(L07)Igneous_Processes_and_Structures_E10

(L07)Igneous_Processes_and_Structures_E10 - Igneous...

Info iconThis preview shows pages 1–16. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Igneous Processes and Structures GLY 2010 – Summer 2010 Lecture 7
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Definition of Igneous Igneous - Said of a rock or mineral that solidified from molten or partly molten material, i.e. from a magma Etymology: Latin ignis , ''fire”
Background image of page 2
3 Magma Magma is naturally occurring mobile rock material “molten rock” Capable of intrusion and extrusion Igneous rocks are derived from magma through solidification and related processes
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 Viscosity Viscosity is the property of a substance to offer internal resistance to flow; its internal friction
Background image of page 4
5 Flow Viscosity Initial Position After flow starts Viscosity increases from left to right
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
6 Viscosity in Magma Video shows a rod being poked in hot, viscous magma on Kilauea, Hawaii
Background image of page 6
7 Factors Influencing the Viscosity of Magma Temperature Chemical composition Gas content
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
8 Temperature The higher the temperature, the lower the viscosity Basaltic magmas at 1200°C or higher, are much more fluid (less viscous) than granitic magmas at 800°C
Background image of page 8
9 Low Viscosity Flow Animation Typical of basaltic magma
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
10 High Viscosity Flow Animation Typical of Andesitic or Rhyolitic Magmas
Background image of page 10
11 Chemical Composition The higher the silica content of magma, the higher the viscosity
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
12 Gas Content As gas content increases, the viscosity decreases Gases inhibit silica chain formation, and lower overall viscosity
Background image of page 12
13 Effects of Increasing Viscosity Volcanic violence related to viscosity (magma type) Magma type related to geologic, and often, plate tectonic setting
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
14 Partial Melting Different minerals melt at different temperatures As temperature increases, this leads to partial melting
Background image of page 14
Igneous Structures Intrusive magma freezes below the surface Extrusive magma erupts onto or above the surface 15
Background image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 16
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 56

(L07)Igneous_Processes_and_Structures_E10 - Igneous...

This preview shows document pages 1 - 16. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online