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Igneous

VMS Deposits on Cyprus

Ophiolite-hosted VHMS (Volcanic-Hosted Massive Sulphide) deposits, also known as Cyprus-type VHMS deposits, are seen in at least 25 of the worlds more than 200 known ophiolite terranes. The term Cyprus-type should now be considered a bit of a misnomer, as the Troodos ophiolite - to which the Cyprus-type name refers - is not a typical Mid-ocean ridge ophiolite - indeed it is considered to be a supra-subduction zone ophiolite, similar to the present day Mariana-Bonin arc.

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Introduction to Igneous Petrology

Igneous rocks are formed form the cooling of molten rock, magma. They are crystalline, which means they are made up of crystals joined together. There are many different types of igneous rocks but they fall into two (very) broad categories; intrusive and extrusive. Intrusive rocks are igneous rocks which form at depth. They cool slowly, taking tens of thousand of years to cool. They have large crystals, tens of millimetres in size. Extrusive rocks are those which have erupted from volcanoes.

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