E. Grin's research while affiliated with SETI Institute and other places

Publications (34)

Article
Single-crystal (U-Th)/He dating of 32 apatite and zircon crystals from an impact breccia yielded a weighted mean age of 663 ± 28 ka (n = 3; 4.2 % 2σ uncertainties) for the Monturaqui impact structure, Chile. This ∼350 m diameter simple crater preserves a small volume of impactite consisting of polymict breccias that are dominated by reworked target...
Article
Processes, environments, and the energy associated with the transport and deposition of sand at Gusev crater are characterized at the microscopic scale through the comparison of statistical moments for particle size and shape distributions. Bivariate and factor analyses define distinct textural groups at 51 sites along the traverse completed by the...
Conference Paper
Full-text available
We present a proposed technique for identifying martian caves using THEMIS infrared images.
Conference Paper
Full-text available
We report a (U-Th)/He apatite and zircon single crystal age of 663 ± 90 ka for Monturaqui impact structure (Chile), which acts as an ultimate test of the applicability of the (U-Th)/He technique for dating very small, young impact structures.
Conference Paper
We present results for soils at Gusev from landing to Troy and the sedimentology database for the MER mission that is being organized and will be made available to the planetary community for, i.e., modeling and landing site selection activities.
Conference Paper
Monturaqui (Chile) is a small young impact with five melt rock compositions: (1) bulk melt of plag. + quartz, (2) bulk melt of ignimbrite target rock, and (3) multi-component melts with iron-rich impactor, non-modal biotite melt, and target rock.
Article
Full-text available
When remotely navigating a mobile robot, operators must estimate the slope of local terrain in order to avoid areas that are too steep to climb or that slope so steeply downward that the operator would lose control of the rover. Although many rovers are equipped with sensor systems to aid the operator in this task, it is sometimes necessary to esti...
Conference Paper
Full-text available
Regions on Mars likely to contain caves and/or cave-bearing geology are identified using multispectral imagery from orbital missions and the exploration of terrestrial analogs for the characterization of associated thermal, and geo-signatures.
Article
A total of 3140 individual particles were examined in 31 soils along Spirit's traverse. Their size, shape, and texture were quantified and classified. They represent a unique record of 3 years of sedimentologic exploration from landing to sol 1085 covering the Plains Unit to Winter Haven where Spirit spent the Martian winter of 2006. Samples in the...
Article
Full-text available
The Atacama Desert, one of the most arid landscapes on Earth, serves as an analog for the dry conditions on Mars and as a test bed in the search for life on other planets. During the Life in the Atacama (LITA) 2004 field experiment, satellite imagery and ground-based rover data were used in concert with a `follow-the-water' exploration strategy to...
Article
Full-text available
Gusev crater was selected as the landing site for Spirit on the basis of morphological evidence of long-lasting water activity, including possibly fluvial and lacustrine episodes. From the Columbia Memorial Station to the Columbia Hills, Spirit's traverse provides a journey back in time, from relatively recent volcanic plains showing little evidenc...
Article
Full-text available
Researchers have previously described a mobile robot, or rover, operator's difficulty in accurately perceiving the rover's tilt and roll, which can lead to rollover accidents. Safe mobile robot navigation and effective mission planning also require an operator to accurately interpret and understand the geometry and scale of features in the rover's...
Conference Paper
We have integrated a biomarker detection system with a rover for the search for sparse life in extreme environments. The system incorporated a pulsed fluorescence imager, a reagent sprayer, and a surface scraping device for remote detection of fluorescence signals.
Article
Full-text available
Humans are often blamed for errors in complex systems. A number of taxonomies exist for classifying human errors, but recent doubts have been raised as to whether these are actually errors or simply processes involved in both correct and incorrect decisions. A field test was designed to address some of these issues. During the field test, three geo...
Conference Paper
We have used the Pancam and Microscopic Imager on the Opportunity rover at Meridiani Planum to understand the soil characteristics within the 20 m diameter crater where the rover landed. The majority of the soils consist of a well sorted lag deposit composed of millimeter-size grains of multiple sources superimposed on a finer soil matrix. The mill...
Article
We are presently investigating the biological population present in the highest and least explored perennial lakes on earth in the Bolivian and Chilean Andes. In this work we report the morphology and phylogenetic characterization of two isolates.
