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Unmanned Spaceflight.com > All posts by a member| Posted on: Mar 21 2013, 05:28 AM | |
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Member  Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741 
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Thanks it sounds like a plausible scenario...on another theme, dont know why they only mention D/H isotope ratio of water which I understand it relates to the age of the rocks but no mention so far of isotopic ratios of sulphur and carbon! |
| Forum: MSL · Post Preview: #199244 · Replies: 842 · Views: 467673 |
| Posted on: Mar 20 2013, 05:43 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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I hope I'm getting this right but being a layman in geology I have to make an extra effort to understand whats being said and what it means.. before Curiosity rover, I had the impression that sulphate rock as typified by rocks found at the Meridiani site was a rock type completely separate from the phyllosilicate detected from orbit at the Endeavour crater rim site. We were told this probably signified a transition in climate from a neutral Mars to a more acidic environment as Mars was drying up. Now that we have analysed the rock site at YB by Curiosity, does it look like sulphate and phyllosilicate are to be found within the same rock and if that is so, how would one explain that?? |
| Forum: MSL · Post Preview: #199231 · Replies: 842 · Views: 467673 |
| Posted on: Mar 12 2013, 09:57 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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D/H ratio is given importance but they fail to mention if I'm not mistaken the ratio of isotopes if any of the sulphur and carbon detected in the SO2 and CO2 gas. |
| Forum: MSL · Post Preview: #198973 · Replies: 842 · Views: 467673 |
| Posted on: Feb 3 2013, 02:33 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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Its amazing how martian dust can colour everything red. Who would have thought that this part of Mars was so grey! |
| Forum: MSL · Post Preview: #197605 · Replies: 842 · Views: 467673 |
| Posted on: Jan 16 2013, 10:27 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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QUOTE (serpens @ Jan 16 2013, 10:22 PM)  The most likely vehicles for calcium sulphate to achieve super-saturation and precipitate out in veins are temperature drop (CaSO4 solubility decreases with temperature), a reasonable pressure change or the mixing of two incompatible waters where cation rich solution (calcium, barium, sodium etc) encounters acidic sulphate rich water. So the sulphates could have precipitated out due to cooling or pressure drop as hydrothermally driven groundwater approached the surface via fractures. Alternatively basalt buffered cation rich groundwater could have encountered acidic sulphate rich water close to the surface and the sulphates precipitated in a mixing interface. I missed the telecom brief. While calcium sulphate dominated was there any mention of other sulphates such as Na2SO4 in the mix? no mention of Na2SO4 |
| Forum: MSL · Post Preview: #196953 · Replies: 913 · Views: 516638 |
| Posted on: Jan 16 2013, 01:52 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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Correct if Im wrong..the high calcium content is from the veins along fractures within the rock most likely in the form of calcium sulphate. Does this mean that the water flowing along the fractures was acidic? What about the composition of the bedrock itself? Im not sure whether they ever mentioned anything about its make up and pH of the water these sediments were deposited in? |
| Forum: MSL · Post Preview: #196917 · Replies: 913 · Views: 516638 |
| Posted on: Dec 19 2012, 03:09 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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Curiosity's latest update states that rock analysis by APXS and ChemChem have been made and yet no word as yet regarding any rock chmistry we might be dealing with here?! |
| Forum: MSL · Post Preview: #195993 · Replies: 913 · Views: 516638 |
| Posted on: Nov 26 2012, 11:32 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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I suppose that the Glenelg bedrock composition would have been identified by CRISM on MRO??! |
| Forum: MSL · Post Preview: #194840 · Replies: 913 · Views: 516638 |
| Posted on: Nov 22 2012, 05:03 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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QUOTE (nprev @ Nov 22 2012, 04:57 PM) ...for what purpose? MAHLI is the right instrument. The idea is to emulate field geologist methods, and the resolution provided is ideal for minerological characterization. Curiosity may be on the verge of opening up a new chapter in Mars exploration that goes beyond geology. I probably am not allowed to mention the word in this forum. |
| Forum: MSL · Post Preview: #194680 · Replies: 520 · Views: 732940 |
| Posted on: Nov 22 2012, 04:52 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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I believe we're going to need a better instrument than MAHLI for the next rover mission. An electron microscope perhaps?? |
| Forum: MSL · Post Preview: #194675 · Replies: 520 · Views: 732940 |
| Posted on: Oct 1 2012, 10:56 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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New pictures of rock and sand just been posted on ps blog.To my inexperienced eyes, if I come across this rock here on Earth, I would say its a metal of some sort!! So smooth and shiny with fine sand on it! |
| Forum: MSL · Post Preview: #192575 · Replies: 587 · Views: 801618 |
