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  1. Geometry of Silicic Dikes Beneath the Inyo Domes, California

    Structural geologic evidence in the vicinity of the Inyo Domes indicates that the youngest extrusive products were erupted from a silicic dike that divided into at least three segments which underwent up to...

  2. Shapes of Venusian "Pancake" Domes Imply Episodic Emplacement and Silicic Composition

    The main evidence available for constraining the composition of the large circular "pancake" domes on Venus is their gross morphology. Laboratory simulations using polyethylene glycol show that the height to...

  3. Quantification of Extraterrestrial Lava Flow Effusion Rates Through Laboratory Simulations

    We have used carefully controlled laboratory simulations to develop a model which relates lava flow morphology to effusion rate and rheology. Through comparisons with measured and estimated eruption rates on...

  4. Lava and Ice Interaction at Stratovolcanoes: Use of Characteristic Features to Determine Past Glacial Extents and Future...

    Structures resulting from lava and ice interaction are common at glaciated stratovolcanoes. During summit eruptions at stratovolcanoes, meltwater is produced and travels freely down steep slopes and thin...

  5. Igneous Dikes at Long Valley, CA: Emplacement Mechanisms and Associated Geologic Structures

    Two hypotheses for dike emplacement are: (1) magma flows into and dilates pre-existing fractures; or (2) magma flows into and dilates self-generated fractures. In the first case dikes should be parallel to an...

  6. Rheologic Properties and Kinematics of Emplacement of the Chaos Jumbles Rockfall Avalanche, Lassen Volcanic National Park,...

    The Chaos Jumbles is a rockfall avalanche deposit that was emplaced by three separate events ~ 300 years ago. Deposits from each event are distinguishable on the basis of morphology, size variation of large...

  7. The Mechanism of Intrusion of the Inyo Dike, Long Valley Caldera, California

    We analyze the intrusion of the 11-km-long lnyo Dike at the margins of Long Valley caldera, eastern California. The dike trends N07°W and is divided into at least three segments which are rotated by as much as...

  8. Textural Constraints on Effusive Silicic Volcanism: Beyond the Permeable Foam Model

    Transitions between explosive and effusive phases of silicic volcanic eruptions have been related either to stratification of volatiles in the source magma body or to the loss of volatiles through the permeable...

  9. The Morphology of Lava Flows in Planetary Environments: Predictions From Analog Experiments

    The rates of surface cooling and lateral spreading are evaluated for lava flows on the surface of Earth, Venus, Mars, the Moon, and 10. Differences between the flow morphologies expected in these environments...

  10. Morphology, Eruption Rates, and Rheology of Lava Domes: Insights from Laboratory Models

    The growth of lava domes can be either quiescent or violent, with transitions between styles of behavior commonly occurring with little warning. Here we propose that the behavior depends on the eruption rate,...

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