A newly identified high-temperature shear zone, the Badrinath shear zone (BSZ), is described within the metamorphic core of the Himalayan belt along the Alaknanda valley, Garhwal Himalaya (NW India). A multidisciplinary approach comprising fieldwork, microstructural analyses, petrology and in situ monazite geochronology was addressed to this high-strain zone to better understand its role in the Greater Himalayan Sequence (GHS) evolution along the study area. The Badrinath mylonite displays top-to-the-south thrust-sense of shear and affects sillimanite-bearing gneiss showing evidence of partial melting. The data integration allowed us to reconstruct the following model for BSZ development: the pre-mylonitic stage took place during prograde metamorphic path reaching conditions of 700–720 °C and 10 kbar during the time interval of 34 and 23 Ma, with incipient partial melting, followed by nearly-isothermal decompression triggered by the shear activity between 23 and 19 Ma, with exhumation rate of ±0.3 cm yr⁻¹. Moreover, the rocks from the lower part of GHS, in the BSZ footwall, experienced metamorphic conditions of c. 660–700 °C and c. 10–11 kbar, the partial melting and exhumation took place ~3 Ma after the BSZ. Such findings led us to correlate the BSZ with the High Himalayan Discontinuity (HHD) of Central Himalaya. The BSZ is the first reported HHD branch in NW Himalaya (Garhwal). It corroborates the regional extent of the HHD accomplishing an important role during the GHS exhumation. In the Alaknanda valley, the BSZ activity accommodated deformation during early exhumation stages, 3 Ma before the MCTz and STDS coeval motion took place. Our observations point to a shift in time and place of the deformation responsible to trigger the GHS exhumation.

在印度西北部加尔瓦尔·喜马拉雅山的阿拉克南达河谷，喜马拉雅带的变质岩心中描述了一个新近识别的高温剪切带，即巴德林纳特剪切带（BSZ）。针对这一高应变带，提出了一种多学科的方法，包括野外工作，微观结构分析，岩石学和原位独居石年代学，以更好地了解其在研究区大喜马拉雅层序（GHS）演化中的作用。巴德林纳特（Badrinath）lon铁矿显示出自上而下的剪切推力感，并影响含硅线石的片麻岩，显示出部分熔融的迹象。数据整合使我们能够为BSZ的发展重建以下模型：前亚次生阶段是在34至23 Ma的时间间隔内，达到700–720°C和10 kbar的条件的正变质路径上发生的，^-1。此外，来自GHZ下部的BSZ底盘中的岩石经历了c的变质条件。660–700°C和c。在10-11 kbar时，BSZ之后约3 Ma发生了部分熔化和发掘。这些发现使我们将BSZ与喜马拉雅中部的高度喜马拉雅不连续性（HHD）相关联。BSZ是喜马拉雅西北（Garhwal）的第一个HHD分支机构。它证实了人类住区调查的区域范围在GHS掘尸过程中发挥了重要作用。在Alaknanda山谷中，BSZ活动在早期发掘阶段（MCTz和STDS同期运动发生前3 Ma）适应了变形。我们的观察结果表明，触发GHS掘尸的变形时间和位置发生了变化。