Conference Paper
Communication Habitats extrêmes pour les communautés de diatomées dans les lacs de haute altitude (Laguna Blanca et lac de cratère du volcan Licancabur, Bolivie) Kiss K.T.1, Ács É.1, Borics G.2, Cabrol N.3, Grigorszky I.4, Grin E.3, Kiss Á.5, Szabó K.1 & Tóth B.1 1 Hungarian Danube Research Station of inst.Ecol.Bot. of Hung.Acad.Sci, Göd, Hongr...
Article
Robotic exploration of the Martian surface requires numerous interpretations of imaged data, where incorrect results can have drastic consequences. The imaging process transforms and reduces the amount of information available. Three experiments measured the differences in interpretation between imaged sediments and physical sediments. Three charac...
Article
The Gusev Crater/Ma'adim Valis region of Mars is a finalist for the 2003 Mars Exploration Rover Mission. An analysis of the geological morphology of the landing ellipse was performed to characterize the area in terms of potential hazards to the rover and the scientific value of the site.The project utilized high-resolution images from the Mars Orbi...
Article
Full-text available
The 5916 m-high Licancabur volcano (Chile/Bolivia) hosts the highest and one of the least explored lakes in the world. At this altitude, the environment combines low-oxygen, high-UV radiation, and low atmospheric pressure (~470 mb). While the lake is ice-covered during part of the year, its bottom water temperature remains above freezing year-round...
Article
It is well recognized that interpretations of Mars must begin with the Earth as a reference. The most successful comparisons have focused on understanding geologic processes on the Earth well enough to extrapolate to Mars' environment. Several facets of terrestrial analog studies have been pursued and are continuing. These studies include field wor...
Article
Full-text available
We report on a field experiment held near Silver Lake playa in the Mojave Desert in February 1999 with the Marsokhod rover. The payload (Descent Imager, PanCam, Mini-TES, and Robotic Arm Camera), data volumes, and data transmission/receipt windows simulated those planned for the Mars Surveyor mission selected for 2001. A central mast with a pan and...
Article
ABSTRACT: It is well recognized that interpretations of Mars must begin with the Earth as a reference. The most successful comparisons have focused on understanding geologic processes on the Earth well enough to extrapolate to Mars' environment. Several facets of terrestrial analog studies have been pursued and are continuing. These studies include...
Conference Paper
Frost mound is a generic term for all mounds involving: volumetric expansion of water when changing to ice; hydrostatic and/or hydraulic pressure of groundwater; and forces of crystallization during freezing. The variety of structures (perennial and seasonal) includes pingos, hydrolaccoliths, palsas, hummocks, frost and icing blisters, and icing mo...

Citations

... Australia and Chile are among the most chemically extreme environments on Earth and host many diverse ecosystems of extremophiles (e.g., Warren-Rhodes et al., 2007;Mormile et al., 2009;Wierzchos et al., 2011;Johnson et al., 2015;Johnson et al., 2019). The water chemistry of these acid lakes in Western Australia fluctuates with flooding and evaporation, producing acidity levels measured at ~1-7 pH and salinities as high as 32% dissolved solids (Benison et al., 2007;Bowen and Benison, 2009 overlain by ferrous clays in purple, then the spectral "doublet" unit in yellow including sulfates, followed by Al-rich phyllosilicates and opal in blue, and covered by nanophase aluminosilicates (e.g. ...
... Capture resolution was 25%, 50%, 75%, or 100% of full resolution available during the LITA investigation. The probabilities represent estimations based on the reviewed visualsearch literature and research on how well geologists detect targets in images [41]. The findings, as shown inFig. ...
... Previous attempts to determine the age of impact structures, such as the Chesapeake Bay crater, have mainly focused on the use of 40 Ar/ 39 Ar or U/Pb geochronometers (e.g., Jourdan et al. [2012] and references therein). Recently, (U-Th)/He thermochronology of apatite, titanite, and zircon has proven to be another valuable isotopic system for this purpose (e.g., Ukstins Peate et al. 2010;Van Soest et al. 2011;Wartho et al. 2012;Young et al. 2013aYoung et al. , 2013bBiren et al. 2014Biren et al. , 2016Wielicki et al. 2014). In order to augment previous attempts to date the Chesapeake Bay event using a variety of isotopic and fission track chronometers, we have used the (U-Th)/He method to date 21 individual zircon grains in an unconsolidated sediment from ODP site 1073 hole A, located~390 km northeast of the Chesapeake Bay impact structure (Fig. 2). ...
