Abstract

All the previous theories, including hydrothermal solutions of magmatic origin; submarine mud volcanoes; hot springs; supergene enrichment; lateral secretion, on the genesis of the copper deposits of "manto" type in the Lower California, Mexico, lack supporting evidence. They do not accord with field observations, which in many respects suggest that the copper was transported in solution from surrounding highs into the Pliocene seas and deposited with the sediments in the shallow waters or near the shore.

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