Criteria for Recognit
Criteria for Recognit
Criteria for Recognit
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Rifting and Extension - CriticalVMS deposits <strong>for</strong>m during episodic rifting ofoceanic and continental volcanic arcs, <strong>for</strong>earcs and in back-arc extensional regimesLong lived extension - crustal thinning– rifting– high heat flow- and extensive verticalpermeability (faults) are key to developingand sustaining ore <strong>for</strong>ming VMShydrothermal systems – must be at shallowcrustal level (>10Km)Return to compressive environment results inuplift, a return to arc volcanism and potentialto <strong>for</strong>m Epithermal and or Porphyry depositsSuperposition of ore deposit types andvolcanic products….(Allen et al., 2002)