Rheology

Question 1

Rheology of the lithosphere

Answer 1

depth ->increasing t and p
-> rock strength increases

with increasing depth:
brittle, brittle-ductile transition, ductile

Question 2

Homologous temperature

Answer 2

ratio of material temperature to melting temperature

uses melting temperature as the standard to compare different materials
ie if two materials are 50% to the melting temperature, they should behave similarly

-makes it possible to compare deformation of materials with different melting temperature

eg., ice and olivine should behave similarily at TH = 0.95
-> ice at -14ºc (TH=.95) should behave similarly to olivine at 1744ºc (also TH=.95)

Question 3

competence

Answer 3

denote contrast in strength

competent and incompetent are relative to each other

the competent material is able to support a higher deviatoric stress (more difficult to deform) than an incompetent material

eg, quartzite vs shale
-q is competent and s is incompetent

stronger material than q vs q
- stronger material is competent and q is incompetent