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GeoRef Categories
Era and Period
Epoch and Age
Date
Availability
Galilean satellites
A reinterpretation of the past 2.5 billion years of Earth’s tectonic history: Two episodes each of plate and single-lid tectonics Available to Purchase
An Overview of Exoplanet Biosignatures Available to Purchase
Tidal Heating in Io Available to Purchase
Io’s Volcanic Activity and Atmosphere Available to Purchase
The Cycles Driving Io’s Tectonics Open Access
The Internal Structure of Io Available to Purchase
Io: A Unique World in our Solar System Available to Purchase
Perspective: The Future Exploration of Io Available to Purchase
An overview of GPR subsurface exploration of planets and moons Available to Purchase
Sulfur isotopes as biosignatures for Mars and Europa exploration Open Access
Ocean Worlds In Our Solar System Available to Purchase
The Quest For Water Available to Purchase
Resonances of the InSight Seismometer on Mars Available to Purchase
Chemical reactions in the Fe 2 SiO 4 -D 2 system with a variable deuterium content at 7.5 GPa Available to Purchase
Experimental investigation of the effect of nickel on the electrical resistivity of Fe-Ni and Fe-Ni-S alloys under pressure Available to Purchase
Hydrogen, Hydrocarbons, and Habitability Across the Solar System Available to Purchase
Carbonic acid monohydrate Available to Purchase
Raman spectroscopy as a tool to study the solubility of CO 2 in magnesium sulphate brines: application to the fluids of Europa’s cryomagmatic reservoirs Available to Purchase
NASA volcanology field workshops on Hawai‘i: Part 2. Understanding lava flow morphology and flow field emplacement Available to Purchase
The Big Island of Hawai‘i presents ample opportunities for young planetary volcanologists to gain firsthand field experience in the analysis of analogs to landforms seen on Mercury, Venus, the Moon, Mars, and Io. In this contribution, we focus on a subset of the specific features that are included in the planetary volcanology field workshops described in the previous chapter in this volume. In particular, we discuss how remote-sensing data and field localities in Hawai‘i can help a planetary geologist to gain expertise in the analysis of lava flows and lava flow fields, to understand the best sensor for a specific application, to recognize the ways in which different data sets can be used synergistically for remote interpretations of lava flows, and to gain a deeper appreciation for the spatial scale of features that might be imaged in the planetary context.
Central pit craters: Observations from Mars and Ganymede and implications for formation models Available to Purchase
Central pit craters are common on ice-rich bodies, such as Mars, Ganymede, and Callisto. Mars and Ganymede represent the two end members regarding target characteristics (mixed ice and soil for Mars vs. almost pure ice for Ganymede). Comparisons of central pit craters on these two bodies can provide insights into the environmental conditions under which these craters form and provide constraints on the proposed formation models. This analysis includes 1604 central pit craters on Mars and 471 central pit craters on Ganymede. Martian central pit craters are divided into floor pits and summit pits, whereas all central pit craters on Ganymede are floor pits. Central pit craters form in similar-diameter ranges on both Mars and Ganymede when gravity differences are considered, and both bodies show no regional variations in pit crater distribution within the ±60° latitude zone. Martian floor pits are larger relative to their parent crater than summit pits, but the Ganymede pit/crater diameter ratio is larger than for either central pit type on Mars. Central pits have formed over the entire history of both bodies, and there is no indication that excavation depths have varied over time. Lack of crater floor updoming in Martian floor pit craters indicates that low concentrations of ice (estimated at ~20%) still allow production of central pits. The results of this study argue against central peak collapse as the formation mechanism for central pit craters. Excavation into a subsurface liquid layer cannot be ruled out but is difficult to support based on the distributions and consistencies in excavation depth on both bodies. These results support the model of vaporization and gas escape for central pit formation on both Mars and Ganymede.