Strike‐parallel tectonometamorphic discontinuities within the Himalayan metamorphic core are typically interpreted to reflect thrust‐sense movement. However, there is disagreement on the nature and sense of movement across one such structure in central Nepal. Using an integrated approach, this study characterizes multiple structural breaks in the Modi Khola region. Thermobarometric calculations combined with petrochronological investigation show that rocks across the Sinuwa thrust record similar histories with prograde garnet growth ca. 35 Ma and peak pressures of ~11.0 kbar, anatexis at ca. 28 Ma, and followed by cooling and exhumation between ca. 24 and 15 Ma. Rocks below the structurally lower Bhanuwa fault record similar garnet growth at ca. 35 Ma and pressures of ~11.5 kbar but experienced melting and retrogression after ca. 21 Ma. Finally, rocks in the footwall of the Main Central thrust, the structurally lowest break investigated, record prograde metamorphism ca. 17–13 Ma with peak pressures of ~7.0 kbar. This down‐structural migration of prograde metamorphism, anatexis, and subsequent cooling and exhumation of the footwall is consistent with models of progressive underplating and in‐sequence thrusting. When paired with published cooling ages across the Bhanuwa fault, results from this study are consistent with normal‐sense reactivation of the structure during middle‐late Miocene time. This new data set shows that the final assembly of the Himalayan metamorphic core is a result of progressive deformation and juxtaposition of multiple thrust sheets through a combination of in‐sequence thrusting, out‐of‐sequence thrusting, and normal faulting. We refer to this as the Greater Himalayan thrust belt.

中文翻译：

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喜马拉雅大推力带：洞悉尼泊尔中部莫迪霍拉山谷掘出的喜马拉雅变质岩心

通常将喜马拉雅变质岩心内的走向平行的构造变质不连续性解释为反映逆向感觉运动。但是，在尼泊尔中部的一个这样的结构上，人们对运动的性质和感觉存在分歧。使用综合方法，本研究表征了莫迪霍拉地区的多个结构性断裂。热压法计算与岩石年代学研究相结合表明，穿过Sinuwa推力的岩石记录了相似的历史，其石榴石的生长呈渐进状。35 Ma，峰值压力为〜11.0 kbar，在 28 Ma，然后冷却和回火之间。24和15 Ma。在结构上较低的Bhanuwa断层以下的岩石在大约记录到石榴石生长。35 Ma和约11.5 kbar的压力，但在约20分钟后经历熔化和倒退。21 Ma。最后，在主要中央逆冲断层下盘的岩石中，研究了结构上最低的断层，记录了约化的变质作用。17-13 Ma，峰值压力约为7.0 kbar。渐进的变质，厌食症以及随后的下盘壁冷却和发掘的这种向下结构的迁移与渐进式底层侵覆和顺序推进作用的模型一致。当与已发布的横跨Bhanuwa断层的冷却年龄相结合时，这项研究的结果与中新世中期晚期结构的正常意义上的活化相一致。这个新的数据集表明，喜马拉雅变质岩心的最终组装是通过依次冲断，无序冲断和正断层相结合而使多个冲断层逐渐变形和并置的结果。