WEBVTT
Kind: captions
Language: en

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We're in the New

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England Seamount Chain, and today

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we're exploring a seamount called

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Gosnold.

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When we landed on this dive,

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we actually landed on a manganese

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nodule field.

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We're going over

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this incredible debris field coated

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in ferromanganese, and instead of growing
in one stratigraphic direction like crusts

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on rock surfaces and rock outcrops, manganese
nodules actually form around a nucleus and

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grow outward radially and form concentric
layers, kind of like tree rings.

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For this expedition, because we're looking
at seamounts, I'll be looking at the ferromanganese

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crusts.

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We'll get to see what kind of seawater chemistry
they've recorded over their growth histories.

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So ferromanganese crusts grow layer by layer,
about a millimeter per million years.

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When you go back in time through the rock,
you can see the seawater chemistry being recorded

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in those ferromanganese crusts.

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You can also look at the metal enrichments
to see if there's anything that might be of

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interest in terms of resource potential.

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So there's just several different aspects
of ferromanganese crusts that are really interesting.

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I think the key ingredient here is the available
of material on top of sediments that is allowing

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nodules to grow in this region, which is definitely
an unexpected setting that we've landed here

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today.