Available online
Description
The programme continues from T.V.3 with the case study of the continental crust beneath Scotland. A combination of geophysical measurements and observations of rocks found at the surface, build up ...a picture of the three main layers of crust down to the mantle.
The programme continues from T.V.3 with the case study of the continental crust beneath Scotland. A combination of geophysical measurements and observations of rocks found at the surface, build up ...a picture of the three main layers of crust down to the mantle.
| Module code and title: | S237, "The Earth, structure, composition and evolution" |
|---|---|
| Item code: | S237; 04 |
| First transmission date: | 11-04-1981 |
| Published: | 1981 |
| Rights Statement: | |
| Restrictions on use: | |
| Duration: | 00:24:00 |
| + Show more... | |
| Producer: | Barrie Whatley |
| Contributors: | Stephen Drury; Sandie Smith |
| Publisher: | BBC Open University |
| Keyword(s): | Caledonian; Gneiss; Gravity anomaly; Heat producing elements; Lewisian; Metamorphic; Potassium; Reflection seismic; Thorium; Uranium |
| Footage description: | Sandy Smith with the sectional model of Scotland seen in the previous programme, introduces the programme. Sandy Smith goes on to suggest that Lewisian rocks are promising candates for the 6.4 km/s layer which underlies the Caledonian layer. She outlines, briefly, a seismic method, seismic reflection, which is used to gather data to support this proposition. Shots of seismic reflection profile. Shots of the Loch Assynt area. Steve Drury looks at the rocks at several sites at this location. He points out the boundary layer between the Caledonian and the older rocks below and then examines samples of the rocks listing their mineral content. Drury identifies them as Lewisian. Sandy Smith briefly summarises the programme so far. Shots of the sectional Scotland model as she talks. Shots of Steve Drury in the Cairngorms. He examines some granite samples and points out their mineral content as well as crystalline structure. Sandy Smith, with the aid of models and gravity anomaly maps, explains how the extent of the Cairngorm granites beneath the surface was determined. Shots of Elie on the northern shore of the Firth of Forth. Steve Drury looks at samples of the thin, low velocity sedimentary layer from this Midland valley. More shots of the Scotland sectional model. Sandy Smith summarises the programme so far. Steve Drury examines some of the volcanic debris left on the surface at Elie. He explains that these provide information on the deepest (7 KM/sec) crustal layer and the peridotite upper mantle beneath Scotland. Sandy Smith summarises the programme. |
| Production number: | FOUS162L |
| Videofinder number: | 1591 |
| Available to public: | no |
