Laser-selective demagnetizaton: A new technique in paleomagnetism and rock magnetism

Paul R. Renne, Tullis C. Onstott

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Laser-selective demagnetization (LSD) enables the determination of the magnetic moment associated with individual mineral grains in thin sections of rock. Small volumes can be demagnetize with laser pulses directed through the optics of a microscope, permitting resolution of remanence components in individual mineral grains. LSI) of mafic granulite samples revealed two paleomagnetic directional components of opposite polarity: one resided in coarse magnetite, the other in ilmenohematite-hemoilmenite exsolution intergrowths and fine magnetite indusions in clinopyroxene. These directions are consistent with those inferred from bulk demagnetization techniques, but LSD permits direct identification of the remanence carriers. The ability to discriminate magnetization components in different generations of a single mineral and to define intergrain magnetic moment distributions are significant advantages of LSD.

Original languageEnglish (US)
Pages (from-to)1152-1155
Number of pages4
JournalScience
Volume242
Issue number4882
DOIs
StatePublished - Jan 1 1988

All Science Journal Classification (ASJC) codes

  • General

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