Age and duration of activity at the Isle of Mull Tertiary igneous centre, Scotland, and confirmation of the existence of subchrons during Anomaly 26r

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doi: 10.1016/S0012-821X(01)00499-X
Authors:Chambers, Lynne M.; Pringle, Malcolm S.
Author Affiliations:Primary:
University of Edinburgh, Department of Geology and Geophysics, Edinburgh, United Kingdom
Scottish Universities Environmental Research Centre, United Kingdom
Volume Title:Earth and Planetary Science Letters
Source:Earth and Planetary Science Letters, 193(3-4), p.333-345. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X
Publication Date:2001
Note:In English. 40 refs.; illus., incl. sects., 1 table, geol. sketch map
Summary:The duration of activity that produced the Isle of Mull Tertiary igneous centre has been constrained to 2.52±0.36 million years (1σ) using new high-resolution 40Ar/39Ar radiometric dating techniques. These new 40Ar/39Ar ages for Mull and also one from Skye, presented here, confine the duration of igneous activity to within one magnetic chron (3 million years within Chron C26r). However, the Mull and Skye Tertiary centres record a sequence of reversed and normal polarity intervals. Recalibration of tie points used to determine the magnetic polarity time scale cannot account for all of the observed changes in polarity from Mull and Skye. We propose that the new ages for the Mull and Skye centres indicate that these parts of the British Tertiary volcanic province developed fast enough to record short-period polarity intervals, which correspond to tiny wiggles in the marine magnetic anomaly record. Abstract Copyright (2001) Elsevier, B.V.
Sections:Age determination
Subjects:Absolute age; Ar/Ar; Cenozoic; Correlation; Dates; Igneous rocks; Isochrons; Lava; Magmatism; Magnetic anomalies; Magnetic inclination; Paleomagnetism; Reversals; Secular variations; Tertiary; Time scales; Volcanic rocks; Argyllshire Scotland; Europe; Great Britain; Hebrides; Highland region Scotland; Inner Hebrides; Inverness-shire Scotland; Isle of Skye; Mull Island; Scotland; United Kingdom; Western Europe; Strathclyde region Scotland
Coordinates:N570000 N574000 W0054000 W0064500
N561500 N564000 W0054000 W0063000
Abstract Numbers:02M/2384
Record ID:2002012357
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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