St. Martin's
| St. Martin's | ||
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| Waters | Celtic sea | |
| Archipelago | Isles of Scilly | |
| Geographical location | 49 ° 58 ′ N , 6 ° 17 ′ W | |
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| surface | 2.37 square kilometers | |
| Residents | 136 | |
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The island of St. Martin’s ( Cornish Brechiek ) is part of the Isles of Scilly in Cornwall , Great Britain .
description
Of the populated islands of the Isles of Scilly, St. Martin's is the furthest north. The island's population of 136 (2011) inhabited a total of three settlements: Lower Town , Middle Town and Higher Town . There are also some isolated farms and country houses. St. Martin's also has accommodations for tourists with its hotel and campsite. The climate is mild enough to allow wine to be grown . White Island , upstream to the north, can be reached via a tombolo at low tide .
geology
St. Martin's is built from coarse-grained granite from the Isles of Scilly Pluton ( G 1a granite). Two facies can be distinguished. In the northern part of the island, for example, there is a richly porphyry facies , the phenocrystals of which are adjusted in a north-east-south-west direction. In the facies of the southern section, only a few phenocrystals can be seen, but their grain sizes can vary greatly between 1 and 4 centimeters, but the majority are between 1 and 2 centimeters. The northern facies also contain smaller bodies and inclusions of little porphyry granite and occasionally fine-grain granite ( G 1c ). The latter are rounded, elongated in shape and reach 20 centimeters in length. The little porphyry inclusions have an irregular shape and therefore suggest that the two magmas coexisted next to each other. One of these smaller bodies is e.g. B. open between Great Bay and Wine Cove along the north coast.
Web links
Individual evidence
- ^ SJL Mullis, S. Salmon and T. Powell: Insights into the formation of the Isles of Scilly pluton . In: Geoscience in south-west England . tape 10 , 2001.