Were any lunar volcanos ever found?

[willpittenger]

It would be very difficult for an object the size of the Moon not to have had plate techonics at some disant point in its past. However, I figure the impact crater formation has obliterated such evidence. However, by the time the volcanos you mentioned formed, the crust was too thick with a solidifying mantle. <div class="Discussion_UserSignature"> <hr style="margin-top:0.5em;margin-bottom:0.5em" />Will Pittenger<hr style="margin-top:0.5em;margin-bottom:0.5em" />Add this user box to your Wikipedia User Page to show your support for the SDC forums: <div style="margin-left:1em">{{User:Will Pittenger/User Boxes/Space.com Account}}</div> </div>

 

[3488]

Yes. You may be right. Perhaps the extinct volcanoes I have mentioned on the moon, may have formed from magma, generated by the heat from gigantic impacts. <br /><br />I do suspect though, that there may well be evidence of original lunar volcanic activity.<br /><br />It is now thought, that large quantities of liquid water is essential for the 'Subduction Zones' as it makes the rocks more pliable.<br /><br />If this is true, than for the moon, this could never have happened & it may have only been briefly possible on Mars, before the red planet dried out.<br /><br />That is why I think for the Moon & Mars, it was hot spot volcanoes only.<br /><br />Andrew Brown. <div class="Discussion_UserSignature"> <p><font color="#000080">"I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before".</font> <em><strong><font color="#000000">Linda Morabito </font></strong><font color="#800000">on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.</font></em></p><p><font size="1" color="#000080">http://www.launchphotography.com/</font><br /><br /><font size="1" color="#000080">http://anthmartian.googlepages.com/thisislandearth</font></p><p><font size="1" color="#000080">http://web.me.com/meridianijournal</font></p> </div>

 

[willpittenger]

I question the liquid water requirement. I have seen videos of lava pools where the crust forms a crust that breaks up from the currents. The pieces act like plates on the mantle. <div class="Discussion_UserSignature"> <hr style="margin-top:0.5em;margin-bottom:0.5em" />Will Pittenger<hr style="margin-top:0.5em;margin-bottom:0.5em" />Add this user box to your Wikipedia User Page to show your support for the SDC forums: <div style="margin-left:1em">{{User:Will Pittenger/User Boxes/Space.com Account}}</div> </div>

 

[alokmohan]

Any link?

 

[3488]

Post deleted by 3488 <div class="Discussion_UserSignature"> <p><font color="#000080">"I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before".</font> <em><strong><font color="#000000">Linda Morabito </font></strong><font color="#800000">on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.</font></em></p><p><font size="1" color="#000080">http://www.launchphotography.com/</font><br /><br /><font size="1" color="#000080">http://anthmartian.googlepages.com/thisislandearth</font></p><p><font size="1" color="#000080">http://web.me.com/meridianijournal</font></p> </div>

 

[telfrow]

3488:<br /><br />Please see this post from the mods in Suggestions and Announcements concerning URLs and Links. Thanks. <div class="Discussion_UserSignature"> <strong><font color="#3366ff">Made weak by time and fate, but strong in will to strive, to seek, to find and not to yeild.</font> - <font color="#3366ff"><em>Tennyson</em></font></strong> </div>

 

[3488]

Hi there, could not get it to work!! I have tried on several occassions, but it never works, so I seem to have no option bt to post it long hand!!<br /><br />Deleted other post as the links looked just gibberish.<br /><br />Andrew Brown. <div class="Discussion_UserSignature"> <p><font color="#000080">"I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before".</font> <em><strong><font color="#000000">Linda Morabito </font></strong><font color="#800000">on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.</font></em></p><p><font size="1" color="#000080">http://www.launchphotography.com/</font><br /><br /><font size="1" color="#000080">http://anthmartian.googlepages.com/thisislandearth</font></p><p><font size="1" color="#000080">http://web.me.com/meridianijournal</font></p> </div>

 

[alokmohan]

Why deleted 3488?

