Abstract
The magnetite iron ores of Chien-p'ing, Hopei, China occur in hornblende-plagioclase granulite and impure marble of the Archean Sang-kan system. The stratigraphic sequence of the region includes Archean, Proterozoic Sinian system, Cambrian, Ordovician, and Quaternary deposits. The ores are deep-seated, high-grade metamorphic deposits formed partly by hydrothermal action. Significant minerals of the ores are pyroxene, hornblende, magnetite, and brucite. -- M. Russell.
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