North Pole Dome from vehicle

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North Pole Dome from vehicle

This is a transcript of a QuickTime movie (7.0 MB) recorded in the Pilbara in 2005. Dr Martin Van Kranendonk, a geologist with the Geological Survey of Western Australia, describes the geology of the North Pole Dome from the vehicle.


So we are just starting to get into North Pole dome now. We drive through these hills. This is a great area too. This is a big felsic volcano that’s turned on its side so you see the whole cross section. You can see the core of the volcano which is a big fracture and there are old fumeroles that are preserved there and a ring of banded iron formation which is a hydrothermal exhalative and then there are the eruptive products of each volcanic succession. You get about nine eruptive cycles all with basal surges, cross bedded basal surges. And they are right in an area where there is really coarse volcanic blocky texture. It’s unsorted and stuff. But you get big blocks of pumice and you get, you know, lots of typical volcanic rocks. And then right in the middle of it there is a structure just made up of very fine grained material but it’s just got these circular patterns in it and stuff and it’s not weathering but its just sitting there, must have been a steep hill.

So what is the material that fills it?

It’s just felsic volcanic material. These are all volcanic flows through here. They are going across the road at the moment. You get these from up here. This is basically the bottom and as you go across here right up section there are nine volcanic flows or eruptive events, not flows.




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