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

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doi: 10.1016/0012-821X(87)90142-7
Authors:Robinson, M. A.; McClelland, Elizabeth A.
Author Affiliations:Primary:
Univ. Leeds, Dep. Earth Sci., Leeds, United Kingdom
Volume Title:Earth and Planetary Science Letters
Source:Earth and Planetary Science Letters, 85(4), p.473-487. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X
Publication Date:1987
Note:In English. 31 refs.; illus. incl. 4 tables, geol. sketch map
Summary:The Tertiary central intrusive of Rhum was emplaced into the Torridonian sandstone, causing a heat influx into the sediment. Detailed progressive demagnetization of sandstones from the thermal aureole of the intrusion show that they reached maximum T which decreased systematically with distance in a manner indicative of conduction-dominated cooling. T 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 hematite, often both occurring in the same specimen. It is suspected that only magnetite carries a truly primary (detrital?) remanance; the hematite probably formed diagenetically (largely by oxidation of detrital magnetite) at some time shortly after deposition. (Authors' abstract) [J.M.H.]
Subjects:Cenozoic; Genesis; Intrusions; Layered intrusions; Neoproterozoic; Paleomagnetism; Precambrian; Proterozoic; Stratigraphy; Tertiary; Torridonian; Upper Precambrian; Europe; Great Britain; Hebrides; Highland region Scotland; Inner Hebrides; Inverness-shire Scotland; Rhum; Scotland; United Kingdom; Western Europe
Abstract Numbers:88M/4785
Record ID:1988007337
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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