctions, produce ooids in extraordinary numbers. Mars life ended in a catastrophe, which provides abundant food for microbes to produce ubiquitous mega ooids. So, sizes are not a problem for microbes after catastrophe.
2. Some ooids on Earth are made of iron carbonate instead of carbonate.
3. Besides mega ooids, there are pisolite, which are similar to ooids.

Faceless


Posts: xxx

Reply: 1270



PostPosted: April 3, 2016 11:07 AM 

Pisolite is described in
https://en.wikipedia.org/wiki/Pisolite
Pisolite possesses the same size and the same exterior shape as the martian berries. Ooids are produced by microbes. Pisolite may be produced by microbes, too.

Al


Posts: 7

Reply: 1271



PostPosted: April 3, 2016 1:02 PM 

Interesting. May some pisolites have "stems", like some marsberries?

Faceless


Posts: xxx

Reply: 1272



PostPosted: April 4, 2016 11:24 AM 

I find no pisolites that possess "stems". If the stems are integral parts of some marsberries, then those some marsberries may not be pisolites. By the way, I think pisolites are the same as ooids, except difference in sizes. Their different names arise from artificial classification that defines sand as smaller than 2 mm in diameter. I also found that pisolites actually exist together with ooids, as shown in this photo:
https://www.flickr.com/photos/fossil_lin/26202673766/in/dateposted-public/

Faceless


Posts: xxx

Reply: 1273



PostPosted: April 5, 2016 6:25 AM 

Ooids Found in Martian Meteorite ALH 84001: [link]

LWS


Posts: xxx

Reply: 1274



PostPosted: April 5, 2016 4:27 PM 

Faceless (Lin Liantang)

The below sol 1300 Curi image is a MAHLI view of a surface that I think has not been subjected to a ratting process and therefore the small spherules are not deposits from such a process. They are about 90 uM average diameter. They present in a range of colours, dark blue to green to tan. Most are tan coloured.

Do you think that they might be Ooids?

Winston

LWS


Posts: xxx

Reply: 1275



PostPosted: April 5, 2016 4:41 PM 

Here's a cropped X-eyed 3D of the sol 1300 image. The spherules don't look like dust or rat scrapings to me.

Winston

Faceless


Posts: xxx

Reply: 1276



PostPosted: April 6, 2016 12:52 AM 

Re 1274, yes, they may be ooids. To the right of the following raw image are ooids too:
http://mars.nasa.gov/msl/multimedia/raw/?rawid=1300MH0001900010500320C00_DXXX&s=1300
A few of the ooids in the above photo are spherical (globular), which is more convincing as ooids.

Faceless


Posts: xxx

Reply: 1277



PostPosted: April 9, 2016 10:41 PM 

Microbes produced ooids on Mars:
[link]

Faceless


Posts: xxx

Reply: 1278



PostPosted: April 10, 2016 4:40 AM 

What are these particles on the ground? [link]

john radogno


Posts: 37

Reply: 1279



PostPosted: April 10, 2016 11:00 PM 

Thanks for the link in 1277. A nice presentation.

Faceless


Posts: xxx

Reply: 1280



PostPosted: April 11, 2016 12:44 PM 

There is really good hope for finding living or recently living microbes on Mars:
[link]

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