A5020527710- Planetary Science and Exploration
- Astro and Planetary Science
- Geology and Paleoclimatology Research
- Space Exploration and Technology
- Hydrology and Sediment Transport Processes
- Methane Hydrates and Related Phenomena
- Space Science and Extraterrestrial Life
- Geological formations and processes
- Paleontology and Stratigraphy of Fossils
- Marine and environmental studies
- Hydrocarbon exploration and reservoir analysis
- Soil erosion and sediment transport
- Spaceflight effects on biology
- Geochemistry and Geologic Mapping
- Hydrology and Watershed Management Studies
- Geological and Geochemical Analysis
- Landslides and related hazards
- Geological Studies and Exploration
- Geological and Geophysical Studies
- Aeolian processes and effects
- Space exploration and regulation
- Hydraulic flow and structures
- Maritime and Coastal Archaeology
- Cryospheric studies and observations
- Tree-ring climate responses
Planetary Systems (United States)
2020-2025
The University of Texas at Austin
2016-2025
Canadian Institute for Advanced Research
2021-2023
John Brown University
2015-2019
Brown University
2011-2017
Abstract We present results from geomorphic mapping and visible to near‐infrared spectral analyses of the Jezero crater paleolake basin its associated watershed. The goal this study is understand provenance sedimentary deposits within open‐basin lake using a source‐to‐sink approach. Two fan located have distinct mineralogic signatures measured by Compact Reconnaissance Imaging Spectrometer for Mars (CRISM). northern spectrally characterized mixture Mg‐rich carbonate olivine, while western...
MESSENGER observations of Mercury’s high northern latitudes reveal a contiguous area volcanic smooth plains covering more than ~6% the surface that were emplaced in flood lava mode, consistent with average crustal compositions broadly similar to terrestrial komatiites.
A well-preserved, ancient delta deposit, in combination with ample exposures of carbonate rich materials, make Jezero Crater Nili Fossae a compelling astrobiological site. We use Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) observations to characterize the surface mineralogy crater and surrounding watershed. Previous studies have documented occurrence olivine carbonates region. focus on correlations between these two well studied lithologies map position shape 1 μm absorption...
Research Article| June 01, 2016 Insights into surface runoff on early Mars from paleolake basin morphology and stratigraphy Timothy A. Goudge; Goudge 1Department of Earth, Environmental Planetary Sciences, Brown University, Providence, Rhode Island 02912, USA *Current address: Jackson School Geosciences, University Texas at Austin, 78712-1722, USA; E-mail: tgoudge@jsg.utexas.edu. Search for other works by this author on: GSW Google Scholar Caleb I. Fassett; Fassett 2Department Astronomy,...
Abstract Silica has the highest demonstrated potential of any phase to preserve microfossils on Earth and therefore may host biosignatures Mars. We detected hydrated silica in Jezero crater, landing site National Aeronautics Space Administration's Mars 2020 rover mission, by applying Dynamic Aperture Factor Analysis/Target Transformation images from Compact Reconnaissance Imaging Spectrometer for Hydrated detections with were verified using commonly accepted analysis methods. The morphology...
Abstract We present new observations of pyroclastic deposits on the surface Mercury from data acquired during orbital phase MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) mission. The global analysis brings total number such identified features 40 to 51. Some 90% are found within impact craters. locations most appear be unrelated regional smooth plains deposits, except some cluster around margins plains, similar relation between many lunar maria. A survey...
Abstract Targeted MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) X‐Ray Spectrometer measurements of Mercury's largest identified pyroclastic deposit are combined with neutron reflectance spectroscopy data to constrain the composition volatiles involved in eruption that emplaced material. The deposit, northeast Rachmaninoff basin, is depleted S (relative Ca Si) C, compared rest surface. Spectral indicate relatively high overall an oxygen‐metal charge transfer (OMCT)...
Abundant evidence exists for valley network‐related fluvial activity near the Noachian‐Hesperian transition on Mars, and areally significant quantities of volcanic ridged plains were emplaced during this period as well. Thus, it is worthwhile to explore hypothesis that lava‐water interaction occurred surface Mars at time. We analyzed morphology, physical properties, composition, ages thirty open‐basin lakes (topographic lows with both an inlet outlet valley) also resurfaced by flows....
Research Article| September 14, 2017 Fluvial stratigraphy of valley fills at Aeolis Dorsa, Mars: Evidence for base-level fluctuations controlled by a downstream water body Benjamin T. Cardenas; Cardenas † 1Jackson School Geosciences, University Texas Austin, 78712, USA †benjamin.cardenas@utexas.edu Search other works this author on: GSW Google Scholar David Mohrig; Mohrig Timothy A. Goudge Author and Article Information Publisher: Geological Society America Received: 08 May 2016 Revision 25...
Abstract Jezero crater is a ~45‐km impact on the margin of Isidis basin Mars. landing site for NASA's Mars 2020 rover mission. The hosts paleolake, and fluvio‐lacustrine deposits formed in this lake remain accessible to exploration. A dark‐toned deposit floor overlies light‐toned carbonate‐bearing has been interpreted as lava flow. We determined average thickness at margins be ~13.0 ± 0.8 m. analyzed statistics craters superposed estimated its model age 2.6 0.5 Ga Hartmann system, placing it...
Abstract Many published interpretations of ancient fluvial systems have relied on observations extensive outcrops thick successions. This paper, in contrast, demonstrates that a regional understanding palaeoriver kinematics, depositional setting and sedimentation rates can be interpreted from local sedimentological measurements bedform barform strata. Dune bar strata, channel planform geometry bed topography are measured within exhumed strata exposed as ridges the Ruby Ranch Member...
<p>Additional details on methods, Figures S1–S6, and Tables S1–S2.</p>
<p>Additional details on methods, Figures S1–S6, and Tables S1–S2.</p>
Little is known about the surface of Earth for first billion years its history, because subaerial deposits this age are very poorly preserved in geologic record. Such could answer important questions atmosphere, climate, and emergence life on primordial terrestrial planets. In contrast, ancient crust Mars far better has undergone minimal deformation. Outcrops &gt;3.6 Ga clay sequences where aluminous minerals overlie iron/magnesium smectite have been interpreted as evidence warm...
Sinuous channels occur across the Solar System, forming by many distinct processes. Qualitative similarities between these have led to hypotheses that some, or all, aspects of channel sinuosity are universal. One aspect shape sinuous is skewness their bends, with alluvial meandering rivers thought dominantly upstream skewed bends. We present new observations test universality bend skewness, comparing 294 bends from lunar volcanic (sinuous rilles), 466 natural and experimental ice melt...
Abstract Impact‐generated hydrothermal systems and postimpact crater lake are well‐documented geological phenomena; however, evidence of venting into impact has rarely been reported. We investigated the well‐preserved contact between hydrothermally altered melt‐bearing breccia (outer/surficial suevite) deposits sampled by Wörnitzostheim drill core at Ries structure, Germany. logged upper 32 m core, describing sedimentary structures general lithological mineralogical variations. Mineralogy...