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all geography including DSDP/ODP Sites and Legs
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Tharsis
Low‐Frequency Marsquakes and Where to Find Them: Back Azimuth Determination Using a Polarization Analysis Approach
An episodic slab-rollback model for the origin of the Tharsis rise on Mars: Implications for initiation of local plate subduction and final unification of a kinematically linked global plate-tectonic network on Earth
CO 2 solubility in primitive martian basalts similar to Yamato 980459, the effect of composition on CO 2 solubility of basalts, and the evolution of the martian atmosphere
An inventory of potentially habitable environments on Mars: Geological and biological perspectives
On Earth, biology, hydrology, and geology are interlinked such that certain types of life are often associated with specific conditions, including rock type, pressure, temperature, and chemistry. Life on Earth has established itself in diverse and extreme niches, presenting the possibility that Mars, too, may hold records of fossilized and/or extant life in diverse environments. Geologic, paleohydrologic, and climatic conditions through the evolution of Mars are similar in many respects to conditions occurring during the evolution of Earth and, as such, may point to environments on Mars with potential to have supported living systems. Here, we discuss examples of those Martian settings. Such extraterrestrial environments should be targeted by international robotic and/or manned missions to explore potential fossilized or extant life on Mars.
Continental-scale salt tectonics on Mars and the origin of Valles Marineris and associated outflow channels
Large-scale features of the crustal structure on Mars, including the hemispherical dichotomy and Tharsis, were established very early in planetary history. Geodynamical models for the origin of the dichotomy and Tharsis, such as lithospheric recycling and a plume from the core-mantle boundary, respectively, involve solid-state mantle flow and are difficult to reconcile with timing constraints. An alternative point of view is that the martian crustal asymmetry and Tharsis can be associated with the upwelling and spreading of large, impact-induced melt regions, i.e., local magma oceans. While the local magma ocean–induced upwelling model satisfies timing constraints on dichotomy and Tharsis formation, it neglects any interaction with longer-timescale mantle dynamics and cannot explain recent volcanic activity at Tharsis. In this study, fully 3-D, spherical shell simulations are used to investigate coupling between local magma oceans and mantle dynamics with radiogenic heating and core heatflow. For low core heat flux, it is found that upwellings driven by local magma ocean buoyancy are transient features of planetary evolution that is dominated by sublithospheric instabilities. With increasing core heat flux, local magma ocean–induced upwellings strongly influence the pattern of thermal plumes from the core-mantle boundary, which can remain stable for ∼4.5 b.y. The predicted melt volumes, present-day melting rate, and crustal structure are compared to observational constraints.