Knowledge of the formation and evolution of cratonic subcontinental lithospheric mantle is critical to our understanding of the processes responsible for continental development. Here, we report the deformation microstructures and lattice preferred orientations (LPOs) of olivine and pyroxenes alongside petrological data from spinel peridotite xenoliths beneath the Baekdusan volcano. We have used these datasets to constrain the evolution of deformation fabrics related to petrogenesis from the Baekdusan peridotites. Based on petrographic features and deformation microstructures, we have identified two textural categories for these peridotites: coarse- and fine-granular harzburgites (CG and FG Hzb). We found that mineral composition, equilibrium temperature, olivine LPO, stress, and extraction depth vary considerably with the texture. We suggest that the A-type olivine LPO in the CG Hzb may be related to the preexisting Archean cratonic mantle fabric (i.e., old frozen LPO) formed under high-temperature, low-stress, and dry conditions. Conversely, we suggest that the D-type olivine LPOs in the FG Hzb samples likely originated from later localized deformation events under low-temperature, high-stress, and dry conditions after a high degree of partial melting. Moreover, we consider the Baekdusan peridotite xenoliths to have been derived from a compositionally and texturally heterogeneous vertical mantle section beneath the Baekdusan volcano.

中文翻译：

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Baekdusan火山下上地幔异种岩成因相关的变形构造演化

对克拉通次大陆岩石圈地幔的形成和演化的了解对于我们了解负责大陆发展的过程至关重要。在这里，我们报道了橄榄石和辉石的变形微观结构和晶格优先取向（LPO），以及来自Baekdusan火山下尖晶石橄榄岩异岩的岩石学数据。我们已经使用这些数据集来约束与Baekdusan橄榄岩的岩石成因有关的变形构造的演化。基于岩石学特征和形变微观结构，我们为这些橄榄岩确定了两种质地类别：粗粒状和细粒状的哈兹伯格岩（CG和FG Hzb）。我们发现矿物成分，平衡温度，橄榄石LPO，应力和提取深度随质地而有很大不同。我们建议CG Hzb中的A型橄榄石LPO可能与在高温，低应力和​​干燥条件下形成的先前存在的太古宙克拉通地幔结构（即，旧的冷冻LPO）有关。相反，我们建议FG Hzb样品中的D型橄榄石LPO可能源自在高度局部熔化后在低温，高应力和干燥条件下的后来的局部变形事件。此外，我们认为，Baekdusan橄榄岩异岩是从Baekdusan火山下方的组成和质地非均质的垂直地幔剖面中获得的。我们认为，FG Hzb样品中的D型橄榄石LPO可能是由于高度局部熔融后在低温，高应力和干燥条件下发生的局部变形事件引起的。此外，我们认为，Baekdusan橄榄岩异岩是从Baekdusan火山下方的组成和质地非均质的垂直地幔剖面中获得的。我们认为，FG Hzb样品中的D型橄榄石LPO可能是由于高度局部熔融后在低温，高应力和干燥条件下发生的局部变形事件引起的。此外，我们认为，Baekdusan橄榄岩异岩是从Baekdusan火山下方的组成和质地非均质的垂直地幔剖面中获得的。