- 作者：Emilio Herrero-Berveraa ; herrero@soest.hawaii.edu" class="auth_mail" title="E-mail the corresponding author ; David Krasab ; Martin J. Van Kranendonkc
- 关键词：Geomagnetic field strength ; Absolute paleointensity ; Dacites ; Duffer Fm ; 3.5 Billion years ago ; Whole rocks
- 刊名：Physics of the Earth and Planetary Interiors
- 出版年：2016
- 出版时间：September 2016
- 年：2016
- 卷：258
- 期：Complete
- 页码：51-62
- 全文大小：2965 K
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This paper is about the effort to determine the absolute paleointensity (PI) of eleven un-oriented samples of the red dacite of the Duffer Formation (ca. 3467 ± 5 Ma) collected from the Pilbara Craton in Western Australia.
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The magnetic carriers of magnetization are primarily titanomagnetite and pure magnetite.
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We performed PI determinations using the modified Thellier-Coe protocol and we obtained a very high success rate that allowed us to calculate the strength of the geomagnetic field that yielded values of ∼6.4 ± 0.68 (N = 11) micro-Teslas with a Virtual Dipole Moment (VDM) of 1.51 ± 0.81 × 1022 Am2.
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We interpreted these results a product of a thermochemical remanent magnetization (TCRM) that indicated a possible underestimation of the paleofield during Archean time by a factor of four.