Volcanic processes Magma encounters external water Yes Volcanic
- Slides: 62
Volcanic processes
Magma encounters « external » water Yes Volcanic processes and types No Magma contains dissolved gas Submarine, surtseyan, phreatomagmatic types Yes No Magma is viscous Plinian eruptions « grey » volcanoes More explosive Andesitic Subductions Yes No Domes and block-and-ash flows (Pelean) Flows and scoria cones (Strombolian, hawaian) « red » volcanoes Less explosive Basaltic Intra-plate
• Dynamic types related to magma/water interactions • Dynamic types related to dissolved bubbles • Dynamic types related to domes growth and collapse • Dynamic types related to lava flows etc. • Destruction of volcanic edifices • Complex edifices
Magma viscosity Figure 4 -1. a. Calculated viscosities of anhydrous silicate liquids at one atmosphere pressure, calculated by the method of Bottinga and Weill (1972) by Hess (1989), Origin of Igneous Rocks. Harvard University Press. b. Variation in the viscosity of basalt as it crystallizes (after Murase and Mc. Birney, 1973), Geol. Soc. Amer. Bull. , 84, 3563 -3592. c. Variation in the viscosity of rhyolite at 1000 o. C with increasing H 2 O content (after Shaw, 1965, Amer. J. Sci. , 263, 120 -153).
Mount Saint-Helens: The post-18 May dome
Figure 4 -7. Schematic cross section through a lava dome.
Secondary ash fall (+local surges)
Dome growth and collapse • Cortex of the dome « chills » , interior still hot • Steep slopes, local collapse – Breccias – Pyroclastic flows: « block and ash flow » • Dense flow, rich in blocks • Smaller scale than plinian!!
Montagne-Pelée, Martinique (lesser Antilles)
Saint-Pierre, before
Saint-Pierre, after
Magma encounters « external » water Yes Volcanic processes and types No Magma contains dissolved gas Submarine, surtseyan, phreatomagmatic types Yes No Magma is viscous Plinian eruptions « grey » volcanoes More explosive Andesitic Subductions Yes No Domes and block-and-ash flows (Pelean) Flows and scoria cones (Strombolian, hawaian) « red » volcanoes Less explosive Basaltic Intra-plate
• Dynamic types related to magma/water interactions • Dynamic types related to dissolved bubbles • Dynamic types related to domes growth and collapse • Dynamic types related to lava flows etc. • Destruction of volcanic edifices • Complex edifices
Lava lakes
Eruptive fissures
Bubbles
Scenic volcanoes! Stromboli (Italy)
Scoria cones
Piton de la Fournaise (Réunion, Indian Ocean)
Cones groupe in Réunion
Puy de Pariou (France) (note also the pelean dome of Puy de Dome at the back)
Scoria cones
Disrupted cones
Cones and lava flows
Etna (Italy)
Strange things lava flows do…
No, there is nobody here – it is just a weird but completely natural shape…
Multiple lava flows Piton de la Fournaise (Réunion, Indian Ocean)
Rift zone
Aa and Pahoehoe
Lava caves
Prismation
Scoria base
- I said yes i will yes
- Yes yes lord amen
- Brandon witte
- Water and water and water water
- Yes yes lord amen
- Concurrent processes are processes that
- Mongo seeds will dissolve in one cup water yes or no
- Expansion exploration and encounters
- Christ encounters
- Encounters and foundations to 1800
- Pencounters
- Encounters and foundations to 1800 comprehension answers
- Lenses of literary criticism
- Colonial encounters in asia africa and oceania
- Chapter 22 traditions and encounters
- Transoceanic encounters and global connections
- Chapter 18 colonial encounters in asia and africa
- Close encounters challenges
- Political transformations empires and encounters
- Chapter 5 political transformations empires and encounters
- Traditions and encounters chapter 23
- Chapter 22 transoceanic encounters and global connections
- Traditions and encounters chapter 20
- Chapter 1 three worlds meet
- Chapter 22 transoceanic encounters and global connections
- Transatlantic encounters in history of education download
- External-external trips
- Izlita magma
- Shield volcanoes
- Hardened magma squeezed into vertical spaces between rocks
- Batolit adalah
- Make a concept map on types of rocks
- Magma andesítico
- Neurulazione secondaria
- Igneous rock
- Diversi tipi di magma
- Magma
- Heuchera flores sea
- Magma mixing
- How is magma formed
- Characteristic of magma
- Hot magma rises to the surface
- Magma examples
- Properties of magma
- Magma ocean
- Magma examples
- Magma facts
- Mantle magma
- Lava plateau diagram
- Rochas formadas pelo resfriamento do magma
- Mantle magma
- Rochas formadas pelo resfriamento do magma
- Metamorphic rock defintion
- Plate tectonics test review answer key
- Kontinentalplattor
- Magma primario e secondario zanichelli
- Magma
- Crystallize
- Type of texture
- Igneous rocks
- Serie di bowen zanichelli
- A salt solution weighing 10000 kg with 30 wt
- Opening in the earth's crust where magma occasionally exits