Asteroid (162173) Ryugu was the first spinning-top-shaped asteroid to be closely approached by a probe, Hayabusa2 spacecraft, which sent numerous high-resolution images of Earth and revealed nature this type asteroid. One notable features is equatorial ridge, considered result rapid spin in past. Despite advanced age indicated presence craters, ridge exhibits bluish color, indicating that it co...

Lava dome collapse hazards are intimately linked with their morphology and internal structure. We present new lava emplacement models that use calibrated rock strengths allow material behaviour to be simulated for three distinct units: (1) a ductile, fluid core; (2) solid upper carapace; (3) disaggregated talus slopes. first show relative proportions of depend on strength, piles can act as an u...

The initial ratios of neodymium-143 to neodymium-144 in kimberlites ranging in age between 90 x 10(6) to 1300 x 10(6) years from South Africa, India, and the United States are different from the corresponding ratios in the minerals of peridotite inclusions in the kimberlites but are identical to the ratios in the basaltic achondrite Juvinas at the times of emplacement of the respective kimberli...

Introduction: For many years, the nature of emplacement of large ‘flat-topped’ sheet flows on Mars has puzzled planetary scientists. Large terrestrial basaltic a’a flows may extend for tens of km and tend to exhibit significant viscosity increases (up to several orders of magnitude) along the path of the flow due to incipient cooling and crystallization. The change in viscosity usually causes a...

Introduction: Lava flow surface morphology results from processes that occur during emplacement. Features such as tumuli and lava rises are indicators of flow inflation [1]. Tumuli in particular have been identified as possible indicators of lava tube location [2-5], indicating that their distribution on the surface of a lava flow is a function of the internal pathways of lava present during fl...

This Special Publication provides a snapshot of our understanding of volcanic processes through the use of palaeomagnetic and rock magnetic techniques. Here, we provide a context for the book, placing individual chapters within the milieu of previous work, including some magnetic techniques that were not used in the particular studies described herein. Thermoremanent magnetization is a powerful...

Introduction: High albedo features in Valles Marineris (VM) were first identified in Mariner 9 data and ever since there has been a continuous source of debate concerning their emplacement and evolution. Tithonium Chasma (TC) system on Mars is the westernmost part of Valles Marineris (VM) that present light toned outcrops (LTO) in ambiguous relationship with plain material that cuts through. Wh...

Detailed geologic mapping of approximately 30% of the surface of Venus has revealed a stratigraphic sequence that appears to be repeated in widely separated areas on the planet. This sequence shows a transition from oldest highly deformed terrain units, the tessera, to a series of widespread volcanic plains units, each with recognizable morphologic characteristics and interpreted eruption style...