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首页> 外文期刊>Tectonics >Spatial variation in exhumation rates across Ladakh and the Karakoram: New apatite fission track data from the Eastern Karakoram, NW India
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Spatial variation in exhumation rates across Ladakh and the Karakoram: New apatite fission track data from the Eastern Karakoram, NW India

机译：拉达克和喀喇昆仑山脉掘尸速率的空间变化：来自印度西北部东部喀喇昆仑山脉的新磷灰石裂变径迹数据

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Characterization of low-temperature cooling histories and associated exhumation rates is critical for deciphering the recent evolution of orogenic regions. However, these may vary significantly over relatively short distances within orogens. It is pertinent therefore to constrain cooling histories and hence exhumation rates across major tectonic boundaries. We report the first apatite fission track ages from the Karakoram Fault Zone in the Eastern Karakoram range, which forms part of the western margin of the Tibetan Plateau. Ten samples, from elevations of 3477-4875m, have apatite fission track dates from 3.30.3Ma to 7.41.1Ma. The ages correspond to modeled average erosional exhumation rates of 0.67+0.27/-0.18mm/yr across the Eastern Karakoram. The results are consistent with a trend northward from the Indus suture zone, across the Ladakh terrane and into the Karakoram, in which tectonic uplift associated with crustal thickening increases toward the north, raising elevation and promoting glaciation and generation of extreme relief. As a result, erosion and exhumation rates increase south to north. Present-day precipitation on the other hand varies little within the study area and on a larger scale decreases southwest to northeast across this portion of the orogen. The Eastern Karakoram results highlight the diverse patterns of exhumation driven by regional variations in tectonic response to collision along the western margin of Tibet.
机译：低温冷却历史和相关的发掘速率的表征对于破译造山带最近的演化至关重要。但是，在造山带内相对较短的距离内，这些变化可能会很大。因此，有必要限制主要构造边界的冷却历史和掘尸率。我们报告了东部喀喇昆仑山脉喀喇昆仑断裂带的第一个磷灰石裂变径迹年龄，该地区是青藏高原西缘的一部分。海拔3477-4875m的10个样品的磷灰石裂变径迹日期从3.30.3Ma到7.41.1Ma。这些年龄对应于整个东部喀喇昆仑州的模型平均侵蚀出土率0.67 + 0.27 / -0.18mm /年。其结果与从印度河缝线区向北，跨越拉达克地貌并进入喀喇昆仑山脉的趋势是一致的，在该趋势中，与地壳增厚相关的构造隆升向北增加，抬高了海拔，促进了冰川作用并产生了极端的地貌。结果，侵蚀和发掘率从南到北增加。另一方面，今天的降水在研究区域内变化不大，而在造山带的这一部分，西南到东北则有较大的减少。东部喀喇昆仑山脉的研究结果突显出，由于对西藏西部边缘碰撞的构造响应的区域变化，驱逐出土的方式多种多样。

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