细粒磁铁矿的系统合成及其岩石磁学应用评述

Review of systematic synthesis methods of fine magnetite and its application in rock magnetism

单畴及其邻域的细粒磁铁矿是古地磁学研究中的主导载磁矿物之一.磁铁矿的磁学性质受到粒径、晶型、形状以及氧化程度等物化属性控制,影响了古地磁数据记录的准确性,并造成对应地质解释的多解性.鉴于自然磁铁矿颗粒的复杂性、微磁模拟的计算有限性、以及显微观测的局域性,本文首先阐述了细粒磁铁矿的重要岩石磁学意义,随后综述了细粒磁铁矿合成在岩石磁学领域内的研究现状、应用和困境.通过系统介绍材料磁学的细粒磁铁矿合成方法,指出其在古地磁学研究中的科学意义.本文最后对综合磁学合成方法的应用提出了展望,包括“磁不稳定区”颗粒的研究、古强度学应用研究和岩石磁学正反演研究等.本文将为细粒磁铁矿合成及岩石磁学应用提供参考,并加深我们对矿物磁学性质及关联地质过程的理解.

Fine-grained magnetite with single domain and its neighborhood is one of the dominant magnetic-carrying minerals in paleomagnetism.Its magnetic properties depend strongly on particle size,crystal form,shape and oxidation degree,etc.,regardless of which will result in inaccuracy of paleomagnetic data recording and ambiguities in corresponding geological interpretations.In view of the complexity of natural magnetite particles,the computational limitation of micromagnetic modeling,and the locality of microscopic observation,we firstly elaborates on the significance of fine magnetite synthesis in rock magnetism,and then reviews the research status,applications,and challenges of fine-grained magnetite synthesis in rock magnetism.By introducing the synthesis methods of fine-grained magnetite in material magnetism,we then expound the paleomagnetic significance in geological applications.Finally,the applications of integrated magnetic synthesis method are put forward,including the study of the"magnetic unstable"particles,paleointensity and the forward and inversion of rock magnetism.This paper will provide systematic reference for the synthesis of fine-grained magnetite and its rock magnetic applications,and deepen our understanding of mineral magnetic properties and related geological processes.