Geometry of sheath folds and related fabrics at the Luikonlahti mine,Svecokarelides, eastern Finland |
| |
| Institution: | 1. 3D Seismic Lab, School of Earth and Ocean Sciences, Cardiff University, Main Building, Park Place, CF10 3AT Cardiff, United Kingdom;2. Departamento de Geologia, and Instituto Dom Luiz Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal;3. Department of Geology and Geophysics, University of Hawaii, 1680 East-West Rd., Honolulu, HI 96822, United States |
| |
| Abstract: | The Luikonlahti Cu-Co-Zn sulphide ore deposit is hosted by metasediments associated with serpentinites in the 1.97 Ga old Outokumpu assemblage in the Svecokarelides of eastern Finland. Polyphase deformation of the host rocks, a history shared by the ore body, includes a phase of sheath fold propagation. A modified vergence rule, utilizing only the intersection geometry of planar fabric elements, permits recognition of these extremely curvilinear folds in poorly exposed terrain. The detailed geometry of these rocks is independently resolved from borehole and underground stope records. Sheath fold propagation occurred during D2, the second phase of regional deformation. In the Kaavi district D2 major structures are either thrusts or thrust-related. The Luikonlahti sheaths are located in a steeply dipping shear zone formed during this deformation episode. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
