| 碳酸盐岩中磁性矿物及其在古地理研究中的作用 |
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| 引用本文： | 徐和聆,马醒华,孙知明,陈克樵.碳酸盐岩中磁性矿物及其在古地理研究中的作用[J].古地理学报,2000,2(3):75-82. |
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| 作者姓名： | 徐和聆 马醒华 孙知明 陈克樵 |
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| 作者单位： | 中国地质科学院地质力学研究所 北京100081;
中国地质科学院矿床地质研究所 北京100037 |
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| 基金项目： | 国家自然科学基金资助项目“华北东部早古生代岩石中磁性矿物的系列相变及研究意义” (4 9972 0 2 0 )成果之一 |
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| 摘 要： | 磁性矿物及其转化现象在碳酸盐岩中十分常见。在其沉积演化各个阶段形成的磁性矿物，分别携带了它们形成时的古环境信息，是沉积古地理学和环境磁学的直接研究对象。磁性矿物在其形成过程中还受到地磁场的磁化作用，致使其获得了原生剩磁。鉴于对这类磁性矿物的准确鉴定及其所携带的原生剩磁成分的准确辨识，是获得可靠古地磁资料和建立地块极移曲线、编制非当今界限的古地理图与进行古地理重建的前提，从而成为古地磁学和大地构造古地理学的主要研究对象。在后生阶段形成的磁性矿物，通常由原有的磁性矿物转化而成，这种转化作用常起因于构造运动及与其密切相关的岩浆活动和流体活动。由于在其转化过程中，地磁场也相应发生了变化，所以新生磁性矿物就携带上新的剩磁（重磁化剩磁），因而它们也应该是古地磁学和大地构造古地理学的重要研究对象。如果在进行古地磁研究时，增加与构造事件和热事件相关样品的采集，加强磁性矿物的成因矿物学研究，那么就可以为进行古地理重建，提供更加可靠和更加丰富的古地磁资料。由此表明，在古地理学这一门综合性很强的地球科学，发展到巳经形成许多分支学科的今天，有必要关注磁性矿物与古地理研究之间的密切联系。
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| 关 键 词： | 碳酸盐岩 磁性矿物 古地理 构造古地理学 沉积古地理学 古地磁学 |
| 修稿时间： | 2000年1月14日 |
MAGNETIC MINERALS IN CARBONATE ROCKS AND THEIR ROLE IN PALAEOGEOGRAPHIC STUDY |
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| Xu Heling,Ma Xinghua,Sun Zhiming.MAGNETIC MINERALS IN CARBONATE ROCKS AND THEIR ROLE IN PALAEOGEOGRAPHIC STUDY[J].Journal of Palaeogeography,2000,2(3):75-82. |
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| Authors: | Xu Heling Ma Xinghua Sun Zhiming |
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| Institution: | Institute of Geomechanics,CAGS,Beijing 100081;
Institute of Mineral Deposits,CAGS,Beijing 100037 |
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| Abstract: | Various magnetic minerals and transformation between them exist in carbonate rocks. Magnetic minerals produced in each stage of the sedimentation evolusion process of the rocks carry information about the palaeoenvironments in their occurrence, and thus they become direct objects of study in sedimentary palaeogeography and environment magnetism. Magnetic minerals derive primary remanent magnetization from the geomagnetic field during their diagenesis. To correctly identify them and to distinguish remanent magnetism components of all kinds are prereguisite for gaining the reliable palaeomagnetic data,which are used for working out polar wander paths,drawing up palaeogeography maps with nonpresent boundaries and working the palaeogeographic reconstruction. Thus,they become the major objects of study in palaeomagnetism and tectonic palaeogeography.In the epigenesis stage,magnetic minerals are commonly formed from transformation of primitive ones. The transformation is often caused by tectonic movement or by the magmatism and the fluid medium activity relating to it. New magnetic minerals carry some information about remagnetized remanent magnetization. Thus,they should similarly be the major objects of study in palaeomagnetism and tectonic palaeogeography. We will offer more reliable and abundant palaeomagnetism data to people for working the palaeogeographic reconstruction if we collect more samples relative to the tectonic event and the thermal event and advance the minerageny study for magnetic minerals.It follows that the tight relation between magnetic minerals and the study on palaeogeography reguires our close attention though palaeogeography,a highly comprehensive branch of geoscience,has evolved into several branches. |
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| Keywords: | carbonate rock magnetic mineral palaeomagnetism sedimentary palaeogeography tectonic palaeogeography |
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