Specimen size and improved precision with the Molspin spinner magnetometer |
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| Institution: | 1. IDL-FCUL, Instituto Dom Luís, Faculdade de Ciências, Universidade de Lisboa, Campo Grande 1749-016, Portugal;2. ISTE, Geopolis, CH-1015 Lausanne, Switzerland;3. Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Rome, Italy;4. Institute of Tectonics and Geophysics, Russian Academy of Sciences, Khabarovsk, Russia;5. Hercules, Evora, Portugal;1. National Centre for Earth Science Studies, Akkulam 695 011, Trivandrum, India;2. Department of Physics, Annamalai University, Annamalainagar 608 002, Tamilnadu, India;3. Department of Physics, Sir Theagaraya College, Chennai 600 021, India |
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| Abstract: | Manual reorientation of traditional 10.5 cm3 paleomagnetic cores between successive spins in Molspin-type magnetometers produces some operator error that may be significantly reduced if smaller core (5.1 cm3) is used instead. The smaller core may be locked into a cubical holder that ensures its precise angular alignment between successive spins of the magnetometer. This significantly improves precision of the mean vector direction for replicate measurements, or for a suite of specimens, provided that the magnetic mineralogy of the rock is sufficiently homogenous to be meaningfully characterized in the smaller (5.1 cm3) core. The smaller core is more quickly measured and less expensive to drill. |
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