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Thread of papers from last boost: astrodon.social/@TMEubanks/111…

Horgan et al, "Campaign Overview and Initial Results from Exploration of the Margin Unit in Jezero Crater by the Perseverance Rover"
hou.usra.edu/meetings/lpsc2024…

#JezeroDeltaScience

Figure 1 from the paper
Extract from the preliminary interpretations
#jezerodeltascience
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Fries: "Will MSR Samples Cached on the Martian Surface Experience Significantly Greater Thermal Degradation than Samples Retained in the Rover?"
hou.usra.edu/meetings/lpsc2024…

"The Mars 2020 rover collects samples for Mars Sample Return (MSR). Half are stored in the rover and half on the ground. This paper explores reaction rates within the samples. Samples stored on the ground can see significantly faster reaction rates."

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Beyssac et al : "What Are the Olivine-Rich Boulders in the Upper Fan and Margin Unit at Jezero Crater, Mars?"
hou.usra.edu/meetings/lpsc2024…

"We detail the chemistry and mineralogy of olivine-rich boulders found on the upper fan at Jezero Crater using SuperCam data. These rocks are an olivine-rich cumulate and we discuss their origin."

#JezeroDeltaScience

Fig 1, with familiar views of delta boulders
Fig 2, closeup of grain size
Conclusions
#jezerodeltascience
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Royer et al : "Mineral Composition of Jezero Crater Western Fan Derived by SuperCam/Mars2020 Infrared Spectroscopy and Spectral Modeling"
hou.usra.edu/meetings/lpsc2024…

#JezeroDeltaScience

Conclusions
#jezerodeltascience
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One for #Ingenuity in the "Active Mars: Winds, Flows, and Gravity" session (hou.usra.edu/meetings/lpsc2024…), haiku included 😀

Williams et al: "Aeolian Change Detection Experiment by the Mars Helicopter Ingenuity"
hou.usra.edu/meetings/lpsc2024…

"Mars Heli watches / Wind blowing sand particles / And cleaning off dust."

Figure 2, RTE soil image
#ingenuity
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Another spin on the margin unit composition and formation (re: 1st thread post), coming from a completely different conference session, Organic and Inorganic Carbon on Mars (hou.usra.edu/meetings/lpsc2024…)

Ye et al: "Anti-Correlation Between Olivine and Carbonate Enrichments in Jezero Crater from Orbital Observations"
hou.usra.edu/meetings/lpsc2024…

#JezeroDeltaScience

Fig. 3
Conclusions 1/2
Conclusions 2/2
#jezerodeltascience
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Mineral-rich (pun intended) one page summary of PIXL data

Tice et al: "Regional Paleoenvironments Recorded in Sedimentary Rocks of the Western Fan-Delta"
hou.usra.edu/meetings/lpsc2024…

"Delta sands reveal / Jezero climate deltas / Ancient drying lakes."

#JezeroDeltaScience

Figure 1
Interpretations summary
#jezerodeltascience
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More PIXL for the upper delta, summarized in one sentence: "Upper Fan sedimentary rocks originate from a slightly altered olivine-rich basaltic protolith and are cemented by Fe-Mg carbonates, sulfates, and silica."

Siebach et al: "PIXL Analyses of Sedimentary Rocks in the Mars 2020 Perseverance Upper Fan Campaign in Jezero Crater"
hou.usra.edu/meetings/lpsc2024…

"Jezero delta / Olivine-rich sands glued by / Salts, altered products."

Figure 1, map of the campaign and abration spots
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Preliminary analysis of the samples picked on that same region.

Weiss et al: "Perseverance Samples from the Jezero Upper Fan"
hou.usra.edu/meetings/lpsc2024…

"Perseverance samples of the upper Jezero fan contain materials from the earliest period of martian history and the youngest fluvial activity in the crater."

Figure 1, workspace photos where samples were acquired
Overall conclusions. Fluvial origin, low on organics aqueously-altered basalt
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Mid-thread intermission!!!

Disclaimers:

- #IAmNotAGeologistTMBut
- these are preliminary summaries for a conference, peer-review unknown
- the press release headlines when LPSC starts will most likely tell a completely different story (hype? 😉)
- the thread is for my own reference, but it hopefully helps you too
- adding them in no specific order, I have a long backlog to go through yet

Still haven't even gotten to the session I'm most interested in, sediments & stratigraphy 😀

From #PlanetArtober2023: "Martian Delta" by yours truly
#iamnotageologisttmbut
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I'm still on this thread (conf not coming until mid March), but I got kind of shocked by this one on #KodiakButte, and ended up in a rabbit hole, still grokking it 😉

Kanine et al: "Paleoenvironmental Analysis of Jezero Crater, Mars from Stratigraphy and Sedimentology of Kodiak Butte"
hou.usra.edu/meetings/lpsc2024…

