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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Magnetism of biotite crystals
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Magnetism of biotite crystals

机译：黑云母晶体的磁性

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We report Mossbauer spectra, magnetic hysteresis, acquisition and demagnetization of isothermal remanent magnetization (IRM), and low-temperature IRM warming curves of biotite crystals, as well as a summary of domain observations on magnetic extracts. The biotites are from 1.0 to 1.2 Ga gneisses and 1.85 Ga plutons of the Grenville, Churchill and Bear Provinces (Canada). Most have paramagnetic susceptibilities in the range (0.45-1.2) x 10(-3) SI, similar to reported values for iron-rich biotites. Magnetite, identified by its 120 K Verwey transition, is an inclusion in all the biotites. Sizes and domain states of inclusions correlate with magnetite content as measured by saturation magnetization M-s. The higher M-s is, the lower are the domain state indicators M-rs/M-s (M-rs is saturation IRM) and coercive force H-c. Added to a base population (0.003-0.1%) of pseudo-single-domain (PSD) grains with M-rs/M-s from 0.1 to 0.3 and H-c from 7 to 20 mT is <= 1% (in two exceptional cases, 7% and 14%) of coarse-grained multidomain (MD) magnetite with much softer hysteresis properties. The underlying PSD magnetite fraction in biotites potentially retains useful paleomagnetic remanence. In the more magnetic micas, this stable fraction may be swamped by MD magnetite with less stable behavior. (c) 2006 Elsevier B.V. All rights reserved.
机译：我们报告了Mossbauer光谱，磁滞现象，等温剩余磁化强度（IRM）的获取和消磁以及黑云母晶体的低温IRM升温曲线，以及对磁提取物的域观测的总结。黑云岩为格伦维尔，丘吉尔和贝尔斯（加拿大）的1.0至1.2 Ga片麻岩和1.85 Ga岩体。大多数磁化率在（0.45-1.2）x 10（-3）SI范围内，与富铁黑云母的报道值相似。通过其120 K Verwey转变确定的磁铁矿是所有黑云母中的一种。夹杂物的尺寸和畴态与通过饱和磁化强度M-s测量的磁铁矿含量相关。 M-s越高，畴状态指标M-rs / M-s（M-rs是饱和IRM）和矫顽力H-c越低。将M-rs / Ms从0.1到0.3且Hc从7到20 mT的伪单域（PSD）晶粒的基本种群（0.003-0.1％）添加为<= 1％（在两种例外情况下为7 ％和14％）的粗粒多畴（MD）磁铁矿，其磁滞特性要软得多。黑云母中潜在的PSD磁铁矿部分可能会保留有用的古磁剩磁。在更具磁性的云母中，这种稳定的馏分可能会被MD磁铁矿淹没，其行为不太稳定。 （c）2006 Elsevier B.V.保留所有权利。

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