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Favourable condition for the formation of porphyry copper deposits is : 1. Extremely low oxygen fugacity in initial magma 2. High water content in initial magma 3. Crystallization of magama at deep crustal level 4. Crystallization of magama at earth's surface

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  • 2
    $\begingroup$ Looks like an exam question... $\endgroup$ – Jean-Marie Prival Feb 26 at 15:19
  • $\begingroup$ Yes, saw it in a question paper. Only one answer is correct $\endgroup$ – Diksha Feb 26 at 15:35
  • $\begingroup$ Exam questions are better received if you show what you have tried to answer the question yourself. $\endgroup$ – gerrit Feb 27 at 8:18

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