Growth Rates and Possible Age of a North Pacific Manganese Nodule
The rate of accumulation of a ferromanganese coating on a fragment of pillow basalt was estimated using a variety of techniques. Unsupported 230Th activity decrease in the oxide layer, K/A dating of the basalt, fission tracks dating of the glassy layer around the basalt, thickness of the palagonitization rind, and integrated 230Th activity give ages from approximately 3 × 106 years to 5 × 103 years.
Data suggest that the ferromanganese material formed rapidly (333 mm/106 years) and by hydrothermal or volcanic processes.
KeywordsFission Track Pillow Lava Manganese Nodule 230Th Activity Oxide Deposit
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