Titanomagnetites are important carriers of magnetic remanence in nature and can track redox conditions in magma. The titanium concentration in magnetite bears heavily on its magnetic properties, such as saturation moment and Curie temperature. On land and in the deep ocean, however, these minerals are prone to alteration which can mask the primary magnetic signals they once recorded. Thus, it is essential to characterize the cation composition and oxidation state of titanomagnetites that record the paleomagnetic field. Raman spectroscopy provides a unique tool for both purposes. Nonetheless, the heat generated by the excitation laser can itself induce oxidation. We show that the laser power threshold to produce oxidation decreases with increasing titanium content. With confocal Raman spectroscopy and magnetic force microscopy (MFM) on natural and synthetic titanomagnetites, a non-destructive Raman imaging protocol was established. We applied this protocol to map out the composition and magnetization state within a single ex-solved titanomagnetite grain in a deep-sea basalt. Copyright (C) 2011 John Wiley & Sons, Ltd.
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Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Peoples R China
Friedrich Alexander Univ Erlangen Nurnberg FAU, Lehrstuhl Tech Thermodynam LTT, D-91058 Erlangen, Germany
Friedrich Alexander Univ Erlangen Nurnberg FAU, Erlangen Grad Sch Adv Opt Technol SAOT, Erlangen, GermanyHarbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Peoples R China
Zhu, Wenkun
Yuan, Mengfan
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Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Peoples R ChinaHarbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Peoples R China
Yuan, Mengfan
Axt, Christian
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Rhein Westfal TH Aachen, Inst Heat & Mass Transfer, D-52062 Aachen, GermanyHarbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Peoples R China
Axt, Christian
Li, Xiaohui
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Harbin Inst Technol, Natl Key Lab Sci & Technol Tunable Laser, Harbin 150080, Peoples R ChinaHarbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Peoples R China
Li, Xiaohui
Massmeyer, Anna
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Rhein Westfal TH Aachen, Inst Heat & Mass Transfer, D-52062 Aachen, GermanyHarbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Peoples R China
Massmeyer, Anna
Sun, Rui
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Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Peoples R ChinaHarbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Peoples R China