| 钻孔岩心重定向的古地磁学新方法及其在华南铀矿床岩心定向中的初步应用 |
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| 引用本文： | 葛坤朋,谢基海,应阳根,仇登登,王宇钦,邓居智.钻孔岩心重定向的古地磁学新方法及其在华南铀矿床岩心定向中的初步应用[J].地球物理学报,2020,63(8):3037-3049. |
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| 作者姓名： | 葛坤朋 谢基海 应阳根 仇登登 王宇钦 邓居智 |
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| 作者单位： | 1. 东华理工大学核资源与环境国家重点实验室, 南昌 330013;2. 东华理工大学地球物理与测控技术学院, 南昌 330013;3. 江西省核工业地质局261大队, 江西鹰潭 344400;4. 广东省核工业地质局293大队, 广州 510800 |
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| 基金项目： | 国家自然科学基金项目（41964003，41964006，41974078）；江西省自然科学基金资助项目（20192BAB202010）联合资助. |
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| 摘 要： | 基于岩石剩余磁化强度的矢量特性,使用古地磁学方法对钻孔岩心进行重新定向,对于解译地下构造、分析应力特征、判定成矿方向等问题具有重要意义.针对华南地区复杂构造下的倾斜钻孔岩心,本文构建了古地磁学岩心定向新方法理论,结合多次坐标转换和磁场一致性扫描,实现了基于黏滞剩磁的岩心重定向;设计了定向所需的成套古地磁学岩心定向、测量、取样装置,并将该方法和装置应用于华南铀矿钻孔的重定向,恢复后的岩心特征剩磁计算获得的早白垩世古地磁极位置与同期华南地块的极位置一致.该方法对地球物理深部探矿技术的改进有一定意义.此外,所设计的研究装置在古地磁学研究对象的拓展中也具有应用前景.
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| 关 键 词： | 古地磁学 岩心 重定向 坐标转换 剩磁 |
| 收稿时间： | 2020-03-26 |
A new paleomagnetic method of borehole core reorientation and its preliminary applications in reorientation of cores of uranium deposits in southern China |
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| GE KunPeng,XIE JiHai,YING YangGen,QIU DengDeng,WANG YuQin,DENG JuZhi.A new paleomagnetic method of borehole core reorientation and its preliminary applications in reorientation of cores of uranium deposits in southern China[J].Chinese Journal of Geophysics,2020,63(8):3037-3049. |
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| Authors: | GE KunPeng XIE JiHai YING YangGen QIU DengDeng WANG YuQin DENG JuZhi |
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| Institution: | 1. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China;2. School of Geophysics and Measurement-control Technology, East China University of Technology, Nanchang 330013, China;3. Jiangxi Province Nuclear Industry Geology Bureau 261 Dadui, Yingtan Jiangxi 344400, China;4. Guangdong Province Nuclear Industry Geology Bureau 293 Dadui, Guangzhou 510800, China |
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| Abstract: | Based on the vector characteristics of the rock remanent magnetization, the reorientation of the borehole core by paleomagnetism method is of great significance for interpreting the underground structure, analyzing the stress characteristics and determining the ore-forming direction. Aiming at the inclined borehole cores under complex structures in south China, a new orientation method for paleomagnetic cores is proposed in this paper, which combines multiple coordinate transformations and consistent magnetic field scanning to realize core reorientation based on viscous remanent magnetization. A complete set of paleomagnetic core orientation, measurement and sampling devices for orientation is designed, and the method is applied to the reorientation of boreholes in south China uranium deposits. The calculated position of paleomagnetic pole in early Cretaceous based on recovered core characteristic remanent magnetization is consistent with that of the South China Plate in the same period. This research has an important significance in improving deep geophysical prospecting technology. In addition, the designed research devices also have application prospect in the development of objects of study in paleomagnetism. |
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| Keywords: | Paleomagnetism Core Reorientation Coordinates transformation Remanence |
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