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Insular and submarine ferromanganese mineralization of the Tonga-Lau region

Marine Mining

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Abstract

Ferromanganese oxides in the Tonga-Lau region are divided into crusts and stratabound deposits. Crusts were collected from the Tonga and Lau Ridges and have Fe/Mn ratios greater than 1, and an average Co content of 0.25%. The crusts average less than 10 mm thick with a maximum of 50 mm, and growth rates of tens of millimeters per million years. The thickest crust is probably less than a million years old. Crusts formed by both hydrogenetic and hydrothermal precipitation, with the hydrothermal input averaging 76%. Stratabound deposits are divided into three types. The source rocks through which the circulating fluids passed controlled the dominant minor element compositions of the stratabound deposits from each area: Valu Fa Ridge, Mo; Tonga Ridge Ti; Tonumea, Sr and Eua, V. -from Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Insular and submarine ferromanganese mineralization of the Tonga-Lau region
Series title:
Marine Mining
Volume
9
Issue:
3
Year Published:
1990
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Marine Mining
First page:
305
Last page:
354