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🪨 Rock changes 🪐 Normal movement 🏖️ Building outward
prograde

prograde

9.2
Rock changing as it is buried and becomes hotter and under more pressure
  • adjective
  • /ˈproʊɡreɪd/
  • Specialized
translation icon : progresivo
  • During prograde changes, rocks are buried deeper and exposed to higher temperatures.

Examples

  • During prograde metamorphism, minerals change their structure.

  • The prograde metamorphism of the rock resulted in the formation of new minerals.

  • Scientists studied the prograde sequence to understand the region's geological history.

  • The prograde metamorphism of the rock was evident.

  • During prograde changes, the increasing pressure and heat altered the minerals within the rock.

  • Geologists identified the prograde metamorphic processes that contributed to the rock's transformation over time.

  • The prograde development of the rock layers showed how they responded to heat and pressure during burial.

Antonyms

retrograde
1 7.8

Becoming worse and returning to an earlier state

Surface Forms

prograde positive

Morphology

prograde = grade (semi-transparent) = pro + grade

The term literally signals movement toward a higher 'grade' (pro- + grade), but the usage is technical (metamorphic grade) and requires domain knowledge.

Etymology

Prograde comes from the parts pro- 'forward' and grad 'step', the same root found in grade and graduate. So when rocks change as they are buried and see more heat and pressure, they are taking 'forward steps' through higher conditions, which is why geologists call those changes 'prograde'.