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Hale Distal deposits give clues to late water and geomorphic activity on Mars

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Transcript of Hale Distal deposits give clues to late water and geomorphic activity on Mars

A possible Hale Distal deposit in the SW region.
Location: 337E., -41.4N
Background
What is the Hale Impact Crater?
Why Hale ?
Young crater.
One of the best preserved large craters on Mars.
Hale impact post­dated late alluvial fan activity observed across
much of southern Margaritifer Terra (Grant and Wilson., 2011, 2012).
Meaning the crater could give clues to
late water/geomorphic activity on Mars.


Where?
35.70S, 323.60E
Northern rim of Argyre basin in Argyre region of Mars.


When?
formed in the Early to Middle
Amazonian.
(Jones et al., 2011).
Age translates to about 2-3 billion years old.

How far reaching were effects of Hale impact?
Recent work by Schultz and Wrobel (2012) concludes Hale-related effects were far reaching.
Geomorpholgy of SE and SW
Asymmetrical Ejecta Extending to NE & SW(Schultz and Wrobel, 2012).
Channels and fluidized debris flows around Hale formed by water from the melting of subsurface ice during impact (Jones et al., 2011; El-Maarry, et al., 2013).

“…secondary flow of ejecta mixed with water–ice-rich basin materials.” (El-Maarry, et al., 2013).
Fluidized flows generally follow pre-existing topography, including valleys.
Are there fluidized flows further beyond those previously mapped???
What are Hale Distal Deposits?
Distal Deposits (mud like material) up to 675 km from Hale, generally morphologically similar to proximal deposits (He1 unit)
Occur as channels and lobes typically smoother/darker than adjacent surfaces
Correlate to wind streaks oriented radial to Hale (Schultz and Wrobel, 2012)
Occur near secondary clusters and on distal (down-wind) side of craters
Fill low-lying areas and embay hale secondary craters

Center for Earth and Planetary Studies (CEPS)
Hiruni Senarath Dassanayake
Summer 2016

Hale Distal deposits give clues to late water and geomorphic activity on Mars.
The Hale Impact Crater is a
125 X 150 km oblong crater
Formed by an impact at 10-15 degrees (Schultz and Wrobel 2012).
The map of Hale deposits in the NE and NW (Grant and Wilson., 2016)
Hypothesis:
What is the geomorphology of the
SW and SE region of Hale?
What is the nature of the distal deposit in the study area?
YES!!!!!!
Buzz Aldrin
Why are Hale deposits important?
*It gives clues to late water/geomorphic activity that occurred before Martian water froze for a long ago.

*Distal deposits shows how Hale impact significantly influence short term global or regional scale geomorphic activity.
(Grant and Wilson, 2016).
Figure 8 Grant and Wilson (2016)
What do Hale deposits look like?
Method
Used existing literature to understand the study area.
The geomorpholgy of the chosen region was analyzed using CTX and THEMIS nighttime infrared images.
Distal deposits were identified using the Java mission software (JMARS) and Google Earth.
Conclusion
This study established that mud like deposits gives clues to late water/geomorphic activity on Mars before the planet froze for a very long time.
This is an ongoing project and further research needs to be done to confirm that the Hale distal deposits significantly influenced short term global or regional scale geomorphic activity on Mars.
Preliminary Results
Ice rich surface surround Hale (SW and SE)
Knobby terrain on the SW of Hale
Similarities to previously mapped region (NE & NW)
Appx 614 Km of Hale.
typically smoother/darker than adjacent surface.
Occur near secondary crater clusters.
Fill low-lying areas and embay hale secondary craters.

Difference
The distal deposit does not Correlate to wind streaks oriented radial to Hale as wind streaks cannot be seen in SW.
The deposit does not appear to have flowed on the surface of Mars.
Nature of the distal deposits
Geomorpholgy of the study area at a glance
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