Greisen is formed by alteration of which rock type?

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Study for the ASBOG 1 Geology Exam. Use flashcards and multiple choice questions for effective preparation. Each question includes hints and detailed explanations for better understanding. Prepare confidently for your exam!

Multiple Choice

Greisen is formed by alteration of which rock type?

Explanation:
Greisen forms when hot, silica-rich hydrothermal fluids interact with granitic rocks, altering feldspar and quartz and creating a quartz-rich, muscovite-bearing rock. This alteration pathway is characteristic of granitic intrusions, especially in tin and related ore environments. Basalt, limestone, and gneiss do not undergo this specific granitic-type alteration to produce greisen, so the rock being altered is granite.

Greisen forms when hot, silica-rich hydrothermal fluids interact with granitic rocks, altering feldspar and quartz and creating a quartz-rich, muscovite-bearing rock. This alteration pathway is characteristic of granitic intrusions, especially in tin and related ore environments. Basalt, limestone, and gneiss do not undergo this specific granitic-type alteration to produce greisen, so the rock being altered is granite.

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