塔里木早奥陶世白云岗灰岩样品中,包含有原生剩磁和重磁化等多磁组分,同一岩层中的多重磁组分具有重要的岩石磁学意义.岩石中磁性矿物类型和样品成岩历史的差异,均会使岩石产生不同类型的重磁化.对多重磁组分的解释,取决于对携磁矿物的种类、产状及其与岩石中其他矿物关系的认识.以往对磁性矿物的研究,常采用化学溶蚀法获得岩石中的磁性矿物,但它与周围矿物的结构构造关系在提取过程中被破坏,后者对指示重磁化的地质意义极为重要.本文在对白云岗组灰岩进行剩磁及等温剩磁测试的基础上,通过光学显微镜和扫描电子显微镜观察了样品岩石薄片中携磁矿物的结构构造、结晶特征、形态、颗粒大小和矿物共生组合,区分出了原生剩磁和次生剩磁的携磁矿物,获得了有关携磁矿物的岩石学证据,并解释了白云岗组炭岩的原生剩磁与重磁化产生的原因.1 样品及其古地磁结果样品采自库鲁克塔格雅尔当山剖面下奥陶统白云岗组,为黑色致密状灰岩、泥晶灰岩、瘤状灰岩.对该剖面的古地磁研究表明,样品经历了部分重磁化,但天然剩磁中保留有相当强度的原生剩磁组分.对白云岗组样品的剩磁特征分离结果显示有三组磁组分:(1)软磁组分,在100℃左右被清洗;(2)中等稳定性磁组分,该组分几乎全部集中在现代地磁场附近,其平均方向为D=15.3° The samples of dolomitic limestone from the Early Ordovician in Tarim Basin contain multi-magnetic components such as primary remanence and heavy magnetism, and the multiple magnetic components in the same rock have important lithological significance. The types of magnetic minerals and diagenesis The differences in history lead to different types of re-magnetization of rocks.The interpretation of multiple magnetic components depends on the understanding of the species and occurrence of the magnetic minerals and their relationship with other minerals in the rock.In the past, In the study, the chemical dissolution method is often used to obtain the magnetic minerals in the rock, but the structural relationship with the surrounding minerals is destroyed in the extraction process, which is of great importance to the geological significance of the re-magnetization. On the basis of remanence and isothermal remanent magnetization tests, the structure, crystallinity, morphology, grain size and mineral assemblage of the magnetocrystalline minerals in the samples were observed by light microscopy and scanning electron microscopy. And secondary remanent magnetism-bearing minerals, obtained the petrology evidence of magnetism bearing minerals and explained the original remanence and re-magnetization of the carbonates in the Baiyungang Formation .1 The samples and their paleomagnetic results were collected from the Lower Ordovician Baiyugang Formation in the Kuruktagyajaldang Mountain Profile and are black dense limestone, dolomitic limestone and nodulated limestone. The geomagnetic study shows that the sample has undergone some re-magnetization, but the native remanence retained a considerable strength of the primary remanence.The separation of remanence characteristics of the samples from the Baiyungang Formation showed three sets of magnetic components: (1) soft magnetic The components are cleaned at about 100 ° C. (2) The moderately stable magnetic components, which are mostly concentrated in the vicinity of the modern geomagnetic field with an average direction of D = 15.3 °