Palaeomagnetism of the Torridonian of Rhum, Scotland: evidence for limited uplift of the central intrusive complex

Details Palaeomagnetism of the Torridonian of Rhum, Scotland: evidence for limited uplift of the central intrusive complex Palaeomagnetism of the Torridonian of Rhum, Scotland: evidence for limited uplift of the central intrusive complex

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..85..473r&link_type=abstract

Earth and Planetary Science Letters, Volume 85, Issue 4, p. 473-487.

Physics

4

Scientific paper

The Tertiary Central Intrusive of Rhum was emplaced into the Torridonian Sandstone, causing a heat influx into the sediment. Detailed progressive demagnetisation of sandstones from the thermal aureole of the intrusion show that they reached maximum temperatures which decrease systematically with distance in a manner indicative of conduction-dominated cooling. Temperatures reached near to the intrusion are higher than would be predicted theoretically, probably as a result of the presence of smaller plugs of magma at depth which are only rarely exposed at the surface. The shape and magnitude of the thermal aureole suggest that upward movement of the Central Intrusive along the bounding fault was limited.
Primary remanence in Torridonian sandstones unaffected by the intrusion is carried by both magnetite and haematite, often with both occurring in the same specimen. It is suspected that only magnetite carries a truly primary (detrital?) remanence; the haematite probably formed diagenetically (largely by oxidation of detrital magnetite) at some time shortly after deposition.
Now at Department of Earth Sciences, Oxford University, Parks Road, Oxford OX1 3PR, U.K.

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