Spiders_ and_Fans - Page 3

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Dana Author Profile Page



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Reply: 41



PostPosted: July 3, 2009 7:49 AM 

Some of the vents appear to have a small crater depression in the distant history, in my cataloging of the varied vent types, and finding a natural series or single set of causes for all morphology alterations of the vent holes, dark streaking fan domains, and the 'spider' channeling, as well as the mounds and the 'towers', is a challenge to my mind.
Catalyzing events or 'triggering' mechanisms, and explanations for the volumes of altered ground exposure growths and erosion types are a varied set of apparant patterns. Certainly the actions are resulting in differing appearances, patterned within the variations, but each a unique signature in details.

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To compare a simple example of lunar activity to this distinctly Martian process of venting as seasonal activity, here is a first image of the new LRO/LROC mission satellite in orbit around the Earth's Moon. This is a 100% full size and resolution section of the large 128MB lunar grey scale calibration image, nacl000000fd . This section shows a mound in grey, elevated at the margins, centered by a explosive core crater, with well preserved rim, and set within a older, larger crater with softened rim, and the textural mound is distinct as a ground mass, differing from the erosion textures of the setting environment.
The mound is located at the lower right of center in this section, margined on the left and upper side, by chains of pits in linear formation, related to each other as a geometric display. The setting of this scene is a triangle of three or four deep craters of similar size, shadowed, and bottoms not viewable in the dark shade tones. I can see a recent eruptive material source at the mound, deeper pit chains of missing linear fault/fractures depressions or cavernous openings, with the setting as an older terrain than the mounded eruptive process. Other than volatiles, what is eruptive and preservational in active geology on the Earth's Moon?
Can we guess at a first sighting of a venting of volatiles on the Moon here? Only a estimation basedf upon simple information as yet, but this new mission is going to alter our view of the Moon and it's Natural History.
Can this event scene be compared to the Chryse region events, or the polar Mars fans and spider source materials and events?
On Mars the events seem to have a perrenial, or a repeated annual active history. On the Moon, this image from the LROC Gallery, seems to give the impression of a singular geological process, but multiple events stimulating the singular responsiveness of the lunar subsurface over long lengths of timing.

I am relying on my own interpretations of this scene on the Moon,and you and others may want to criticize or challenge the information.

Image nacl000000fd .
Location, x=1400 , y=42525 .
A first calibration image at the LROC Browse Gallery.
http://wms.lroc.asu.edu/lroc_browse
Second image, bottom of the first page. Links to a 128MB Tif image source. Section shown altered slightly. Several alternative images are at my image host, in sequence, from the x,y, location.

The source Tiff image will be presented on a topic of this new mission and a cataloging of the lunar imaging from the site, in the Space Exploration section of this blog, if you are interested in concentrating on lunar imaging as well as Mars.
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I'll be looking at your images above, in reply #40. My computer has been blocked by some process from downloading HiRISE source images temporarily. I will fix that and return shortly.

Are we looking at a class of events on two planetary bodies, or, two types of eruptive events with two source materials?

MPJ


Posts: 250

Reply: 42



PostPosted: July 4, 2009 2:44 PM 

Sure, the LRO will provide alot of interesting new features like the MRO allthough, if i remember right its camera system has a little less max resolution. Maybe i have a look on the moon after the summer as well Smile

Dana Author Profile Page



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Reply: 43



PostPosted: July 4, 2009 6:05 PM 

Makes me consider the value of lunar autonomous rovers as a possible 'inexpensive method of testing the terrain abilities and space hardening characteristics of new equipment designs. A close by operating rover would be fairly responsive to human intervention, and there may be shown in these current Moon mapping satellite missions of several countries, a few very valuable target features, such as possible ice pits , or buried ice/debris layers near a relatively flat, traversable surface. The problem will be to find geology suitable for new rover wheels or 'legs', in sunlit areas. I suppose it's too much to expect to find an ice source near the surface which could be approached by a small rover design. The extended extremes of the lunar terrain climate will be a real challenge as well. Designing a dust/regolith thickness measurement-detection system that could operate on a rover might be a good use of lunar rovers. Penetrating and measuring the dune/layers to a supportive surface might not be accomplished in our lifetimes, but it would be necessary in most landings anywhere.
I imagine the round mound feature I show at reply #41 will be too shaded and too rough a surface for a later rover to study. If ice were to be present on the Moon, it would likely be found hidden in these deeper chasms or post eruptive pits, I would image. The problem, is the lack of sunlight for a renewable power source allowing the rover lifetime in the multi-year length to test for improved battery survivability. Deep thermal swings of the lunar exposure would probably equal any in the solar system, if targets could be found for survey rover missions.
That first image drops out at the shaded areas, and has not much information in the dark tones.
Ref., your mention of resolution, I remember a bast figure of 1.4 meters/pixel for the LROC system, and will test it for greater ability along the way. These polar vents on Mars would be not seen directly by the system. I may not find the actual water ice it seeks in buried sources.
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I am including the initial Wikipedia Martian 'Spiders' topic publication on this topic listing, as it has some good links, and a wide ranging basic description, fitting my observations thus far. Several competing processes are mentioned, and the closeups are too fresh to give final rejection of various alternative process additions to the simple CO2 sublimation layered described best estimate.