A Kodiak 3D model
skfb.ly/oB6r8

Figure 1, putative unit divisions drawn on 3 views of a Kodiak 3D model. I have questions on b) and the nose tip :-)
Figure 2, the proposed model of migrating river flows instead of lake-delta depositions

M2020 ZCAM -- Kodiak delta remnant*, sol 580 - Download Free 3D model by Mastcam-Z

Sketchfab
#kodiakbutte
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Another one doumbfounding me quite some

Mangold et al: "Past Variations of Water Level of Jezero Paleolake"
hou.usra.edu/meetings/lpsc2024…

"Geometries of topset and foreset strata observed on the front and top of Jezero crater western fan are typical of progradation during forced regression due to the decrease of the water level"

Figure 3 and conclusions
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The sedimentary session (hou.usra.edu/meetings/lpsc2024…) is mostly about Gale. I don't follow Curiosity as much, so I enjoyed this view of the recent traverse to grasp the geological context.

Wilson et al : "The Nature and Location of the Upper Gediz Vallis Ridge Basal Contact in Gale Crater"
hou.usra.edu/meetings/lpsc2024…

Figure 1, perspective view of Gediz Vallis.
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Estimated Gediz Vallis alluvial fan, emanating from Mount Sharp towards the crater floor and long eroded by winds

Bryk et al: "In Situ Investigations of the Gediz Vallis Ridge: A Remnant Late-Stage Debris Flow Dominated Fan Deposit in Gale Crater"
hou.usra.edu/meetings/lpsc2024…

Look around in MUTED muted.wwu.de/?x=137.380&y=-4.7…

Figure 4, putative Gediz Vallis fan overlaid on a CTX mosaic of northern Gale

MUTED

The Multi-temporal Database of Planetary Image Data is a tool to identify the spatial and temporal coverage of planetary image data from Mars, Moon, and Mercury
muted.wwu.de
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This one lists possible processes for those tilted blocks Perseverance has also seen (mastodon.social/@sharponlooker…)

Newsom et al: "Gale Crater Block Fields — Role of Dissolution & Other Processes"
hou.usra.edu/meetings/lpsc2024…

"Some exposed stratigraphic layers in Gale crater, Mars, consist of tilted blocks of formerly flat-lying sediments. The processes responsible could involve a combination of dissolution, periglacial, aeolian lag formation, & lacustrine wave action."

Figures 1a & 1b, views of disrupted block fields.

V Martín

2024-02-20 19:13:23


Amalgamation & coating for the "plaster" and steeply-dipping deformed laminations. At first sight, just a short analysis of these in this paper.
Figure 10
Extract of figure 7

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This rock photographed by Perseverance recently, was special enough to deserve its own paper

Beck et al : SuperCam Detections of Hydrated-Silica in the Jezero Crater
hou.usra.edu/meetings/lpsc2024…

"We present the identification of a hydrated-silica rich float rock by SuperCam within the Jezero crater."

Figure 1, zoomed view of a mottled rock sticking out of regolith
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... and it's also highlighted here

Beck et al: "Discovery of Light-Toned Float Rocks in Jezero Crater: A Tale of Aqueous Alteration and High-Temperature Metamorphism"
hou.usra.edu/meetings/lpsc2024…

Extract from the conclusions, suggesting that these light-toned float rocks are late-comers to the crater from nearby Syrtis Major
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Interesting one, Perseverance may visit polygonal ridges after leaving Jezero. This reminds me of the Zooniverse "Planet Four: Ridges" project, @megschwamb , were there any results published?

Valantinas et al : "‘Windows’ into Mars’ Potentially Habitable Subsurface in the Context of NASA’s Perseverance Extended Mission"
hou.usra.edu/meetings/lpsc2024…

"We explore the potential of ancient biosignatures in Nili Planum and on Mars by studying polygonal ridges using deep learning and spectroscopy."

Figure 1, examples of polygonal ridges on Nili Planum
@Meg Schwamb
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Banging the drum for the necessity of continuing the sampling outside of Jezero and making sure MSR goes all the way, despite difficulties.

