WEBVTT Kind: captions Language: en 00:00:00.399 --> 00:00:01.399 We're in the New 00:00:01.399 --> 00:00:03.000 England Seamount Chain, and today 00:00:03.000 --> 00:00:04.750 we're exploring a seamount called 00:00:04.750 --> 00:00:05.750 Gosnold. 00:00:05.750 --> 00:00:06.750 When we landed on this dive, 00:00:06.750 --> 00:00:08.149 we actually landed on a manganese 00:00:08.149 --> 00:00:10.370 nodule field. 00:00:10.370 --> 00:00:19.440 We're going over 00:00:19.440 --> 00:00:20.760 this incredible debris field coated 00:00:20.760 --> 00:00:25.990 in ferromanganese, and instead of growing in one stratigraphic direction like crusts 00:00:25.990 --> 00:00:31.359 on rock surfaces and rock outcrops, manganese nodules actually form around a nucleus and 00:00:31.359 --> 00:00:41.570 grow outward radially and form concentric layers, kind of like tree rings. 00:00:41.570 --> 00:00:45.480 For this expedition, because we're looking at seamounts, I'll be looking at the ferromanganese 00:00:45.480 --> 00:00:46.480 crusts. 00:00:46.480 --> 00:00:51.550 We'll get to see what kind of seawater chemistry they've recorded over their growth histories. 00:00:51.550 --> 00:00:56.430 So ferromanganese crusts grow layer by layer, about a millimeter per million years. 00:00:56.430 --> 00:01:02.000 When you go back in time through the rock, you can see the seawater chemistry being recorded 00:01:02.000 --> 00:01:03.120 in those ferromanganese crusts. 00:01:03.120 --> 00:01:06.830 You can also look at the metal enrichments to see if there's anything that might be of 00:01:06.830 --> 00:01:08.830 interest in terms of resource potential. 00:01:08.830 --> 00:01:13.010 So there's just several different aspects of ferromanganese crusts that are really interesting. 00:01:13.010 --> 00:01:19.380 I think the key ingredient here is the available of material on top of sediments that is allowing 00:01:19.380 --> 00:01:25.670 nodules to grow in this region, which is definitely an unexpected setting that we've landed here 00:01:25.670 --> 00:01:26.189 today.