Metal-depleted root zones of the Troodos ore-forming hydrothermal systems, Cyprus

Details Metal-depleted root zones of the Troodos ore-forming hydrothermal systems, Cyprus Metal-depleted root zones of the Troodos ore-forming hydrothermal systems, Cyprus

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..84..243r&link_type=abstract

Earth and Planetary Science Letters, Volume 84, Issue 2-3, p. 243-253.

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47

Scientific paper

The cupriferous pyrite deposits of Cyprus were precipitated from hydrothermal solutions derived by interaction of contemporaneous seawater with hot mafic rock at the ancient Troodos spreading centre. Here we identify the zones in which this interaction took place. The zones occur in the lower part of the sheeted dyke complex, and within them 30-50% of the rock is made up of epidosite, an epidote-quartz rock, replacing the dykes as sheets and pipes. The epidosites contain abundant fluid inclusions, which give trapping temperatures of 350-400°C or even higher, and contain water normally near seawater in salinity. Zones of epidosite are elongate parallel to the strike of the sheeted dykes, and are up to 1 km wide. The rocks throughout these zones are strongly depleted in Cu and Zn, and the metals removed are sufficient to supply the ore deposits. In fact several large ore deposits lie along strike from zones of epidosite. All of these features support the identification of the epidosites as the hydrothermal reaction zones.
The location of the epidosite zones immediately above the gabbros of the plutonic complex supports the hypothesis that the heat to drive the ore-forming systems came from the underlying magma, as is also likely for modern black smoker springs.

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