Ehlmann et al: "Decadal Science from Mars Sample Return: The Importance of Sampling In-Place Nili Planum Noachian Strata Accessible Outside Jezero Crater for Priority Planetary Science Questions"
hou.usra.edu/meetings/lpsc2024…

Collaged figure from the paper, with proposed rover routes, stratigraphic column of the whole region and estimated geologic timeline
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Another one in the same theme

Mustard J. F. : "Critical Geologic Record of the First Billion Years of Mars History Accessible by Perseverance for Mars Sample Return"
hou.usra.edu/meetings/lpsc2024…

"The suite of samples currently on Perseverance will only touch on a subset of the top science questions possible from the site. The set that will truly revolutionize Mars science MUST include samples from Jezero’s rim and beyond to Nili Planum. "

Figure 2 with proposed route outside the crater and potential sampling sites + closing arguments
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Another shock for me. Having read interpretations of the "curvilinear unit" based on space observations (mastodon.social/@sharponlooker…), it took me a while to grasp what this paper says abt Tenby

Caravaca et al: SURFACE EXPRESSION AND GEOMETRIES OF DELTAIC DEPOSITS OF JEZERO WESTERN FAN TOP
hou.usra.edu/meetings/lpsc2024…

In the absence of the 3D model, I looked at the same spot in NeV-T's gigapan (gigapan.com/gigapans/232028), and only by looking towards the opposite direction, does the penny start to drop.

Figure 3 from the paper, snapshot of the yet unpublished 3D model of the Tenby outcrop. Rock marked with a red X for comparison with gigapan from next pic. The paper states these are truncated foresets.
Snapshot of the gigapan, showing the same area as the 3D model but from a slightly different angle. X-marked rock for reference. The panorama perspective distorts the dip angles.
Another gigapan snapshot, the leftmost view, where the foreset structure is easier to grasp despite the slight distortion.
Snapshot from https://mars.nasa.gov/maps/location/?mission=M20, centered at sol 736, sample nr 19. Both Carew Castle and the Tenby outcrop are in view from space.

PERSEVERANCE 737-743

PERSEVERANCE 737-743 © NASA/JPL-Caltech/MSSS/ASU/NeV-T Gigapan - http://www.gigapan.com/gigapans/232028 GIGAmacro - https://viewer.gigamacro.com/view/POp3Di1lNN8T8q5M?x1=73970.50&y1=-16693.50&res1=77.05&rot1=0.00 Flickr - https://www.flickr.
www.gigapan.com

V Martín

2023-08-20 21:27:50


I found this old(ish) paper about #JezeroCrater and the delta really educative and accessible even when #IAmNotAGeologistTMBut

Schon et al. "An overfilled lacustrine system and progradational delta in Jezero crater, Mars: Implications for Noachian climate"
researchgate.net/publication/2…

A lot of substance and recognizable features in almost every figure, some examples:

Fig 4. : Topographic profiles from MOLA point data of Jezero crater (top) and a similarly sized fresh crater (bottom) found in Elysium Planitia (8.25 1 N, 125.75 1 E). This comparison shows that Jezero crater (top) has experienced approximately 1-km of infilling compared to the morphologically fresh crater. Lake level is shown at À 2400 m as suggested by the elevation of the outlet.
Fig. 10: Escarpment of the deltaic deposits truncates a scroll bar. The orientation of this meander indicates that the direction of migration was proximal (toward the watershed, away from the escarpment). This orientation requires a more extensive delta in the past.
Fig. 12: Scroll bars. Numerous scroll bars (lateral accretion topography) are observed adjacent to Belva crater on the delta plain and stratigraphically below erosionally-resistant materials interpreted as channel sands. These features (A–H) result from the development of point bars at the inside of distributary channel meander bends. Arrows indicate the direction of channel migration. Unconformities in the scroll bar patterns are common and suggest successive channel migrations.
Fig. 14: Channel deposits. (A) Stratigraphically above the scroll bars and epsilon cross-bedding are elongate erosionally resistant materials interpreted as channel sands. Consistent with the interpretation of a more extensive delta in the past, these channel sands would have been deposits in distributary channels sourcing more distal depocenters, and are high-standing because they are more erosionally resistant than overbank deposits. (B) Channels sands are mapped in green, scroll bars in blue, and craters in purple.

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Another context view, snapshot of @NeV_T 's gigapan for sol 762. The top of Kodiak is also visible in the background

gigapan.com/gigapans/232177

Tenby/Skrinkle Haven on center-left, Kodiak butte in the mid background, a little of Carew Castle on the right.

PERSEVERANCE 762-E

PERSEVERANCE 762-E © NASA/JPL-Caltech/MSSS/ASU/NeV-T Gigapan - http://www.gigapan.org/gigapans/232177 GIGAmacro - https://viewer.gigamacro.com/view/vRK5e4QzYhsVFkyT?x1=58711.60&y1=-7219.96&res1=42.79&rot1=0.00 Flickr - https://www.flickr.
www.gigapan.com
@NeV-T
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Here's a potential improvement target for image wizards, that mosaic of Curiosity's RMI snaps could be better?

