Metamoprhic reactions 22`

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What is the fundamental principle of metamorphic rocks?

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Geology

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1

What is the fundamental principle of metamorphic rocks?

The mineral assemblages reflect the physical P-T conditions all the time when the rock formed

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2

How to get a rock in equilibrium

long enough exposure to the same specific P-T conditions, and the rock will assemble into the most stable conditions possible

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3

What is the most stable mineral composition?

The state with the lowest gibbs free energy

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4

What is a petrogenetic grid used for?

Bulk composition of a constant

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5

What is the value of a P-T grid

The actual range of physical conditions under which specific assemblages are stable relative to others

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6

Compositional phase diagrams

Constructed for a specific value of P + T

  • only phases connected by Tie lines can exist

  • The system will usually crystallize as a 3 phase system according to the triangular field

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7

What happens if a mineral is not directly connected by tie line?

It cannot stably co-exist

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8

What happens when two minerals react together?

The tie line that connects them is removed

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9

what happens when 2 minerals grow together for the first time?

a new tie line connects them together

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10

What is serpentinite?

Hydrated ultramafic rock, common in mountain belts.

  • They represent the metamorphosed ocean floor or upper mantle rocks that have been thrust upwards during the orogenic process

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11

Antigorite= Forsterite + talc+ h2O reaction

As we get closer to the pluton, the T of metamorphism is increasing. Antigorite has dehydrated and reached its high-T stability limit to form Fo+ TC+h2O

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12

crossing tie line reaction

A crossing tie line reaction occurs when a rock crosses from one tie line to another as the conditions change during metamorphism.

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