Delineating ophiolite-derived host rocks of massive sulfide Cu-Co-Zn deposits with 2D high-resolution seismic reflection data in Outokumpu, Finland

• DOI: 10.1190/geo2012-0029.1
• Publication Date: 2012-09-07T22:25:05Z
• Authors: I. T. Kukkonen; S. Heinonen; P. Heikkinen; P. Sorjonen-Ward
• Keywords: Ultramafic rock; Seismic vibrator; Reflection; Prospectivity mapping

Seismic reflection data was applied to a study of the upper crustal structures in Outokumpu mining and exploration area eastern Finland. The Cu-Co-Zn sulfide ore deposits are hosted by Palaeoproterozoic ophiolite-derived altered ultrabasic rocks (serpentinite, skarn rock, quartz rock) black schist within turbiditic mica schist. Mining has produced total 36 Mt from three historical one active mine. comprises 2D vibroseis surveyed along network local roads. seismic sections provide comprehensive 3D view reflective structures. Acoustic rock properties downhole logging synthetic seismograms indicate that strongly packages shown can be identified as host-rock environments deposits. Reflectors show excellent continuity structural grain belt, which allows correlating reflectors with surface geology, magnetic map, drilling into broad model belt. Massive ores have acoustic make them directly detectable methods assuming deposit size is sufficient for wavelengths. revealed numerous interesting high-amplitude interpreted suites potentially coinciding sulfides.