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Title: Magmatic, hydrothermal and ore element transfer processes of the southeastern Archean Superior Province implied from electrical resistivity structure

Journal Article · · Gondwana Research
 [1];  [2];  [3];  [4];  [4];  [5];  [6];  [3];  [7]
  1. Laurentian University, Sudbury (Canada); Geological Survey of Canada, Ottawa (Canada); OSTI
  2. Czech Academy of Sciences, Prague (Czech Republic)
  3. Laurentian University, Sudbury (Canada)
  4. University of Utah, Salt Lake City, UT (United States)
  5. Simon Fraser University, Vancouver (Canada)
  6. Geological Survey of Canada, Ottawa (Canada)
  7. Laurentian University, Sudbury (Canada); Geological Survey of Canada, Ottawa (Canada)

Although magmatic- and metamorphic- derived fluids are widely recognized mineralizing agents, the role of crustal architecture in defining source and sink zones within the middle to lower crust and upper mantle of ancient orogens remains enigmatic. The globally largest and best-preserved Archean greenstone belts lie in the Superior Province, Canada. They provide an ideal location to investigate the influence of igneous construction and subsequent syn-deformational plutonism and metamorphism on the localization of metal-rich melts and fluids throughout the crustal column. Integration of three-dimensional magnetotelluric modelling and seismic reflection sections across the Abitibi subprovince reveals details of a 'whole-of-crust' magmatic and hydrothermal system. East-west low resistivity structures broadly underlie the surface traces of the major deformation zones that are host to significant gold endowment (>200 Moz), while mid-crustal cross trends suggest mineralized fluids flowed along 'pipes' within fault planes. Most low resistivity structures are inferred to represent domains containing interconnected zones of graphite and/or sulfide. Furthermore, these delineate relict mantle source/transit domains and crustal pathways enriched by the flow of magmas or metamorphic fluids genetically related to a late-stage pulse of ore-bearing magmatism, possibly as a result of slab break-off or delamination. Using the combined MT and seismic data, we develop a 3-D crustal-scale model which highlights how evolving orogenic architecture-controlled mass transfer and metallogenic processes developed.

Research Organization:
University of Utah, Salt Lake City, UT (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Geothermal Technologies Office
Grant/Contract Number:
EE0002750
OSTI ID:
1977169
Journal Information:
Gondwana Research, Journal Name: Gondwana Research Journal Issue: C Vol. 105; ISSN 1342-937X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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