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• W179997383 abstract "Thermal Coe-modified-Thellier (CMT) and microwave (MW) palaeointensity (PI)investigations have been conducted on the Permo-Carboniferous Great Whin Sill (GWS)of northeast England, the Tertiary dyke swarm from the Isle of Skye and rocks from theEastern Australia Cenozoic igneous province. These results provide important newpalaeointensity data for the global palaeointensity (PINT) database in sparsely coveredtime windows.The GWS complex comprises at least three temporally distinct phases of intrusiveactivity. Fifty-six samples split between two of these phases, dated at ca. 269Ma and ca.294Ma, have been investigated. Rock-magnetic investigations indicate pseudo-single-domain (PSD) grain assemblage of magnetite, with Curie temperatures between 550[sup]°Cand 560[sup]°C in most samples. On comparison, data from CMT and MW investigationscould not be distinguished in terms of quality or their respective mean PI value.Combined CMT and MW results yield Virtual Dipole Moments (VDM) of1.2±O.1x10[sup]22 Am[sup]2 and 1.6± O.2x10[sup]22 Am[sup]2 for the younger and older phases respectively.These results, when coupled with previous estimates within the PINT database, support the view that the geomagnetic field intensity was dominantly lower during the Permo-Carboniferous Reverse Superchron in comparison with the present day value.The Tertiary dyke swarm of Skye comprises basaltic and doleritic intrusions.Thermomagnetic results suggest that the dominant magnetic mineral is magnetite orlow-Ti titanomagnetite, with Curie temperatures between 490[sup]°C and 570[sup]°C. Hysteresisdata suggest that samples comprise a PSD grain size assemblage. Many samples carrytwo anti-parallel remanence components, but the secondary low temperature (100-300[sup]°C) is unstable. A mean 2.2± 0.91x 10[sup]22 Am[sup]2 VDM is calculated for the ChRMbetween 300-550[sup]°C, from forty-three samples. Several basaltic lavas and intrusions weresampled and investigated from the Australian Cenozoic igneous rocks. Rock magneticanalysis indicates Ti-enriched titanomagnetite (TM[sub]70- TM[sub]50) as the dominant magnetic phase in all samples with pseudo-single domain characteristics. The primarytitanomagnetite carries a stable single component magnetization. Comparable MW andCMT data combine to produce three mean VDMs; 4.7± 0.7x 10[sup]22 Am[sup]2, 2.9± 1.4x 10[sup]22 Am[sup]2 and 3.1± 1.7x 10[sup]22 Am[sup]2 for volcanic rocks dated at c.48Ma, 46Ma and 22Marespectively. The low mean PI from both the British and Australian igneous provinces iscomparable with results from contemporaneous rocks, documented in the PINTdatabase, suggesting the early Tertiary field was weaker than that of the present day.Results from each of the sampled igneous provinces demonstrates comparabilitybetween the microwave and thermal CMT palaeointensity techniques. However, whilethe microwave method significantly shortens experimental time, no significantenhancements in data quality or success rates were achieved on the rocks investigated." @default.
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• W179997383 date "2006-01-01" @default.
• W179997383 modified "2023-09-27" @default.
• W179997383 title "Geomagnetic field intensities from tertiary and late carboniferous igneous rocks of the British Isles and Australia using modified Thellier and microwave palaeointensity techniques" @default.
• W179997383 hasPublicationYear "2006" @default.
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