Petrography and rock magnetic properties of the Dalma volcanics (DV) and associated meta-sediments of Singhbhum mobile belt (SMB) are presented to describe magnetic grain size and Fe-Ti oxide mineralogy of the volcano-sedimentary sequence. Petrography revealed the presence of Ti-magnetite, hematite, ilmenite and pyrite in quartz-biotite-sericite-muscovite schists, quartzites, and volcanic rocks. The average value of magnetic susceptibility (χ) is 5.6 × 10⁻⁷ m³/kg, anhysteretic remanent magnetization (ARM) is 2.25 × 10⁻⁵ Am²/kg, saturating isothermal remanent magnetization (SIRM) is 403.33 × 10⁻⁵ Am²/kg, soft IRM is 240.2 × 10⁻⁵ Am²/kg, hard IRM is 77.56 × 10⁻⁵ Am²/kg, and natural remanent magnetization (NRM) is 54.1 mA/m. The central tendency of the inter-parametric ratio ARM/χ is 0.06 kAm⁻¹, SIRM/χ is 111.04 kAm⁻¹ and S-ratio is 0.8. Based on results, magnetic mineralogy indicated that the bulk magnetic carrier is stable single domain (SSD) or pseudo single domain (PSD) grains of Fe-Ti oxides with minor iron sulphides such as pyrite, greigite and pyrrhotite. Petrography and rock magnetic studies suggest that the magnetic carriers are chiefly secondary in origin and the NRM is modified over time.

介绍了达尔马火山 (DV) 和 Singhbhum 移动带 (SMB) 相关变质沉积物的岩石学和岩石磁性，以描述火山沉积层序的磁性粒度和 Fe-Ti 氧化物矿物学。岩相学揭示了在石英-黑云母-绢云母-白云母片岩、石英岩和火山岩中存在钛磁铁矿、赤铁矿、钛铁矿和黄铁矿。磁化率平均值（χ）为5.6×10 ^-7 m ³ /kg，磁滞剩磁（ARM）为2.25×10 ^-5 Am ² /kg，饱和等温剩磁（SIRM）为403.33×10 ^-5 Am ² /kg，软IRM为240.2 × 10 ^-5 Am ²/kg，硬IRM为77.56×10 ^-5 Am ² /kg，自然剩磁(NRM)为54.1 mA/m。参数间比ARM/χ的集中趋势是0.06 kAm ^-1，SIRM/χ是111.04 kAm ^-1并且S比是0.8。基于结果，磁性矿物学表明大块磁性载体是稳定的单畴 (SSD) 或伪单畴 (PSD) 铁钛氧化物颗粒，含有少量的硫化铁，如黄铁矿、灰黄铁矿和磁黄铁矿。岩石学和岩石磁性研究表明，磁性载体主要是次要的，并且 NRM 会随着时间的推移而改变。