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首页> 外文期刊>Journal of Asian earth sciences >Chronology of late Quaternary glaciation in the Pindar valley, Alaknanda basin, Central Himalaya (India)
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Chronology of late Quaternary glaciation in the Pindar valley, Alaknanda basin, Central Himalaya (India)

机译：印度喜马拉雅山中部阿拉克南达盆地平达尔河谷晚第四纪冰期的年代学

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摘要

Palaeoglacial reconstruction based on geomorphological mapping in the Pindari glacier valley, Alaknanda basin (Central Himalaya), has revealed five glacial stages with decreasing magnitude. The oldest and most extensive stage-Ⅰ glaciation deposited sediments at ～2200 masl (Khati village). The stage-Ⅱ glaciation was around 7 km long and luminescence dated to 25 ± 2 ka, and has deposits at 3200 masl (Phurkia village). Stage-Ⅲ glaciation is represented by degraded linear moraine ridges and is dated to 6 ± 1 ka and its remnants can be found around 3850 masl. A sharp crested crescentic moraine extending from around 3650 masl to 3900 masl is attributed to stage-Ⅳ glaciation and is dated to 3 ± 1 ka. Following this, there appears to have been a gradual recession in Pindari glacier as indicated by four sharp crested unconsol-idated moraines (stage-Ⅴ) on the valley floor which abuts the stage-Ⅳ moraine. We suggest that the stage-Ⅰ glaciation occurred during the cool and wet Marine Isotopic Stage 3/4 (MIS-3/4), stage-Ⅱ glaciations began with the onset of MIS-2, whereas the stage-Ⅲ and Ⅳ glaciations occurred during the mid-to late Holocene (MIS-1). We speculate that the first sharp crested unconsolidated moraines around 3600 masl correspond to the later phase of the Little Ice Age (LIA). Historical data suggests that the remaining three ridges represent Pindari glacier snout positions at 1906, 1958 and 1965. We argue that the late Quaternary glaciations in the Pindar valley were modulated by changing insolation and summer monsoon intensity including the LIA, whereas the 20th century recessional trends can be attributed to post-LIA warming.
机译：基于地貌图的古冰川重建（位于喜马拉雅中部）Alaknanda盆地的Pindari冰川山谷中，揭示了五个冰川阶段，其幅度不断减小。最古老，最广泛的Ⅰ期冰川沉积在〜2200 masl（卡提村）处沉积。 Ⅱ期冰期长约7 km，发光时间为25±2 ka，沉积物位于3200 masl（Phurkia村）。 Ⅲ期冰期以退化的线性冰ora脊为代表，其年代可追溯至6±1 ka，其残留物可在3850 masl附近发现。尖锐的新月形冰m从大约3650 masl延伸到3900 masl，归因于Ⅳ期冰期，年代为3±1 ka。此后，平达里冰川似乎出现了逐渐衰退，这表现为在靠近谷底Ⅳ期冰ora的谷底出现了四个尖锐的峰顶未固溶的冰rain（阶段Ⅴ）。我们认为Ⅰ期冰期发生在湿，湿的海洋同位素阶段3/4（MIS-3 / 4）期间，Ⅱ期冰期始于MIS-2的开始，而Ⅲ期和Ⅳ期冰期发生。在全新世中期至晚期（MIS-1）。我们推测，大约3600 masl的第一个尖锐的未固结的mo粒对应于Little Ice Age（LIA）的后期。历史数据表明，其余三个山脊代表1906、1958和1965年的Pindari冰川口鼻位置。我们认为Pindar山谷中的第四纪晚期冰川是通过改变日照强度和包括LIA的夏季风强度来调节的，而20世纪的衰退趋势是可以归因于LIA后变暖。

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