Jose Alexis Palmero Rodriguez

Jose Alexis Palmero Rodriguez
Planetary Science Institute

PhD

About

161
Publications
13,303
Reads
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1,600
Citations
Additional affiliations
May 2015 - September 2015
Planetary Science Institute
Position
  • Senior Researcher
February 2012 - March 2014
NASA Ames
Position
  • NPP post-coctoral fellow

Publications

Publications (161)
Article
Full-text available
The clockwise spiral of troughs marking the Martian north polar plateau forms one of the planet’s youngest megastructures. One popular hypothesis posits that the spiral pattern resulted as troughs underwent poleward migration. Here, we show that the troughs are extensively segmented into enclosed depressions (or cells). Many cell interiors display...
Article
Full-text available
The oldest terrains of Mars are cratered landscapes, in which extensive valleys and basins are covered by ubiquitous fluvial plains. One current paradigm maintains that an impact-generated megaregolith underlies these sediments. This megaregolith was likely largely generated during the Early Noachian (~4.1 to ~3.94 Ga) when most Martian impact basi...
Article
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Mercury’s images obtained by the 1974 Mariner 10 flybys show extensive cratered landscapes degraded into vast knob fields, known as chaotic terrain (AKA hilly and lineated terrain). For nearly half a century, it was considered that these terrains formed due to catastrophic quakes and ejecta fallout produced by the antipodal Caloris basin impact. He...
Article
Selenophysical parameters can be estimated based on admittance between gravity and topography, especially high-precision GRAIL gravity and LOLA topography data. These parameters include load ratio between subsurface and surface loads, crustal thickness, crustal density, and effective elastic thickness. Considering non-negligible membrane stress, th...
Article
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The Martian outflow channels comprise some of the largest known channels in the Solar System. Remote-sensing investigations indicate that cataclysmic floods likely excavated the channels ~3.4 Ga. Previous studies show that, in the southern circum-Chryse region, their flooding pathways include hundreds of kilometers of channel floors with upward gra...
Article
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In this paper, we propose an inverse method for full gravity gradient tensor data in the spherical coordinate system. As opposed to the traditional gravity inversion in the Cartesian coordinate system, our proposed method takes the curvature of the Earth, the Moon, or other planets into account, using tesseroid bodies to produce gravity gradient ef...
Article
Gravity data provide information about the internal mass dis- tribution of celestial bodies. The latest gravity field model of Mercury, HgM007, has a higher spatial resolution than previously published gravity models, al- lowing smaller crustal structures to be resolved. In this study, a global free- air gravity anomaly grid of Mercury was derived...
Article
The Grimaldi impact basin is located near the western limb of the moon and lies to the southwest of the Oceanus Procellarum. A clearly visible positive gravity anomaly exists in its low-lying inner wall, implying a subsurface mass concentration beneath the crater. Exploration of this basin could extend our meaningful and fundamental understanding o...
Article
Full-text available
It has been proposed that ~3.4 billion years ago an ocean fed by enormous catastrophic floods covered most of the Martian northern lowlands. However, a persistent problem with this hypothesis is the lack of definitive paleoshoreline features. Here, based on geomorphic and thermal image mapping in the circum-Chryse and northwestern Arabia Terra regi...
Conference Paper
Full-text available
Introduction: Most geochemical models of aque-ous mineral precipitation on Mars often assume either (i) static closed system conditions only, or (ii) semi-open system conditions (i.e., open to the atmosphere but closed in the basal interface) allowing ionic exchange between the gas phases (H 2 O, CO 2 , Cl 2 , SO 2) and the solution through the wat...
Conference Paper
Tsunami waves flooded martian glacier valleys and rafted large volumes of glacial ice into the oceans during the backwash retreat phase.
Article
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At the time before ∼3.5 Ga that life originated and began to spread on Earth, Mars was a wetter and more geologically dynamic planet than it is today. The Argyre basin, in the southern cratered highlands of Mars, formed from a giant impact at ∼3.93 Ga, which generated an enormous basin approximately 1800 km in diameter. The early post-impact enviro...
Article
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Catastrophic floods of enormous proportions are thought to have played a major role in the excavation of some of the Solar System’s largest channels; the circum-Chryse outflow channels. The generation of the floods has been attributed to both the evacuation of regional highland aquifers and ancient paleo-lakes. Numerous investigators indicate that...
Article
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Catastrophic floods generated ~3.2 Ga by rapid groundwater evacuation scoured the Solar System's most voluminous channels, the southern circum-Chryse outflow channels. Based on Viking Orbiter data analysis, it was hypothesized that these outflows emanated from a global Hesperian cryosphere-confined aquifer that was infused by south polar meltwater...
Article
The publisher regrets that due to miscommunication during the production process, an error was introduced into the caption of Fig. 3. In the second sentence of the caption ("Location and viewing direction…"), the sentence should read instead "Location and viewing direction of panel (b) shown (black dot and hollow arrow, respectively)."
Article
Morphological evidence for ancient channelized flows (fluvial and fluvial-like landforms) exists on the surfaces of all of the inner planets and on some of the satellites of the Solar System. In some cases, the relevant fluid flows are related to a planetary evolution that involves the global cycling of a volatile component (water for Earth and Mar...
Article
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The details of the structure of the core are important to understanding the evolution and thermal history of the Moon. Even with existing information, including seismic measurements from the Apollo mission, as well as geodetic measurements from Lunar Laser Ranging (LLR) data and gravity, it is still difficult to constrain the size of the lunar core...
Article