 

[MeteorWayne]

He couldn't get the link to work right.<br />I PM'd him some suggestions, if he has better luck, I'm sure he'll post it again. <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>

 

[JonClarke]

"It is now thought, that large quantities of liquid water is essential for the 'Subduction Zones' as it makes the rocks more pliable. "<br /><br />Water also acts as a flux and depressed the melting point of rocks faciliating the partial melthinbg of down going slabs. No hydrosphere, no large-scale aqueous alteration, and island arc volcanism suddenly gets a lot harder. A-volcanic subduction might still be possible through.<br /><br />Island arc volcanism may also be facilitated by oxygen-driven weathering of basalt, which produces rocks suspicously similar in bulk composition to andesites. Thin successions of such sediments get subducted and melted and contribute to the growth of felsic and intermediate crust. thicker successions tend to be scraped off, metamorphosed and accreted onto plate margins. <br /><br />Thus plate tectonics as we see it may only be possible not only because Earth has a hydrosphere, but because it has a biosphere as well. All speculation at this stage, but it did make it into Nature a few weeks back, and is very intriguing.<br /><br />Jon <div class="Discussion_UserSignature"> <p><em>Whether we become a multi-planet species with unlimited horizons, or are forever confined to Earth will be decided in the twenty-first century amid the vast plains, rugged canyons and lofty mountains of Mars</em>  Arthur Clarke</p> </div>

 

[3488]

Hi there all,<br /><br />Sorry Alokmohan, I have been having problems with my set up, regarding URLs. I will provide those links once I am sorted.<br /><br />If you want to see what the links were about, check out Erta Ale in Ethiopia & the Danakil volcanoes in East Africa, part of the African Rift Valley, which has a permanent lava lake as well as the one in Hawaii (cannot spell the name, I know about the feature very well, but just cannot spell it).<br /><br />Hi Jon, yes I understood that it was thought that an aquatic environment that was required for SUBDUCTION zones. This is the first that I have heard about the Biosphere having a part too.<br /><br />I would suggest that people read Mercury, The Elusive Planet, by Strom. He describes the ideas being bantered about prior to Mariner 10's hugely successful triple encounters with Mercury, as to what Mariner 10 would image. Ideas ranged from Mercury being as bald as a coot, due to the T Tauri stage of the sun, blasting the origianl surface away, to something that looked a less cratered version of our moon (fewer craters as Mercury was far from the Asteroid Belt, not many Earth, Venus or Mercury crossing asteroids were known back then). <br /><br />One idea was that Mercury has active volcanoes, subdustion zones & spreading ridges, seeing as it was known that Mercury was dense (Iron Core), under a relatively thin mantle & crust.<br /><br />Of course, we now know otherwise & when MESSENGER arrives, of course we will know much more.<br /><br />Andrew Brown. <div class="Discussion_UserSignature"> <p><font color="#000080">"I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before".</font> <em><strong><font color="#000000">Linda Morabito </font></strong><font color="#800000">on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.</font></em></p><p><font size="1" color="#000080">http://www.launchphotography.com/</font><br /><br /><font size="1" color="#000080">http://anthmartian.googlepages.com/thisislandearth</font></p><p><font size="1" color="#000080">http://web.me.com/meridianijournal</font></p> </div>

 

[JonClarke]

The problem with postulating subduction with Venus is twofold. <br /><br />First, the Magellan radar showed none of the features that might be asociated with plate tectonics. Obvious spreading centres, trenches, volcanic arcs, volcainic chains, extensive fold belts (although localised ones are known).<br /><br />The second iis the fact that all 7 surface analyses by Venas 8-14 and Vega 1 & 2 point to basaltic compositions. None of the andesites or granites associated with plate tectonics.<br /><br />Maybe internal heat is lost completely differently on Venus to the Earth. Maybe the basaltic crust is too thick to subduct, as shown on Earth by the Ontong Java Plateau in the SW pacific which has choked a subduction zone. Maybe the basalt is just a veneer, and beneath it is more bouyant granitic crust buried in the resurfacing event.<br /><br />Jon <div class="Discussion_UserSignature"> <p><em>Whether we become a multi-planet species with unlimited horizons, or are forever confined to Earth will be decided in the twenty-first century amid the vast plains, rugged canyons and lofty mountains of Mars</em>  Arthur Clarke</p> </div>

 

[alokmohan]

In short we are not sure if there is plate tectonic in mercury,venus,moon .Messeger data may help.Eagerly we wait data from MESSENGER.

