Abstract

As part of the long‐term carbon cycle, carbonaceous vapor is generated by metamorphism of carbonate rocks and organic‐rich sediments during burial in the crust, and by partial melting associated with subduction in the mantle. This vapor percolates through fracture systems in the crust, leaves traces in microfractures, and sometimes concentrates as graphite in fault zones. To explore the many‐faceted problem of carbon distribution and detection in rocks and its influence on electrical conductivity, 40 petrologists and geophysicists from Europe and North America recently convened for an interdisciplinary workshop. The program featured prepared lectures and informal presentations, but was kept fluid and emphasized extended discussion.

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