Improvement in the precision of the paleomagnetic intensity determination experiment

提高古地磁强度测定实验精度

• 批准号: 07554014
• 负责人: KONO Masaru
• 金额: $ 5.44万
• 依托单位: University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07554014/
• 关键词: paleomagnetism; measurement of remanence; altenating field demagnetization; computer control; 古地磁気学実験; 地球磁場強度; 古地磁気強度; 測定装置; ソフトウェア

(1) A new measurement system for paleointensity experimentsBased on the idea proposed by Kono et al. (J.Geomag. Geoelectr., 43,429,1991) , a new system was constructedby Natsuhara Giken Co. This system consists of (1) electric furnace with temperature control device, (2) sample rotation-translation unit, (3) fluxgate sensor with amplifier, (4) position detection unit, (5) coil for application of constant magnetic field, (6) three-layr magnetic shield, and (7) a PC to control all of these parts.(2) Software development for the new measurement systemTo control the system completely from a PC,a software package was developed including (1) motor control angle detection, (2) sliding control and position detection, (3) fluxgate signal amplification and AD conversion, (4) signal processing by FFT and calculation of magnetization, (5) temperature control, (6) magnetic field control, and (7) analysis of measurement results.(3) Experiments of paleointensity determinationUsing the newly developed instrument and the software, thermal demagnetization and Thellier's paleointensity experiments were carried out for basaltic samples from Iceland. The data analysis of experimentatl results are now in progress.

(1)一种新的古强度实验测量系统基于Kono等人提出的想法（J.Geomag.地电，43，429，1991），由Natsuhara Giken Co.建造了一种新的系统。该系统由（1）带有温度控制装置的电炉，（2）样品旋转-平移装置，（3）带有放大器的磁通门传感器，（4）位置检测装置，（5）用于施加恒定磁场的线圈，（6）三层磁屏蔽，以及（7）控制所有这些部分的PC。(2)新测量系统的软件开发为了完全从PC控制系统，开发了一个软件包，包括（1）电机控制角度检测，（2）滑动控制和位置检测，（3）磁通门信号放大和AD转换，（4）FFT信号处理和磁化计算，（5）温度控制，（6）磁场控制，（7）测量结果分析。(3)利用新研制的仪器和软件，对冰岛玄武岩样品进行了热退磁和Thellier古强度实验。实验结果的数据分析正在进行中。

项目成果

Tanaka, H., M.Kono, S.Kaneko: "Paleosecular variatoin of direction and intensity from two Pliocene-Pleistocene lava sequences in southwestern Iceland" J.Geomag. Geoelectr.47. 89-102 (1995)

Tanaka, H.、M.Kono、S.Kaneko：“冰岛西南部两个上新世-更新世熔岩序列的方向和强度的古世变” J.Geomag。

Masaru Kono: "Dynamo Theory in the Full Model Era (in Japanese)" Kagaku (Science). 66. 817-825 (1996)

Masaru Kono：“全模型时代的发电机理论（日语）” Kagaku（科学）。

Uchimura,H.,M.Kono,H.Tsunakawa,G.Kimura: "Paleomagnetism of Late Mesozoic rocks from Northeastern China:the role of the Tan-Lu fault in the North China Block" Tectonophysics. 262. 301-319 (1996)

内村，H.，M.Kono，H.Tsunakawa，G.Kimura：“中国东北晚中生代岩石的古地磁：郯庐断裂在华北地块中的作用”构造物理学。

Tanaka, H.: "Paleomagnetism and chronology of the central Taupo Volcanic Zone" Geophysical Journal International. (in press). (1996)

Tanaka, H.：“陶波火山带中部的古地磁学和年代学”《国际地球物理杂志》。

Kono, M.: "Kinematic dynamos with anisotropic α-effect" Geophycial and Astrophysical Fluid Dynamics. 77. 27-53 (1994)

Kono, M.：“具有各向异性 α 效应的运动发电机”地球物理和天体物理流体动力学 77. 27-53 (1994)。