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(Fig. 1), the capital of the Dominican Republic, West Indies, was studied as a part of the "Cordillera Central Project" of Mitsubishi Metal Corporation, conducted by Misao Watanabe, one of the writers, from 1965 to 1970 (Watanabe et al., 1972). In order to outline a possible copper mineralized zone which had been suggested by stream sediment anomalies found in the Arroyo Ancho mid-stream, a tributary of the Rio Guanajuma, the area was mapped in detail and soil-sampled. The results revealed some remarkable anomalies which were later tested by diamond drilling. While those anomalies were mostly restrict ed to meta-diabase, the mineralization delineated by the drilling was too shallow in depth to warrant further study. It was decided eventually that the area be abandoned. Aside from this, the meta-diabase aforementioned, usually altered to a green rock, is well characterized by large amounts of iron-titanium oxide minerals and small amounts of sulfide minerals. The present study presents, in addition Fig. 1. Location map of the Rio Guanajuma area, Cordillera Central, Dominican Republic.

Iron-titanium oxide-rich meta-diabase from the Rio Guanajuma area, Cordillera central, Dominican republic.