Schematic cross section relationships of intrusive
and country rocks.
Here are schematically depicted relationships between an
intrusive body (the red rock) and surrounding sedimentary 'country' rocks.
- A -> shales (fine grained sedimentary rock).
- B -> limestones (marine sedimentary rock).
- C-> altered rock A and B adjacent to the intrusion,
recrystallized with new minerals that grow at higher temperatures.
- D -> the main body of the intrusive rock (a stock,
pluton or batholith).
- E -> xenolith, a piece of surrounding rock embedded
within the intrusive rock.
- F -> a dike, a discordant tabular (sheet-like) intrusion.
- G -> a sill, a concordant tabular intrusion.
What do these relationships indicate about the initial
physical state of the red rock when it formed?
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