New Developments in the Genesis of the Sudbury Igneous Complex and Associated Ni-Cu-PGE Mineralization
Despite 130 years of very detailed study,many aspects of the generation of the 1850 Ma Sudbury Igneous Complex (SIC) and associated Ni-Cu-PGE ores are not clear.Recent developments include suggestions of 1) oblique impact,explaining how a ≥200 km diameter impact structure could have a melt sheet with a dominantly upper-middle crustal composition,2) larger than appreciated post-impact contributions from locally thermomechanically eroded footwall rocks and mineralization,explaining large heterogeneities in S and Pb isotopes between different ore deposits and parts of the melt sheet,3) reactions between sulfide melts and footwall rocks,providing a mechanism to cross the thermal divide in the Fe-Ni-Cu-S system and generate bornite-millerite-rich ores,and 4) more complicated deformation histories involving multi-directional thrusting of ore bodies during buckling and rotation of the southern contact of the SIC.
C.M.Lesher
Mineral Exploration Research Centre,Department of Earth Sciences,Laurentian University,Sudbury,Ontario P3E 2W8 Canada
国际会议
贵阳
英文
152-155
2012-06-16（万方平台首次上网日期，不代表论文的发表时间）