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Manganese carbonate mineralization in the Molango district, Mexico

Economic Geology

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Abstract

Mn carbonate mineralization is hosted by a finely laminated Upper Jurassic marine sedimentary sequence that forms the base of the Chipoco facies of the Taman Formation (Kimmeridgian). The carbonate ore bed consists of fine-grained rhodochrosite and dispersed organic matter, magnetite, and maghemite but generally only trace quantities of pyrite. Fine laminations and clotted textures suggest deposition in a restricted marine environment. Several geologic and geochemical processes resulted in the formation of Mn carbonate by the early diagenetic reduction of Mn oxides through the oxidation of organic matter and iron sulfide. The ultimate source of the manganese is uncertain but may have been fluvial-sediment loads or hydrothermal activity associated with the rifting of the Gulf of Mexico. -from Author

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Manganese carbonate mineralization in the Molango district, Mexico
Series title:
Economic Geology
Volume
87
Issue:
5
Year Published:
1992
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Economic Geology
First page:
1345
Last page:
1366
Number of Pages:
22