Eberswalde Crater - Revision history

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2021-08-23T13:04:55Z

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2021-08-23T12:59:36Z

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2021-08-23T12:41:23Z

Michel Lamontagne at 04:30, 20 August 2021

2021-08-20T04:30:40Z

Suitupandshowup: /* Eberswalde Delta */

2021-08-19T20:28:06Z

Eberswalde Delta

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2021-08-19T19:20:03Z

Eberswalde Delta

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2021-08-19T19:17:00Z

Importance

← Older revision		Revision as of 22:29, 2 September 2021
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	* [https://www.youtube.com/watch?v=QWcdAvFN_q0 James Wray - The Search for Water and Life on Mars (and Beyond) (November 15, 2018)]		* [https://www.youtube.com/watch?v=QWcdAvFN_q0 James Wray - The Search for Water and Life on Mars (and Beyond) (November 15, 2018)]
	*[https://www.youtube.com/watch?v=EJk0hS4_gz4 Water on Mars and the Potential for Martian Life]		*[https://www.youtube.com/watch?v=EJk0hS4_gz4 Water on Mars and the Potential for Martian Life]
		+
		+	* [https://www.youtube.com/watch?v=NiT02piO40c The Geological History of Water on Mars and Astrobiological Implications (Vic Baker)]

← Older revision		Revision as of 19:21, 23 August 2021
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	* [https://www.youtube.com/watch?v=DGBbke1wJRk] Lakes on Mars - Nathalie Cabrol (SETI Talks)]		* [https://www.youtube.com/watch?v=DGBbke1wJRk] Lakes on Mars - Nathalie Cabrol (SETI Talks)]
	* [https://www.youtube.com/watch?v=QWcdAvFN_q0 James Wray - The Search for Water and Life on Mars (and Beyond) (November 15, 2018)]		* [https://www.youtube.com/watch?v=QWcdAvFN_q0 James Wray - The Search for Water and Life on Mars (and Beyond) (November 15, 2018)]
		+	*[https://www.youtube.com/watch?v=EJk0hS4_gz4 Water on Mars and the Potential for Martian Life]

← Older revision		Revision as of 16:19, 23 August 2021
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	* [Pondrelli, M. 2008. Evolution and depositional environments of the Eberswalde fan delta, Mars. Icarus. volume=197.]		* [Pondrelli, M. 2008. Evolution and depositional environments of the Eberswalde fan delta, Mars. Icarus. volume=197.]

−	* [https://www.youtube.com/watch?v=DGBbke1wJRk] Lakes on Mars - Nathalie Cabrol (SETI Talks)	+	* [https://www.youtube.com/watch?v=DGBbke1wJRk] Lakes on Mars - Nathalie Cabrol (SETI Talks)]
		+	* [https://www.youtube.com/watch?v=QWcdAvFN_q0 James Wray - The Search for Water and Life on Mars (and Beyond) (November 15, 2018)]

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 *[[Lakes on Mars]]
 *[[Margaritifer Sinus quadrangle]]
 ==References==

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 *[[Jezero Crater]]
 *[[Lakes on Mars]]
 ==References==

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 ==See also==
 *[[Holden Crater]]
 *[[Jezero Crater]]
-* [[Lakes on Mars]]
+*[[Lakes on Mars]]
 ==References==

← Older revision		Revision as of 04:30, 20 August 2021
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		+	{{Mars atlas}}
	==Location and name==		==Location and name==