... The long axis of each measured particle was chosen as proxy for grain size. This choice allows direct comparisons with some previous work (Banham et al., 2018;Cousin et al., 2017;Ehlmann et al., 2017;Jerolmack et al., 2006), but results in small systematic differences with other work that includes or emphasizes measurements of different grain dimensions and/or utilizes different measurement techniques (e.g., Cabrol et al., 2014;Gough et al., 2021;Minitti et al., 2013;Sullivan & Kok, 2017, Sullivan et al., 2020. As pointed out by Gough et al. (2021), the cumulative collection of MAHLI hand lens-quality images of Martian sands collected so far at Gale represents a very small data set that portrays extremely small, two-dimensional samples, compared with the volumes of sieve-partitioned sand fractions typical of terrestrial sediment analyses. ...
... Cave entrances typically appear as warm features in thermal imagery acquired at night and cool features in midday imagery (e.g., [1,36,47,48]) because cave entrances are generally characterized by smaller diurnal temperature changes than the surrounding surface rock. Deep interior cave temperatures are typically stable (e.g., [49,50]) due to diurnal surface temperatures, which are dampened via thermal conduction of the geologic substrate [51,52]. ...
... (e.g., [3][4][5][6]. Aside from this, differences in the analytical frameworks have led to concern that information may be inaccurate and even contradictory. ...
... On Mars, landscapes that include small, elongate to circular mounds hypothesised to be pingos, as well as other possible periglacial features have been identified in three areas: (1) the vast northern plains (Kargel and Costard, 1993;Parker and Banerdt, 1999;Seibert and Kargel, 2001) encompassing Acadilia (Lucchitta, 1981), Chryse (Theilig and Greeley, 1979), Elysium (De Hon, 1997;Rice et al., 2002), and Utopia Planitiae (Tanaka et al., 2000;Seibert and Kargel, 2001; Thomson and Head, 2001); (2) Vastitas Borealis (Greeley and Guest, 1987); and (3) the Gusev crater (Cabrol et al., 1997(Cabrol et al., , 2000Grin and Cabrol, 1998). Water is thought to have played an important role in the landscape evolution of each area. ...
... The GPS unit of the bathymetric system was used by the divers to co-register the location of bottom sediment samples on the maps. Results from the preliminary investigation of phytoplankton were detailed in Acs et al. (2003), Kiss et al. (2004), and Cabrol et al. (2007b) and are not discussed here. p0260 DNA was extracted from seven of the sediment samples (20 cm, 50 cm, 2 m, 2.5 m, 3.0 m, 3.5 m, and 4.0 m) with a PowerSoil DNA Purification Kit (MoBio, Carlsbad, CA). ...
... Using these advanced software tools, we analyzed a database of 20,000 sand particles to address questions of sediment transport and deposition at Gusev Crater. This analysis expands previous textural characterizations started by Cabrol et al. [2005Cabrol et al. [ , 2006Cabrol et al. [ , 2007Cabrol et al. [ , 2008aCabrol et al. [ , 2008bCabrol et al. [ , 2009] by surveying soils from Winter Haven to the Scamander Crater and revisiting the previously studied soils from the Columbia Memorial Station (CMS) to Winter Haven in order to produce a coherent and integrated data set for the entire traverse of the Spirit rover. ...
... To date, Mars mission imaging has yielded views of vertical pits or shafts of various sizes and descriptions in volcanic terrains that may be associated with some form of extensional tectonics, collapse of material into an emptied magma chamber, or other processes (Wyrick et al., 2004;Cushing et al., 2007;Smart et al., 2011;Cushing, 2012;Halliday et al., 2012). Caves on Mars were speculated about before they were identified (e.g., Grin et al., 1998Grin et al., , 1999, and chains of collapse pits are now visible in many locations on Mars and interpreted as possible lava tubes, sinuous rilles, or other volcanic subterranean features (Boston, 2004;Cabrol et al., 2009); see Fig. 24. Such features appear to be a by-product of lava flows or dikes as they are here on Earth, and these can be made by a variety of mechanisms (Kempe et al., 2006;Kempe, 2009). ...