Magnetofabrics of shear zones and ultrahigh-pressure rocks from the Chinese Continental Scientific Drilling (CCSD)

中国大陆科学钻探（CCSD）将中国东部三叠系—侏罗系苏鲁—超高压造山带的地壳和地幔超高压（UHP）岩石相交叉。CCSD提供了5.1公里的由剪切带分隔的堆叠超高压岩石垂直剖面。交错岩石主要有榴辉岩、角闪岩、片麻岩和少量橄榄岩。榴辉岩和片麻岩中的石榴石和锆石中的钴矿包裹体表明，相交的岩石俯冲至上地幔深度（约80 ~ 80 km），随后被发掘出来。岩心样品的岩石磁性研究提供了一个独特的机会来监测结构元素的垂直变化、应变梯度、流体-岩石相互作用和氧流通量的变化，特别是在韧性剪切带之间。重点将放在片麻岩中的橄榄岩、榴辉岩和高品位剪切带的岩石磁性（各向异性和温度依赖性磁化率、磁矿物学）。敏感性张量包括两个可分离的织物分量，它们记录相同或不同，从而可能发生多相或渐进变形。岩石磁学研究有助于解决与构造地质学、岩石学、矿物学和地球化学有关的问题，因此可能有助于通过多学科方法更好地理解挖掘过程。

The Chinese Continental Scientific Drilling (CCSD) in Donghai intersected crustal and mantle ultrahigh-pressure (UHP) rocks from the Triassic-Jurassic Sulu-UHP-orogen in eastern China. The CCSD provides a 5.1 km vertical section of stacked UHP-rocks separated by shear zones. The intersected rocks mainly comprise eclogites, amphibolites, gneisses, and minor peridotites. Coesite inclusions in garnet and zircon from eclogites and gneisses indicate that the intersected rocks were subducted to upper mantle depths (>80 km) and subsequently exhumed. Rock magnetic studies on drill core samples provide a unique chance to monitor vertical changes of structural elements, strain gradients, fluid-rock interactions, and changes of oxygen fugacities especially across ductile shear zones. A focus will be placed on rock magnetic properties (anisotropy of and temperature dependent magnetic susceptibility, magneto-mineralogy) of peridotites, eclogites, and high-grade shear zones in gneisses. The susceptibility tensor comprises two fabric components which can be isolated and which recorded the same or different and thus possible polyphase or progressive deformation. Rock magnetic studies contribute to questions related with structural geology, petrology, mineralogy, and geochemistry, and thus may contribute to a better understanding of exhumation processes by its multidisciplinary approach.