Difference between revisions of "May 4, 2014"
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<em>Plots from [http://www.hou.usra.edu/meetings/lpsc2014/pdf/2679.pdf Andrews-Hanna and colleagues, LPSC]</em><br /> | <em>Plots from [http://www.hou.usra.edu/meetings/lpsc2014/pdf/2679.pdf Andrews-Hanna and colleagues, LPSC]</em><br /> | ||
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| − | These three color data images are centered on the [http://lpod. | + | These three color data images are centered on the [http://www2.lpod.org/wiki/February_19,_2007 PKT], the Procellarum KREEP Terrane, the most radioactive-rich region of the Moon and the region where most lunar maria occur. Jeffrey Andrews-Hanna and colleagues include these maps in their abstract from the recent Lunar and Planetary Science Conference. Map <em>a</em> shows gravity gradients (with blue areas where the gravity value most rapidly changes. Imbrium is the near-center light blue circle, and Serenitatis, Crisium and Nectaris are deeper blue circles to the right. This map includes a number of [http://www2.lpod.org/wiki/December_8,_2012 lunar worms] that outline the PKT. They can be better seen in plots <em>b</em> and <em>c</em> as black lines segments. Chart <em>b</em> shows topography with blues being low, and chart <em>c</em> displays thorium, which is the main geochemical marker for the PKT. Andrews-Hanna and colleagues propose that these dark lines are lava-filled crustal fractures that fed magma from the mantle to form many of the nearside maria. The rectangular distribution of these lines/fractures is nearly the same as the surface structures Ewen Whitaker long ago used to defined the the giant [http://adsabs.harvard.edu/abs/1981mrbf.conf..105W Procellarum impact basin], but the Andrews-Hanna team proposes that that basin doesn't exist. I wish I had been at their LPSC presentation for I am not convinced that the dark lines are not a deep manifestation of the Procellarum Basin, rather than fractures due to thermal expansion and contraction of lunar crust and mantle. The dark lines - the worms - are real, their interpretation may yet evolve.<br /> |
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<em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | <em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | ||
Latest revision as of 08:33, 28 October 2018
PKT Worms
Plots from Andrews-Hanna and colleagues, LPSC
These three color data images are centered on the PKT, the Procellarum KREEP Terrane, the most radioactive-rich region of the Moon and the region where most lunar maria occur. Jeffrey Andrews-Hanna and colleagues include these maps in their abstract from the recent Lunar and Planetary Science Conference. Map a shows gravity gradients (with blue areas where the gravity value most rapidly changes. Imbrium is the near-center light blue circle, and Serenitatis, Crisium and Nectaris are deeper blue circles to the right. This map includes a number of lunar worms that outline the PKT. They can be better seen in plots b and c as black lines segments. Chart b shows topography with blues being low, and chart c displays thorium, which is the main geochemical marker for the PKT. Andrews-Hanna and colleagues propose that these dark lines are lava-filled crustal fractures that fed magma from the mantle to form many of the nearside maria. The rectangular distribution of these lines/fractures is nearly the same as the surface structures Ewen Whitaker long ago used to defined the the giant Procellarum impact basin, but the Andrews-Hanna team proposes that that basin doesn't exist. I wish I had been at their LPSC presentation for I am not convinced that the dark lines are not a deep manifestation of the Procellarum Basin, rather than fractures due to thermal expansion and contraction of lunar crust and mantle. The dark lines - the worms - are real, their interpretation may yet evolve.
Chuck Wood
Yesterday's LPOD: A Big Cluster
Tomorrow's LPOD: The Truth
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