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Footwall mineralization during L ate M iocene extension along the W est C ycladic D etachment S ystem, L avrion, G reece
Author(s) -
Berger Alexandra,
Schneider David A.,
Grasemann Bernhard,
Stockli Daniel
Publication year - 2013
Publication title -
terra nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.353
H-Index - 89
eISSN - 1365-3121
pISSN - 0954-4879
DOI - 10.1111/ter.12016
Subject(s) - geology , mineralization (soil science) , hydrothermal circulation , geochemistry , carbonate , upper crust , zircon , mineralogy , crust , seismology , chemistry , soil science , soil water , organic chemistry
The W est C ycladic D etachment S ystem ( WCDS ) has been mapped from the western C ycladic islands to L avrion (mainland G reece), where several top‐to‐ SSW low‐angle normal faults at different structural levels are observed. Near the detachment horizon, hydrothermal fluid flow originating from M iocene intrusions lead to high‐temperature carbonate strata‐bound Pb–Ag–Zn ore deposits. Zircon (U–Th)/He cooling ages from the mineralized footwall are 7.1 ± 0.6 to 7.9 ± 0.6 Ma. Carbon‐ and O‐isotope analyses of the carbonate host indicate high water‐to‐rock ratios during brittle deformation‐induced metasomatism, and that this interaction, unrelated to proximity of the intrusions, plays the dominant role in the mineralization. The L ate M iocene geology of L avrion is strikingly similar to S erifos island on the SE termination of the WCDS , both characterized by strong localization of detachment faulting and the interaction of brittle deformation with the injection of fluids related to granitoid intrusions.