Development of a brine-dominated hydrothermal system at temperatures of 400-500°C in the upper level plutonic sequence, Troodos ophiolite, Cyprus

Details Development of a brine-dominated hydrothermal system at temperatures of 400-500°C in the upper level plutonic sequence, Troodos ophiolite, Cyprus Development of a brine-dominated hydrothermal system at temperatures of 400-500°C in the upper level plutonic sequence, Troodos ophiolite, Cyprus

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54..653k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 54, Issue 3, pp.653-661

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Microthermometric analyses of quartz-hosted fluid inclusions in fresh and epidotized plagiogranites from the Troodos ophiolite, Cyprus, indicate that brine-rich fluids (46-56 wt% NaCl equivalent) at temperatures >400-500°C were pervasive throughout many of the plagiogranite bodies. High-salinity, Fe-bearing inclusions along healed microfractures homogenize by halite dissolution at temperatures of 400-500°C. Liquid-dominated, low-salinity (2-7 wt% NaCl) secondary fluid inclusions are ubiquitous in all plagiogranite and gabbro samples studied. Homogenization of the low-salinity inclusions occurs at uncorrected temperatures of 200-400°C. The quartz-hosted, high-salinity fluids represent either phase separation of hydrothermal seawater or an exsolved magmatic aqueous phase at uncorrected temperatures of 400-500°C. Migration and segregation of brine and vapor phases into fractures near the margins of the crystallizing plagiogranite bodies resulted in preferential entrapment of the Fe-rich brines in the deep-seated, high-temperature portions of the hydrothermal system. Subsequent fracturing of the upper plutonic rocks at temperatures of 200-400°C allowed penetration by seawater, which pervasively altered the plagiogranites. Hydration reactions involving formation of secondary minerals and/or mixing with phase-separated fluids resulted in fluid salinities two times that of seawater.

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