Rapid, precise, and high-sensitivity acquisition of paleomagnetic and rock-magnetic data: Development of a low-noise automatic sample changing system for superconducting rock magnetometers

Joseph L. Kirschvink*, Robert E. Kopp, Timothy D. Raub, Christopher T. Baumgartner, John W. Holt

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    126 Citations (Scopus)

    Abstract

    Among Earth sciences, paleomagnetism is particularly linked to the statistics of large sample sets as a matter of historical development and logistical necessity. Because the geomagnetic field varies over timescales relevant to sedimentary deposition and igneous intrusion, while the fidelity of recorded magnetization is modulated by original properties of rock units and by alteration histories, "ideal'' paleomagnetic results measure remanent magnetizations of hundreds of samples at dozens of progressive demagnetization levels, accompanied by tests of magnetic composition on representative sister specimens. We present an inexpensive, open source system for automating paleomagnetic and rock magnetic measurements. Using vacuum pick-and-place technology and a quartz-glass sample holder, the system can in 1 h measure remanent magnetizations, as weak as a few pAm(2), of similar to 30 specimens in two vertical orientations with measurement errors comparable to those of the best manual systems. The system reduces the number of manual manipulations required per specimen approximately eightfold.

    Original languageEnglish
    Article numberARTN Q05Y01
    Number of pages18
    JournalGeochemistry, Geophysics, Geosystems
    Volume9
    DOIs
    Publication statusPublished - 2 May 2008

    Keywords

    • sensitivity
    • PARTICLES
    • automation
    • BOUNDARY
    • DEMAGNETIZATION
    • STABILITY
    • rock magnetism
    • SEDIMENT CORES
    • paleomagnetism
    • REMANENT MAGNETIZATION

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