The Geology of Jezero Crater, Observations & Findings |
The Geology of Jezero Crater, Observations & Findings |
Feb 24 2021, 01:41 AM
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Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
This thread is for those rockhounds among us to discuss the new terrain we'll see as Perseverance scoots around her new home. Let's get dirty & technical!
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Feb 27 2021, 05:38 PM
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Member Group: Members Posts: 311 Joined: 31-August 05 From: Florida & Texas, USA Member No.: 482 |
This image was cropped from the mastcam-z pan. It appears the wind scouring of the "holey rocks" at the base of the rover show a prevailing direction occurred for a long period of time. If aeolian deflation of the delta occurred, then the sediments likely were deposited in that direction. If the hardness of the holey rocks and delta deposits can be assessed, then the total mass lost to erosion would have an estimate. I also wonder if the wind helped scour some of those holes larger? |
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Feb 27 2021, 07:24 PM
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Member Group: Members Posts: 248 Joined: 25-February 21 From: Waltham, Massachussetts, U.S.A. Member No.: 8974 |
This image was cropped from the mastcam-z pan. It appears the wind scouring of the "holey rocks" at the base of the rover show a prevailing direction occurred for a long period of time. If aeolian deflation of the delta occurred, then the sediments likely were deposited in that direction. If the hardness of the holey rocks and delta deposits can be assessed, then the total mass lost to erosion would have an estimate. I also wonder if the wind helped scour some of those holes larger? Vesicular basalt can look a bit like the holey rocks: This example is from Hawaii and also has some Olivine in it. The texture is quite common in basalts and less common in pyroclastic deposits. The holes are trapped gas bubbles forming during degassing. Pumice would be an extreme example. I think these holey rocks would make an attractive target for testing all the instruments. Not sure if similarly textured rocks had been observed before and they seem to be in-situ, eg. bedrock which would help with understanding the mapped unit as a whole. -------------------- --
Andreas Plesch, andreasplesch at gmail dot com |
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Guest_Steve5304_* |
Feb 28 2021, 05:11 AM
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Guests |
Vesicular basalt can look a bit like the holey rocks: This example is from Hawaii and also has some Olivine in it. The texture is quite common in basalts and less common in pyroclastic deposits. The holes are trapped gas bubbles forming during degassing. Pumice would be an extreme example. I think these holey rocks would make an attractive target for testing all the instruments. Not sure if similarly textured rocks had been observed before and they seem to be in-situ, eg. bedrock which would help with understanding the mapped unit as a whole. If thats Vesicular basalt then isbit safe to say we havent landed in an area that was aquactic |
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Feb 28 2021, 05:35 AM
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Senior Member Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321 |
Opportunity and Curiosity both found rocks that were formed in aquatic environments. The shape of a rock isn't the only thing to know about it.
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