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 Of major interest to scientists is a river delta in the crater.  Deltas form when water flows into a quiet body of water; hence, it is believed that Eberswalde once contained a large lake.    A  series of valleys leads up into the delta.  Water may have come from an area (drainage basin)  that was  approximately 4000 square km.  The delta itself has a surface area of  115 square km,  and is 13 km by 11km. It was discovered by  [[Mars Global Surveyor]] in 2003.   It has six lobes each about 100 meters thick.<ref>Lewis, K. and O. Aharonson.  2008.  Geomorphic Aspects of the Eberswalde Delta and Potential MSL Traverses</ref>
-So in summary, it is thought that channels first picked up sediments from the surrounding land. They carried them along until they reached the quiet waters of the lake in the crater.  The movement of the water slowed down when the water spread out in the lake.  When this happens, water cannot continue to hold sediments and drops them.  Eventually over time a delta develops.  In the case of Eberswalde, the delta did not form at once but in a series of steps.  The sediments were harden by cementing minerals.  Later, some of the softer or less cemented material was eroded away.  Thus, today we see much detail in the delta.  Only the harder parts are visible.<ref>http://www.msss.com/mars_images/moc/2005/09/20/eberswalde</ref> <ref>Malin, M. and K. Edgett.  2003.  Evidence for persistent flow and aqueous sedimentation on Mars.   Science.  302.  Volume 302.  pages=1931–1934</ref>  Some layers of the delta contain clay.  Finding clay is significant because it forms in water with a pH close to neutral.  This type of environment would support life, and clay can form well-preserved fossils.
+So in summary, it is thought that channels first picked up sediments from the surrounding land. They carried them along until they reached the quiet waters of the lake in the crater.  The movement of the water slowed down when the water spread out in the lake.  When this happens, water cannot continue to hold sediments and drops them.  Eventually over time a delta develops.  In the case of Eberswalde, the delta did not form at once but in a series of steps.  The sediments were harden by cementing minerals.  Later, some of the softer or less cemented material was eroded away.  Thus, today we see much detail in the delta.  Only the harder parts are visible.<ref>http://www.msss.com/mars_images/moc/2005/09/20/eberswalde</ref> <ref>Malin, M. and K. Edgett.  2003.  Evidence for persistent flow and aqueous sedimentation on Mars.   Science.  302.  Volume 302.  pages=1931–1934</ref>  Some layers of the delta contain clay.
 Many craters once contained lakes.<ref>Cabrol, N. and E. Grin. 2001. The Evolution of Lacustrine Environments on Mars: Is Mars Only Hydrologically Dormant? Icarus: 149, 291-328.</ref> <ref>Fassett, C. and J. Head. 2008. Open-basin lakes on Mars: Distribution and implications for Noachian surface and subsurface hydrology. Icarus: 198, 37-56.</ref> <ref>Fassett, C. and J. Head. 2008. Open-basin lakes on Mars: Implications of valley network lakes for the nature of Noachian hydrology.</ref>

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 Eberswalde was suggested as a landing site for both the Curiosity Rover (actually sent to Gale Crater) and for the Perseverance Rover (was sent to Jezero Crater).  Eberswalde did not make the cut, but it will probably be considered for further exploration in the future.<ref> https://marsoweb.nas.nasa.gov/landingsites/msl/workshops/1st_workshop/abstracts/Schieber_1st_MSL_workshop.pdf</ref> <ref> https://marsoweb.nas.nasa.gov/landingsites/msl/workshops/1st_workshop/abstracts/Schieber_1st_MSL_workshop.pdf</ref> <ref> Hand, Eric (27 July 2011). "NASA picks Mars landing site". Nature. 475 (7357): 433.</ref>
-There is strong evidence that water once flowed in the crater.  The Mars Reconnaissance Orbiter discovered iron/magnesium smectites here.  Smectites are clay minerals. .<ref>Grotzinger, J. and R. Milliken (eds.)  2012.  Sedimentary Geology of Mars.  SEPM</ref>   They can absorb water, as a result thaty shrink and swell depending on how much water they contain. <ref> https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/smectite </ref>  This mineral requires water to form.<ref>Murchie, S. et al.  2009.  A synthesis of Martian aqueous mineralogy after 1 Mars year of observations from the Mars Reconnaissance Orbiter.  Journal of Geophysical Research: 114.</ref>  Finding clay is significant because it forms in water with a pH close to neutral.  This type of environment would support life, and clay can form well-preserved fossils.
+There is strong evidence that water once flowed in the crater.  The Mars Reconnaissance Orbiter discovered iron/magnesium smectites here.  Smectites are clay minerals. .<ref>Grotzinger, J. and R. Milliken (eds.)  2012.  Sedimentary Geology of Mars.  SEPM</ref>   They can absorb water, as a result they shrink and swell depending on how much water they contain. <ref> https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/smectite </ref>  This mineral requires water to form.<ref>Murchie, S. et al.  2009.  A synthesis of Martian aqueous mineralogy after 1 Mars year of observations from the Mars Reconnaissance Orbiter.  Journal of Geophysical Research: 114.</ref>  Finding clay is significant because it forms in water with a pH close to neutral.  This type of environment would support life, and clay can form well-preserved fossils.
 ==Eberswalde Delta==