I am still trying to remove the offending block on downloading HiRISE image files. I am also moving items into storage here, to clear some space, and to allow for some construction activity here. Hope to be posting images before next week again.


http://en.wikipedia.org/wiki/Martian_spiders

True polar wander should have left a terrain of altered former venting, if the sources are related to simple environmental temperature swings and direct radiative conversion.

Dana Author Profile Page



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Reply: 44



PostPosted: September 29, 2009 9:57 AM 

To return this topic to the stated 'Spiders and Fans' subject and the venting causing the dark and bright streaking on Mars, here are a few closeups of a series of vents in the HiRISE image ESP_014174_0865.
These are first at 4x of full HiRISE image size, and the last are at 2x of full size.
The vent string are reasonably aligned, and many are present in the original image. I'll be presenting some examples of spider formations from this original during this week. This is an area for viewing the details of venting in an inactive state in the image.
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A view of the scene in a full spectrum and full tonal range. The vents are near the ground level, indicating that these are not a surface ice layer venting. That is common for the vents, and the source of dark fan activity.
In this image substantial erosion has occurred at the vent troughs, and material has been transported downhill in a gravity controlled path.
Other images will be presented soon.
ESP_014174_0865
Located at -86.3 Latitude, 247 Longitude.
Image taken August 2009, northern winter, with the sun just 14* above the northern horizon. Scale is at 50cm/pixel.
This image is taken along the stepped layers of the southern ice margin at the cap edge.

Dana Author Profile Page



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Reply: 45



PostPosted: September 29, 2009 10:05 AM 

To the many repeats of the shadow views of the vents, here are a few views of the full tonal range at this and additional examples.
First the current vent series in full 2 to 1 view.
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x=29900 , y=13380 . Source color JP2 rotated -23.1*.

Dana Author Profile Page



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Reply: 46



PostPosted: September 29, 2009 10:23 AM 

You may notice that these former active vents are present along a fracture/fault line, and the many dark zones/streaks of Mars which are isolated and referred to as 'basaltic sand' assemblies are also near fracture fault lines similarly. Many of the dark streaking at scarps and slopes are also associated with faults and fracture features. Not to claim that all are the same. My contention is that Mars exhibits a dark streaking at many locations and climate zones, with similar actions underway in a substantial percentage of the occurrences.

Dana Author Profile Page



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Reply: 47



PostPosted: September 29, 2009 3:42 PM 

A few additional versions of the polar vent series in ESP_014174_0865. These are very accurate to the original in the basics, simply a varied use of the filtered spectrum assembly used in the color HiRISE image, giving detail in the darker aspects of the pits and vent structures.
Hope this is informational.
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Same objects as entry #47.
Image originals courtesy of the HiRISE site catalog at the University of Arizona.
Processed in IAS viewer and XNView.

Dana Author Profile Page



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Reply: 48



PostPosted: September 30, 2009 7:40 AM 

The darkest tone is converted to white in these alterations of the same location.
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A possible gravity path for a dense gas or a liquid appears to be existent in the darkest tone path, and it connects to the darker areas of the image, leading down-slope.

Dana Author Profile Page



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Reply: 49



PostPosted: September 30, 2009 7:47 AM 

Another location, where a spider formation has a common 'tail' of pits and mounds, some of which are showing pairs or greater number of large spheroidal structures with the darkest black or shaded near black shadows.
The spider shows the classic 'M' front 'arm' extension as well.
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The association of massive spheroids and possible vent locations is clear in this location. The association of spiders and large spheroids is also clear.

Dana Author Profile Page



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Reply: 50



PostPosted: September 30, 2009 7:58 AM 

This location in the same ESP_014174_0865 HiRISE image shows a 'starfish' shape, with stubby 'arm' extensions, and dark spots at the 'arms'.
The possibility might be that the shape was actively venting at some prior time, although there is no evidence in the current view to show that association.
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The layered polar deposits are jointed and fractured by a crystalline process in this view, and the smaller units are spotted by a single darker spot on each section.
ESP_014174_0865. X=35550 , y=6150 .

The details you are viewing are very dark shaded to near black areas in the full tonal range original JP2 file.

Dana Author Profile Page



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Reply: 51



PostPosted: September 30, 2009 8:08 AM 

A few images of the classic 'M' front 'arm' extension in the spider assemblies. Other interesting items such as patterned 'jaw bone' type shapes with regular dark recessed spots are seen in some.
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In some of these images the removal and transport of solids down-slope can be viewed as shallow gully-like structures on the polar layered deposit steppes.
ESP_014174_0865

Dana Author Profile Page



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Reply: 52



PostPosted: September 30, 2009 8:16 AM 

A few remaining selections for this original HiRISE/MRO source image.
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There may be few additional images from this source file before I move to another HiRISE example source image.