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Lithium (Li), the lightest of the alkali elements, has geochemical properties that include high aqueous solubility (Li is the most fluid mobile element) and high relative abundance in basalt-forming minerals (values ranking between 0.2 and 12 ppm). Li isotopes are particularly subject to fractionation because the two stable isotopes of lithium – 7L...
Conference Paper
Curvilinear furrows identified in the Hellas Basin, indicative of iceberg transport and grounding on very cold oceans on early Mars.
Conference Paper
Full-text available
Using Mars Reconnaissance Orbiter (MRO) Context (CTX) image data in combination with Mars Orbiter Laser Altimeter (MOLA) surface topography we have characterized and mapped the geomorphology of Chryse Chaos, an extensive chaotic terrain located in northern Simud Valles. Here, we propose that the development of this chaotic terrain was mostly the re...
Article
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We used MER-derived semi-autonomous rover science operations strategies to determine best practices suitable for remote semi-autonomous lunar rover geology. Two field teams studied two glacial moraines as analogs for potential ice-bearing lunar regolith. At each site a Rover Team commanded a human rover to execute observations based on common MER s...
Article
Gale crater is a ~154-km-diameter impact crater formed during the Late Noachian/Early Hesperian at the dichotomy boundary on Mars. Here we describe potential evidence for ancient glacial, periglacial and fluvial (including glacio-fluvial) activity within Gale crater, and the former presence of ground ice and lakes. Our interpretations are derived f...
Conference Paper
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The lower outflow channels of southern circum-Chryse contain extensive chaotic terrains. We propose these were produced by the collapse of ice-rich debris flows.
Conference Paper
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Results from mapping the geology of Central Valles Marineris, Mars. Eight material categories are mapped based on geomorphic expressions and geologic origins.
Conference Paper
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Using Mars Reconnaissance Orbiter (MRO) Context (CTX) and High Resolution Imaging Science Experiment (HiRISE) image data in tandem with Mars Orbiter Laser Altimeter (MOLA) surface topography, we have characterized and mapped the remnants of an extensive flow feature that we interpret to be a debris flow within the floors of Tithonium Chasma and an...
Article
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Here we provide geologic and geomorphologic evidence of Hesperian glacial activity along the Martian topographic dichotomy in Aeolis Mensae. Our geologic investigation focuses on a fretted plateau unit with networks of deep, flat-bottomed valleys, some of which extend from cirque-like scarps. Based on cross-sectional elevation profiles of the valle...
Article
A Si elemental map was produced by the data of the Kaguya Gamma Ray Spectrometer (KGRS) and the KGRS data were compared with Apollo data.
Chapter
The south polar plateau of Mars constitutes the oldest known deposit of surface ice on Mars. The plateau is dissected by spiral troughs, the formation of which remains poorly understood. Our investigation reveals three distinct morphologic types of south polar troughs, each with a distinct formational history involving unique modes of basement and...
Article
Full-text available
The hydrosphere of Mars has remained mostly concealed within the subsurface for the past ∼3.5 Gyr. Localized rupturing of the permafrost-capped crust led to voluminous groundwater discharges that carved some of the largest known channels in the solar system. However, our knowledge of the nature of the flows and their ultimate fate remains incomplet...
Article
a b s t r a c t Hydrated silicates occur widespread in thousands of locations in the Martian Noachian-aged southern highlands. If an ocean existed on the northern lowlands of Mars during the Noachian, phyllosilicates are likewise expected to be present in the primeval crust of the Martian plains, since on Earth they are common products of continent...
Conference Paper
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The southern cratered highlands province (ACSHP) is one of several Martian provinces that when collectively pieced together distinctly detail the evolution of Mars. In particular, ACSHP unfolds an extremely dynamic early Mars.
Conference Paper
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Geologic mapping and other investigations using post-Viking image and topographic data reveal some fundamental new insights regarding the geologic history of Valles Marineris.
Conference Paper
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Our investigation reveals three distinct morphologic types of south polar troughs, each with a distinct formational history involving unique modes of basement and atmospheric controls.
Article
Abstract– Six large iron meteorites have been discovered in the Meridiani Planum region of Mars by the Mars Exploration Rover Opportunity in a nearly 25 km-long traverse. Herein, we review and synthesize the available data to propose that the discovery and characteristics of the six meteorites could be explained as the result of their impact into a...
Article
We present a preliminary photogeologic map of the Scandia region of Mars with the objective of reconstructing its resurfacing history. The Scandia region includes the lower section of the regional lowland slope of Vastitas Borealis extending about 500–1800 km away from Alba Mons into the Scandia sub-basin below −4800 m elevation. Twenty mapped geol...
Conference Paper
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2 State key laboratory of information engineering on surveying, mapping and remote sensing,
Article
Higher outflow channel dissection in the martian region of southern circum-Chryse appears to have extended from the Late Hesperian to the Middle Amazonian Epoch. These outflow channels were excavated within the upper 1km of the cryolithosphere, where no liquid water is expected to have existed during these geologic epochs. In accordance with previo...
Article
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We present geomorphologic evidence that demonstrates that north polar trough formation did not involve poleward migration. Instead, in situ ablation is proposed to have been the primary formational process of these features.
Article
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Evidence points to glacial flow and melting of a landform in a crater east of Hellas, Mars. A thick blanket of insulating dust might allow melting under the present climate, thus offering an alternative to a modified, warmer recent climate.