Difference between revisions of "June 1, 2004"

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=Posidonius: Rilles and Uplift=
 
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<div align="center"><IMG SRC="../01/images/LPOD-2004-01-09.jpeg" NAME="Pic1But" width="393" height="399" border="0">
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<div align="center">[[File:LPOD-2004-01-09.jpeg|LPOD-2004-01-09.jpeg]]
 
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<p class="main_sm" align="center">Image Credit: [mailto:jphillip@bcpl.net Jim Phillips]</p>
 
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<td><p class="Story" align="center"><b>Posidonius: Rilles and Uplift</b></p>
 
<td><p class="Story" align="center"><b>Posidonius: Rilles and Uplift</b></p>
<p class="story" align="left">Posidonius is a beacon of interest along the otherwise bland north-eastern shore of Serenitatis. The large (95 km wide, 2.3 km max depth crater may have originally looked like Copernicus with broad terraced walls and a scattering of peaks centered on a deep, flat floor. But thats not how it looks now! As this excellent photo by Jim Phillips shows the inner walls are narrow ridges (at least on the mare side), the floor is shallow, wide and covered with arcuate mountains, hills and rilles. How did the transformation take place? Like ["../../../LPOD-2004-01-07.htm" Petavius], Posidonius is a floor-fractured crater. Rising magma ponded under Posidonius, uplifting and fracturing its floor. Lava also leaked out and partially filled the crater and created the sinuous rille. The small semi-circle of peaks near the center may be the tops of a lava-large buried central peak complex. The arcuate mountains near the east and west walls are more mysterious - are they uplifted floor or isolated portions of terraces? Take a look!</p>
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<p class="story" align="left">Posidonius is a beacon of interest along the otherwise bland north-eastern shore of Serenitatis. The large (95 km wide, 2.3 km max depth crater may have originally looked like Copernicus with broad terraced walls and a scattering of peaks centered on a deep, flat floor. But thats not how it looks now! As this excellent photo by Jim Phillips shows the inner walls are narrow ridges (at least on the mare side), the floor is shallow, wide and covered with arcuate mountains, hills and rilles. How did the transformation take place? Like [[January_7,_2004|Petavius]], Posidonius is a floor-fractured crater. Rising magma ponded under Posidonius, uplifting and fracturing its floor. Lava also leaked out and partially filled the crater and created the sinuous rille. The small semi-circle of peaks near the center may be the tops of a lava-large buried central peak complex. The arcuate mountains near the east and west walls are more mysterious - are they uplifted floor or isolated portions of terraces? Take a look!</p>
 
<p class="story" align="left"><span class="class"><i>Originally posted January 9, 2004 </i></span></p>
 
<p class="story" align="left"><span class="class"><i>Originally posted January 9, 2004 </i></span></p>
 
<p class="story" align="left"><b>Related Links:</b><br>
 
<p class="story" align="left"><b>Related Links:</b><br>
 
[http://www.apolloexplorer.co.uk/photo/html/as15/10075722.htm Posidonius from Apollo 15]
 
[http://www.apolloexplorer.co.uk/photo/html/as15/10075722.htm Posidonius from Apollo 15]
 
</p>
 
</p>
<p class="story"><b>Tomorrow's LPOD:</b> Gassendi</p>
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<p><b>Yesterday's LPOD:</b> [[May 31, 2004|Ten Day Old Moon]] </p>
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<p><b>Tomorrow's LPOD:</b> [[June 2, 2004|Gassendi]] </p>
 
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<p align="center" class="main_titles"><b>Author & Editor:</b><br>
 
<p align="center" class="main_titles"><b>Author & Editor:</b><br>
 
[mailto:tychocrater@yahoo.com Charles A. Wood]</p>
 
[mailto:tychocrater@yahoo.com Charles A. Wood]</p>
<p align="center" class="main_titles"><b>Technical Consultant:</b><br>
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[mailto:anthony@perseus.gr Anthony Ayiomamitis]</p>
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<p align="center" class="main_titles"><b>A service of:</b><br>
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[http://www.observingthesky.org/ ObservingTheSky.Org]</p>
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<p align="center" class="main_titles"><b>Visit these other PODs:</b> <br>
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[http://antwrp.gsfc.nasa.gov/apod/astropix.html Astronomy] | [http://www.msss.com/ Mars] | [http://epod.usra.edu/ Earth]</p>
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<p>&nbsp;</p>
 
<p>&nbsp;</p>
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===COMMENTS?===
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Latest revision as of 11:22, 6 June 2015

Posidonius: Rilles and Uplift

LPOD-2004-01-09.jpeg

Image Credit: Jim Phillips

Posidonius: Rilles and Uplift

Posidonius is a beacon of interest along the otherwise bland north-eastern shore of Serenitatis. The large (95 km wide, 2.3 km max depth crater may have originally looked like Copernicus with broad terraced walls and a scattering of peaks centered on a deep, flat floor. But thats not how it looks now! As this excellent photo by Jim Phillips shows the inner walls are narrow ridges (at least on the mare side), the floor is shallow, wide and covered with arcuate mountains, hills and rilles. How did the transformation take place? Like Petavius, Posidonius is a floor-fractured crater. Rising magma ponded under Posidonius, uplifting and fracturing its floor. Lava also leaked out and partially filled the crater and created the sinuous rille. The small semi-circle of peaks near the center may be the tops of a lava-large buried central peak complex. The arcuate mountains near the east and west walls are more mysterious - are they uplifted floor or isolated portions of terraces? Take a look!

Originally posted January 9, 2004

Related Links:
Posidonius from Apollo 15

Yesterday's LPOD: Ten Day Old Moon

Tomorrow's LPOD: Gassendi


Author & Editor:
Charles A. Wood

 


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