Dana Author Profile Page



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Reply: 53



PostPosted: September 30, 2009 3:44 PM 

An example on Mars of Northern Polar defrosting ice layers which show similar fracture/faulting, or, here referred to as 'polygon' patterns, in ice, of a basaltic base or dune particulate mix with ice(s), and the estimation is of a ice /soil freeze=thaw cyclic construction of 'polygons'. The pattern is very close to basaltic near 90 degree angularity, and a combined effect is probably indicated. There may be additional influence of active alterations based upon transient liquids or other active processes.
Looking at the image right to left or reversing that orientation, gives a number of East or West oriented defrosting preference corners, causing a possible analogue to the circular dark central spots in Southern Polar Spider formations. My suggestion is simple observation speculation, and may be wrong or inadequate.
The index page of the HiRISE image in this post.
The Spiders seem less than restrictive in formation details. Variation is the rule.

Dana Author Profile Page



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Reply: 54



PostPosted: September 30, 2009 3:54 PM 

A view of Earth based basaltic mass flow material. The spheroidal shapes are all merged or clumped. &imgrefurl=http://www.flickr.com/photos/7730590%40N08/2706436861/&h=500&w=375&sz=195&tbnid=HDOgVy5vZfT2_M:&tbnh=130&tbnw=98&prev=/images%3Fq%3Dpillow%2Bbasalt%2Bimages&hl=en&usg=__EEWfIcVkZQhJxAw6qG9jOp3dTJc=&ei=sZLDSt7PLIrmlAentLjuBA&sa=X&oi=image_result&resnum=1&ct=image
A variety of columnar jointing in basalt in Iceland.
Separated spheroidal basalt from underwater eruption activity. Influence of liquids, and salts and active chemistry.

Dana Author Profile Page



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Reply: 55



PostPosted: September 30, 2009 3:58 PM 

n attempt tp fix the Flickr link, in the prior post, first link.

MPJ


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Reply: 56



PostPosted: October 5, 2009 4:16 PM 

I just watched an old documentary about Voyager 2 Neptune/Triton flyby and been amazed about the Triton geysers again. Suprisingly i immidiatly thought about the Mars polar processes Smile

this is the last part of that documentation with explanation about Triton geysers. They suggest almost the same process like on Mars with the only exception the venting gas on Triton is ice-liquid nitrogen instead of CO2:
http://www.youtube.com/watch?v=PgyME8QT3ew
Maybe there are spider like structures on Triton as well if we could image it at higher resolutions...

Dana Author Profile Page



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Reply: 57



PostPosted: October 29, 2009 1:39 PM 

The HiRISE source JP2 image of recent release, shows an aspect view of s classic 'Spider-Fan' formation, with repeats in a large scale display of the Spider morphology embedded in the layered steppes of the south polar region of Mars.
The very obvious crystalline repeated source of the Spider/dark Fan formations, also shows a mineral core source of the shaping as a possibility, however the mix of materials, or the possibility that this shape is a co-incidence is possible as well.
Certainly the assembly id not co-incidence, and the repeats assures the reliability of the basic information evident in the closely cropped image I present here.
The first image is a animated GIF of the scene. The colors are saturated and the contrast is exaggerated. The marked areas show the mineral crystalline corollary shape at the Spider core.
The upper Spider is fairly fully displayed and the erosion or alterations are well developed.
The lower Spider on the left, is less obvious, and less developed in erosion of the surface terrain stepped or layered ice and mineral ground mass. The far upper right corner shows an additional 'step offset' repeat of the Spider formations, mostly outside the image frame.
The smaller details are repeated in the two primary Spiders marked by white boxes.

The second image is a animated GIF slightly larger in file size, from the same source cropped image section. In the second, I have marked the linear obvious pattern which is a recurrent theme in the Southern Mars polar ice layered upper and lower units all around the pole. Much of the 'Swiss cheese' and the 'Lace terrain' boundaries of the polar ice cap material displays the same fairly defined and rigid crystalline structure. The North polar region is also affected by this well defined pattern.
Spider formations are probable wherever the similar materials are formed in association with the required accompanying conditions. I haven't made a statement about the cause or full content of the formations. I am making basic observations about the ice layered terrain and Spider-Fan association, with this patterned ground.

The third image is a copy of the same section, in a simple still image for reference.
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These are important concept images with a partial solution to the Spider formations, and I am interested in any observations from others who read and agree or disagree with these details. On the associated images at ImageShack.us in my image index listing, the south polar ice 'Swiss cheese' formations in the same index page which I have uploaded also show the same well defined formations in stepped repeat and large scale pattern repetition. I make that point to insure that the concepts are understood as a dominating force in the Martian polar ices. The circular and 'kidney bean' shapes are related to the 'coiled rope' margin patterns, and the assembled collection are pattern aspects of the polar region generally. These all relate to the formation of Spiders and Fans.

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