Gallegos et al: "Evidence of strandlines from a late lacustrine event within Gale crater"
hou.usra.edu/meetings/lpsc2024…

Figure 1, mosaic of the crater rim & associated bajada
Conclusions: Based on visual observations and analytical techniques, we find the horizontally continuous, linear benches on the northeast and northwest Gale crater rim bajada to be paleolake strandline deposits from a recent (<2 Ga) lacustrine event. This parallels evidence of other late alluvial and fluvial events observed within the crater as well as other potential strandlines proposed
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Who said it's nice and cozy inside those sample return capsules? 🙃

Ballouz et al: "Investigating the Physical Modification of the Bennu Sample During Entry, Descent, and Landing"
hou.usra.edu/meetings/lpsc2024…

Figure 1, a grain jigsaw
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I think I went through all the papers I wanted covered, from now on, it's peer-reviewed research 😉

mastodon.social/@sharponlooker…

V Martín

2024-02-20 18:58:06


Stack et al: "Sedimentology and Stratigraphy of the Shenandoah
Formation, Western Fan, Jezero Crater"

Peer-reviewed, open access

agupubs.onlinelibrary.wiley.co…

#JezeroDeltaScience


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For LPSC completeness, here's the Lucy/Dinkinesh thread

mastodon.social/@sharponlooker…

V Martín

2024-02-11 19:49:14


Several papers from the #LucyMission session (hou.usra.edu/meetings/lpsc2024…) promising more information & analysis from other instruments during the conference. Some of the instruments aren't really tuned to this asteroid type.

This one paper has a "false color" MVIC view

Kaplan et al: Multi-Spectral Imaging Observations of Asteroid Dinkinesh by the Lucy Mission
hou.usra.edu/meetings/lpsc2024…

#DinkineshAndSelam

Figure 1: A MVIC Closest Approach false color composite showing Dinkinesh and Selam
Final conclusions from the paper

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Let me finish this #LPSC2024 thread with a #DwarfPlanetCeres paper, covering features I always found amusing in #DawnMission photos. Attached is one of my favs, in Kupalo crater (right "besides" Juling) photojournal.jpl.nasa.gov/jpeg…

Le Becq et al: "A new model of crater degradation on Ceres involving ice sublimation"
hou.usra.edu/meetings/lpsc2024…

Thread start: mastodon.social/@sharponlooker…

Figure 1, "canon" example of a talus unit
Figure 2, sketch of the talus evolution
Crop of a Dawn LAMO photo of the rim of Kupalo crater.

V Martín

2024-02-03 23:31:13


Thread of papers from last boost: astrodon.social/@TMEubanks/111…

Horgan et al, "Campaign Overview and Initial Results from Exploration of the Margin Unit in Jezero Crater by the Perseverance Rover"
hou.usra.edu/meetings/lpsc2024…

#JezeroDeltaScience

Figure 1 from the paper
Extract from the preliminary interpretations

#dwarfplanetceres #dawnmission #lpsc2024
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Another Le Becq's summary of this new model, now on "Planetary Geomorphology Image of the Month"

planetarygeomorphology.wordpre…

#DwarfPlanetCeres

Image 2: Schematics of the proposed new model of impact crater degradation on Ceres, driven by the ice sublimation within the outcrops, and the formation of talus slopes. The 3D blocks diagrams show the schematic evolution of a crater wall from impact to the disappearance of the talus deposit, and images below show the different stages of evolution of the crater wall as actually observed on Ceres.

The effect of ice on the degradation of impact craters on Ceres

Post contributed by Noé Le Becq, PhD candidate, Laboratoire de Planétologie et Géosciences, Nantes (France) Ceres was discovered in 1801 by Giuseppe Piazzi and is located in the main asteroid belt …
Planetary Geomorphology Image of the Month
#dwarfplanetceres
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Meg Schwamb
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We wrote a paper with a whole bunch of new ridge locations
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V Martín
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@megschwamb darn, I missed the memo 😉 I'm guessing you are referring to the one mentioned in this blog right?

blog.planetfour.org/2022/01/31…

The zooniverse P4:Ridges project is missing a results tab, but links to the blog are there somewhere.


An Update on Planet Four: Ridges

Today we have a guest post by Adi Khuller. Adi is a 3rd-year PhD student at the School Of Earth and Space Exploration at Arizona State University. Woohoo!! Our project’s first research paper was fi…
Planet Four Blog
@Meg Schwamb

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That last few years have been strange so it might have been easy to miss it. If I get time I'll try and get a results page up
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@megschwamb strange years for everyone... Mind you, I may have had the blog opened in one of dozens tabs in some discarded device

I remember switching to Catalina Sky Survey zooniverse projects from P4R due to its much simpler workflow. Simpler in the sense that I'd feel more secure in the classifications, whereas with P4R there was always a nagging feeling that I was missing things. That was before Perseverance and more looking at CTX pics, today it'd be a completely different feeling 😉

Thx!

@Meg Schwamb
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