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Multi-protocol palaeointensity determination from middle Brunhes Chron volcanics, Datong Volcanic Province, China

Multi-protocol palaeointensity determination from middle Brunhes Chron volcanics, Datong Volcanic Province, China
Multi-protocol palaeointensity determination from middle Brunhes Chron volcanics, Datong Volcanic Province, China
A full vector palaeomagnetic analysis of basalts from the Datong Volcanic Province, China, has been carried out to constrain the orientation and magnitude of the geomagnetic field during the mid-Brunhes Chron at approximately 0.41 Ma. Palaeomagnetic directions were determined using thermal demagnetization. Palaeointensity information was determined using a multi-protocol approach: (1) a Thellier-type protocol, (2) the multi-specimen parallel differential partial thermoremanence method, and (3) the Wilson method. The most consistent data set was obtained with the Wilson method, whilst similar average values, with wider data scatter, were obtained with the Thellier method. Higher values were obtained with the multi-specimen method. We suggest that consistency of results from the different protocols, which access different sections of the blocking/unblocking spectra, provide a useful test of the robustness of palaeointensity estimates. A mean virtual dipole moment of 5.4 ± 0.6 × 1022 Am2 was determined, which agrees well with coeval values from the PINT database and with the higher average palaeointensities for the mid-Brunhes Chron indicated by more continuous sedimentary relative palaeointensity records.
Palaeointensity, Thellier, Wilson, Multi-specimen, Geomagnetic field behaviour
0031-9201
188-198
Muxworthy, Adrian R.
7fa5c819-b5ca-4354-83df-f9481b16ed1e
Ji, Xinlin
3aadbc4c-aa69-44bf-a052-43f38c3c24d0
Ridley, Victoria
8f014a32-b7d1-41a0-9edb-6cdad6de1100
Pan, Yongxin
70611af6-4fde-454e-9764-9e6ef696e92f
Chang, Liao
f526f675-e627-4666-b1c9-3e94029706ee
Wang, Lei
414e92d7-ec71-4a00-9487-757212d6f6f8
Roberts, Andrew P.
4f062491-5408-4edb-8dd1-140c6a42e93f
Muxworthy, Adrian R.
7fa5c819-b5ca-4354-83df-f9481b16ed1e
Ji, Xinlin
3aadbc4c-aa69-44bf-a052-43f38c3c24d0
Ridley, Victoria
8f014a32-b7d1-41a0-9edb-6cdad6de1100
Pan, Yongxin
70611af6-4fde-454e-9764-9e6ef696e92f
Chang, Liao
f526f675-e627-4666-b1c9-3e94029706ee
Wang, Lei
414e92d7-ec71-4a00-9487-757212d6f6f8
Roberts, Andrew P.
4f062491-5408-4edb-8dd1-140c6a42e93f

Muxworthy, Adrian R., Ji, Xinlin, Ridley, Victoria, Pan, Yongxin, Chang, Liao, Wang, Lei and Roberts, Andrew P. (2011) Multi-protocol palaeointensity determination from middle Brunhes Chron volcanics, Datong Volcanic Province, China. Physics of the Earth and Planetary Interiors, 187 (3-4), 188-198. (doi:10.1016/j.pepi.2011.06.005).

Record type: Article

Abstract

A full vector palaeomagnetic analysis of basalts from the Datong Volcanic Province, China, has been carried out to constrain the orientation and magnitude of the geomagnetic field during the mid-Brunhes Chron at approximately 0.41 Ma. Palaeomagnetic directions were determined using thermal demagnetization. Palaeointensity information was determined using a multi-protocol approach: (1) a Thellier-type protocol, (2) the multi-specimen parallel differential partial thermoremanence method, and (3) the Wilson method. The most consistent data set was obtained with the Wilson method, whilst similar average values, with wider data scatter, were obtained with the Thellier method. Higher values were obtained with the multi-specimen method. We suggest that consistency of results from the different protocols, which access different sections of the blocking/unblocking spectra, provide a useful test of the robustness of palaeointensity estimates. A mean virtual dipole moment of 5.4 ± 0.6 × 1022 Am2 was determined, which agrees well with coeval values from the PINT database and with the higher average palaeointensities for the mid-Brunhes Chron indicated by more continuous sedimentary relative palaeointensity records.

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More information

Published date: August 2011
Keywords: Palaeointensity, Thellier, Wilson, Multi-specimen, Geomagnetic field behaviour
Organisations: Geology & Geophysics

Identifiers

Local EPrints ID: 199267
URI: http://eprints.soton.ac.uk/id/eprint/199267
ISSN: 0031-9201
PURE UUID: c670ba7c-0734-4863-93ce-f8fc608b83f1

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Date deposited: 12 Oct 2011 15:16
Last modified: 14 Mar 2024 04:15

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Contributors

Author: Adrian R. Muxworthy
Author: Xinlin Ji
Author: Victoria Ridley
Author: Yongxin Pan
Author: Liao Chang
Author: Lei Wang
Author: Andrew P. Roberts

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