To better understand what drives erosion in central Nepal, we have mapped regions of preferential erosion by comparing modern detrital muscovite ⁴⁰Ar/³⁹Ar data to bedrock data from the Narayani river catchment and two subcatchments in central Nepal. We compare our pattern of erosion to erosion patterns from previous studies. Each shows a zone of preferential erosion from 5 km south to 20 km north of the Main Central Thrust (MCT). Peak erosion occurs in a 5‐km‐wide, orogen‐parallel band, north of the MCT, overlapping proposed ramps in the Main Himalayan Thrust (MHT). This location of peak erosion is consistent with the interpretation that erosion is tectonically driven. Although peak erosion is spatially coincident with the interpreted MHT ramps, the zone of enhanced erosion extends north of the ramps' downdip limits suggesting that an additional driver of rock uplift is at work. This can be explained by a duplex growing along the ramp back‐tilting and uplifting older duplex faults. This region also coincides with a dynamically supported bulge in the High Himalaya where a reservoir of elastic strain appears to be maintained over numerous seismic cycles further enhancing erosion.

中文翻译：

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尼泊尔中部中新生代坡度，中生斜坡位置，双相生长和动态维持的弹性应变控制的中新世后侵蚀

为了更好地了解尼泊尔中部侵蚀的驱动因素，我们通过比较现代碎屑白云母⁴⁰ Ar / ³⁹绘制了优先侵蚀区域Ar数据为Narayani河流域和尼泊尔中部两个子流域的基岩数据。我们将侵蚀模式与先前研究的侵蚀模式进行了比较。每个图样都显示了从主中央冲断带（MCT）南侧5公里到北侧20公里的优先侵蚀带。峰值侵蚀发生在MCT以北5公里宽，与造山带平行的带中，与喜马拉雅主冲断层（MHT）中的拟建坡道重叠。峰值侵蚀的位置与构造驱动的侵蚀的解释是一致的。尽管峰值侵蚀在空间上与解释的MHT斜坡在空间上重合，但是侵蚀加剧的区域在斜坡的下倾极限以北延伸，这表明有一个额外的岩石隆起动因正在起作用。这可以通过沿斜坡向后倾斜和抬升较旧的双工断层的双工现象来解释。