Editing Glen Bay Gabbro - St. Kilda: an illustrated account of the geology

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Chemically, the Glen Bay Gabbro is richer in TiO<sub>2</sub>, K<sub>2</sub>O, P<sub>2</sub>O<sub>5</sub> and rare earth elements than are earlier gabbros and dolerites on St Kilda (E<sup>''W''</sup>, D and EK), and it almost certainly has a different source. It marks a separate stage in the evolution of the St Kilda volcanic centre and may represent part of a magma chamber developed at a relatively high level in the earth's crust. One way of explaining the unusually thick chilled margin of the Gabbro is by postulating that a large block or segment of cold gabbro-dolerite breccia (EK) collapsed into such a magma chamber, following perhaps a particularly violent surface eruption.
 
Chemically, the Glen Bay Gabbro is richer in TiO<sub>2</sub>, K<sub>2</sub>O, P<sub>2</sub>O<sub>5</sub> and rare earth elements than are earlier gabbros and dolerites on St Kilda (E<sup>''W''</sup>, D and EK), and it almost certainly has a different source. It marks a separate stage in the evolution of the St Kilda volcanic centre and may represent part of a magma chamber developed at a relatively high level in the earth's crust. One way of explaining the unusually thick chilled margin of the Gabbro is by postulating that a large block or segment of cold gabbro-dolerite breccia (EK) collapsed into such a magma chamber, following perhaps a particularly violent surface eruption.
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| colspan="6" | * Analyses by members of BGS Analytical Chemistry Unit,
 
| colspan="6" | * Analyses by members of BGS Analytical Chemistry Unit,
 
* Laboratory of the Government Chemist, and R. R. Harding
 
* Laboratory of the Government Chemist, and R. R. Harding
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== [[St. Kilda: an illustrated account of the geology#References|References]] ==
 
== [[St. Kilda: an illustrated account of the geology#References|References]] ==
 
{{EGwalks}}
 
{{EGwalks}}
 
[[Category: 2. Northern Highlands]]
 
[[Category: 2. Northern Highlands]]

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