 

[willpittenger]

When is it supposed to be ready to send back data? <div class="Discussion_UserSignature"> <hr style="margin-top:0.5em;margin-bottom:0.5em" />Will Pittenger<hr style="margin-top:0.5em;margin-bottom:0.5em" />Add this user box to your Wikipedia User Page to show your support for the SDC forums: <div style="margin-left:1em">{{User:Will Pittenger/User Boxes/Space.com Account}}</div> </div>

 

[alokmohan]

http://messenger.jhuapl.edu/whereis/index.php

 

[3488]

Good link Alokmohan. Not much to report just now on MESSENGER.<br /><br />I hope MESSENGER shows lots of evidence of Mercurian volcanology. Mariner 10 certainly showed some cones!!<br /><br />It seems as though Venus builds up internal heat, perhaps releasing some through hot spot volcanism in episodes (IMO).<br /><br />But the real heat escape appears to be regular resurfacing of the entire planet. Don Mitchell's images do indeed show youthful landscapes, particularly Venera 14's images. <br /><br />Andrew Brown. <div class="Discussion_UserSignature"> <p><font color="#000080">"I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before".</font> <em><strong><font color="#000000">Linda Morabito </font></strong><font color="#800000">on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.</font></em></p><p><font size="1" color="#000080">http://www.launchphotography.com/</font><br /><br /><font size="1" color="#000080">http://anthmartian.googlepages.com/thisislandearth</font></p><p><font size="1" color="#000080">http://web.me.com/meridianijournal</font></p> </div>

 

[alokmohan]

Is it due to plate tectonis,my old question.

 

[3488]

Hi Alokhohan,<br /><br />Venus has no known plate tectonics. I have literally gone through 'hundreds' of Magellan images myself & cannot find proof of ANY plate tectonics on Venus (there are no suduction zones or the equivalent of spreading ridges). <br /><br />It is hot spot volcanism & Venus seems to rid excessive internal heat by repeated re-surfacing events, & well as isolated hot spot volcanoes.<br /><br />The Maxwell Montes area is the closest to anything I can find (almost certainly these are compressional mountains, but can be explained by undergound movements of magma, deforming the crust above, rather than the Cytherean equivalent of the Himalayas).<br /><br />The moon, MAY have had some form of plate tectonics in its youth, but all signs of it has been wiped out by subsequent impacting events.<br /><br />Andrew Brown. <div class="Discussion_UserSignature"> <p><font color="#000080">"I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before".</font> <em><strong><font color="#000000">Linda Morabito </font></strong><font color="#800000">on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.</font></em></p><p><font size="1" color="#000080">http://www.launchphotography.com/</font><br /><br /><font size="1" color="#000080">http://anthmartian.googlepages.com/thisislandearth</font></p><p><font size="1" color="#000080">http://web.me.com/meridianijournal</font></p> </div>

 

[alokmohan]

Thanks 3488.We can not stay in moon.Without plate tectonics is may be dead.

 

[JonClarke]

Andrew, I don't think the Moon could ever had plate tectonics in the terrestrial sense, when when it was largely molten. the lunar crust is made up of anorthosite, which is largely of plagioclase. This would float on a magma ocean in much the same way as ice floats on water. The primordial lunar crust was simply too bouyant to be subducted. Also remember that the bulk of the lunar crust was formed by 4.5 Ga as well, as far as I recall.<br /><br />Jon <div class="Discussion_UserSignature"> <p><em>Whether we become a multi-planet species with unlimited horizons, or are forever confined to Earth will be decided in the twenty-first century amid the vast plains, rugged canyons and lofty mountains of Mars</em>  Arthur Clarke</p> </div>