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首页> 外文OA文献 >36Cl terrestrial cosmogenic nuclide dating suggests Late Pleistocene to Early Holocene mass movements on the south face of Aconcagua mountain and in the Las Cuevas–Horcones valleys, Central Andes, Argentina
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36Cl terrestrial cosmogenic nuclide dating suggests Late Pleistocene to Early Holocene mass movements on the south face of Aconcagua mountain and in the Las Cuevas–Horcones valleys, Central Andes, Argentina

机译：36Cl地球宇宙成因核素测年表明，阿根廷阿空加瓜山南面和阿根廷安第斯山脉Las Cuevas-Horcones谷地晚更新世至早全新世物质运动

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摘要

The morphology, sedimentology and mineralogy of deposits that previously had been associated with glacial advances (the Penitentes, Horcones and Almacenes drifts) were reinvestigated and dated using the terrestrial cosmogenic nuclide (TCN) 36Cl. These results indicate that the deposits previously associated with the Horcones and Almacenes drifts are actually deposits of a rock slope failure from the southern face of Aconcagua mountain forming a debris–ice avalanche that were deposited 10 490±1120 years ago, while the deposits previously associated with the Penitentes drift is a rock avalanche from the Mario Ardito valley that deposited in the Las Cuevas valley 11 220±2020 years ago. Earlier in the Late Pleistocene a further rock–ice avalanche sourced from Aconcagua mountain and deposited in the Las Cuevas valley, predating related lake sediments with a calibrated 14C age of 14 798–13 886 years and travertine deposits with a U-series age of 24 200±2000 years. In addition, three further rock-avalanche deposits were dated that sourced from Tolosa mountain, having 36Cl mean ages of 14 740±1950 years, 12 090±1550 years and 9030±1410 years. No deposits of massive rock slope failures were found in those parts of the valleys that date younger, suggesting that climatic conditions at the transition from the Late Pleistocene to the Holocene, that were different from today's, caused the slopes to fail. Alternatively, the rock slope failures could have been seismically triggered. We suggest that the slope failures at the southern face of Aconcagua mountain have caused or contributed to a reorganization of glacial ice flow from Aconcagua mountain that might ultimately be the cause of the surging behaviour of the Horcones Inferior glacier today. Our results indicate that the glacial stratigraphy of this part of the Central Andes is still poorly understood and requires detailed mapping and dating.
机译：使用陆生宇宙成因核素（TCN）36Cl对以前与冰川发展有关的沉积物的形态，沉积学和矿物学进行了重新研究，并确定了日期。这些结果表明，以前与Horcones和Almacenes漂移有关的沉积物实际上是阿空加瓜山南面的岩石斜坡破坏的沉积物，形成了10490±1120年前的碎屑-冰雪崩，而先前与沉积物有关的沉积物伴随着Penitentes漂流，是11220±2020年前沉积在Las Cuevas山谷中的Mario Ardito山谷的岩石雪崩。在晚更新世早期，从阿空加瓜山起源并沉积在拉斯库瓦斯山谷的进一步的冰冰雪崩，早于相关的湖沉积物，标定的14C年龄为14798-13886886年，钙华沉积的U系列年龄为24岁。 200±2000年此外，还确定了另外三个来自托洛萨山的岩石雪崩沉积物，其36Cl平均年龄为14740±1950年，12090±1550年和9030±1410年。在较年轻的那些山谷中没有发现大规模的岩石边坡破坏沉积物，这表明从晚更新世到全新世过渡的气候条件不同于今天，导致了边坡的破坏。或者，岩石边坡破坏可能是地震触发的。我们认为，阿空加瓜山南面的边坡破坏已导致或促成来自阿空加瓜山的冰川冰流的重组，这可能最终成为当今Horcones劣等冰川行为激增的原因。我们的结果表明，中安第斯山脉中部的冰川地层仍知之甚少，需要详细的制图和测年。

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