| Posted on: Sep 7 2012, 01:55 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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Could anyone recall the composition of Wopmay back in Endurance crater and the chocolate hills at Conception crater!?? I see a resemblance in these rocks here !! |
| Forum: Opportunity · Post Preview: #190818 · Replies: 581 · Views: 213468 |
| Posted on: Sep 6 2012, 01:24 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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I am just wondering why the difference in colours particularly between the Erebus panorama and the rest?? How would the real Mars look to the human eye standing on the surface? I also noted the difference between the martian landscape colour between Curiosity Gale site and the Oppy panoramas that we have been used to, the latter being something more reddish and Gales pinker and lighter? Again which would be the most real landscape to view in real colour?? |
| Forum: Opportunity · Post Preview: #190718 · Replies: 6 · Views: 12889 |
| Posted on: Aug 16 2012, 05:22 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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QUOTE (fredk @ Aug 16 2012, 06:10 PM) The crism data is pretty low resolution, so the estimates I've heard are very roughly half way down CY. a couple hundred metres away? |
| Forum: Opportunity · Post Preview: #188806 · Replies: 108 · Views: 263732 |
| Posted on: Aug 16 2012, 04:37 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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I recall from CRISM data that there should be phyllosilicates somewhere along the eastern rim of Cape York. How far would Opportunity be from this point in reaching such rocks? Anyone has any idea? |
| Forum: Opportunity · Post Preview: #188797 · Replies: 108 · Views: 263732 |
| Posted on: Aug 6 2012, 11:57 AM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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Well done NASA ! technology at its best! |
| Forum: MSL · Post Preview: #187008 · Replies: 1152 · Views: 962313 |
| Posted on: Dec 6 2011, 03:33 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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Very well presented conference on this new discovery ..Next major step is determining the mass(and hence density) of the planet so as to better characterize it interms of whether it is likely to be rocky type(Earth-like) or more like uranus/neptune type if I understood correctly. I would assume that atmospheric measurements will be possible by spectral analysis in the near future. How do they actually get to measure planetary mass ?? |
| Forum: Telescopic Observations · Post Preview: #181221 · Replies: 1264 · Views: 731478 |
| Posted on: Nov 7 2011, 02:08 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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I am no gelogist...rock types visible in endeavour crater rim would be expected to exhibit some water activity due to the energy involved in crater formation and not necessarily be indicative of a wetter ancient mars history??! |
| Forum: Opportunity · Post Preview: #179934 · Replies: 531 · Views: 334036 |
| Posted on: Oct 7 2011, 04:54 AM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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So where would shoemaker ridge be on this close up map of cape York? |
| Forum: Opportunity · Post Preview: #179065 · Replies: 3597 · Views: 3531676 |
| Posted on: Aug 30 2011, 12:02 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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The white stuff seems to be coating a lot of rocks in this area..it is necessary to know what it is!! |
| Forum: Opportunity · Post Preview: #178118 · Replies: 479 · Views: 336252 |
| Posted on: Aug 10 2011, 05:21 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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I'm curious to see MI images of the new terrain. |
| Forum: Opportunity · Post Preview: #177369 · Replies: 479 · Views: 336252 |
| Posted on: Aug 10 2011, 12:33 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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QUOTE (walfy @ Aug 10 2011, 09:49 AM) Just one more for tonight: [attachment=25211:otherside.jpg] Extraordinary. It's like looking down at a shore of a great lake. Congrats to all the engineers, scientists, rover drivers, everyone who had a hand in this! Impressive view of the central mound! |
| Forum: Opportunity · Post Preview: #177335 · Replies: 479 · Views: 336252 |
| Posted on: Aug 10 2011, 12:21 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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I just wonder what that white streak represents?? |
| Forum: Opportunity · Post Preview: #177332 · Replies: 479 · Views: 336252 |
| Posted on: Aug 10 2011, 12:04 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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QUOTE (Sunspot @ Aug 10 2011, 08:54 AM) Interesting feature...there is a thin line of very bright material in this navcam view, bottom left http://qt.exploratorium.edu/mars/opportuni...G3P0653L0M1.JPG Looking at this bedrock reminds me of sedimentary rock here in my backyard..the way they are stacked makes them remarkably similar to what I see on my sedimentary island in the med.....planet earth and i'm no geologist!! |
| Forum: Opportunity · Post Preview: #177330 · Replies: 479 · Views: 336252 |
| Posted on: Aug 9 2011, 09:25 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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Is there crism data of the central mound and surrounding interior of endeavour?? ADMIN - You asked the same question less than 6 hours ago : http://www.unmannedspaceflight.com/index.p...st&p=177245 - any real need to ask it again so rapidly? What s happening behind the scenes? Any news of Oppy driving towards CY yet? ADMIN - Read this thread. There is plenty of news. |
| Forum: Opportunity · Post Preview: #177272 · Replies: 1559 · Views: 801287 |
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