Systematic variations of trace element and sulfur isotope compositions in pyrite with stratigraphic depth in the Skouriotissa volcanic-hosted massive sulfide deposit, Troodos ophiolite, Cyprus
作者： Manuel Keith , Karsten M. Haase , Reiner Klemd , Stefan Krumm , Harald Strauss
DOI: 10.1016/J.CHEMGEO.2015.12.012
关键词:
摘要: The Troodos ophiolite represents one of the best-preserved fossil analogs modern oceanic crust and includes numerous volcanic-hosted massive sulfide deposits. Skouriotissa deposit can be separated into a stockwork ore zone an overlying lens that is covered by metalliferous sediments representing former sulfide–seawater interface. Pyrite dominant mineral within these ores. trace element composition pyrite varies systematically with stratigraphic depth (down to ~ 150 mbsf) probably reflecting fluid temperature variations effects phase separation (Co, Ni, Se, Te, Bi Cu). Metal remobilization due hydrothermal refining (Zn, Sb Pb) fluid-seawater mixing at seafloor (Mo) represent further important processes controlling chemistry. Massive sulfide-hosted sphalerite euhedral formed from hot fluids (~ 400 °C), while occurrence colloform indicates lower precipitation temperatures (< 400 °C). Similar δ18O quartz-fluid equilibration (~ 400 °C) in suggest did not cool significantly during final 150 m ascent seafloor. δ34S deep (− 1.4‰) suggests isotopically light magmatic volatile (< 0‰) was added system Skouriotissa. During about 38% Cretaceous seawater (δ34S = 18–19‰) leading positive values (6.1‰). In addition, chemical textural similarities between vent systems deposits has analog.
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