格陵兰岛东部的旧碎屑AFT年龄不需要高原侵蚀

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Matthew Fox, Vivi Pedersen
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引用次数: 0

摘要

为了可靠地重建过去的冰盖以推断古气候,需要对过去地形进行准确的估计。因此,了解东格陵兰岛的侵蚀率对于限制由构造和气候依赖的侵蚀率驱动的景观演变至关重要。在这里,我们分析了已发表的磷灰石裂变径迹(AFT)数据,以约束AFT基岩年龄在整个景观中的空间格局。我们将这些基岩年龄与已公布的碎屑分布进行比较,以突出侵蚀模式的模糊性。与早期的工作相反,我们通过基岩年龄回归了一个简单的挖掘速度模型,这样年龄就可以作为海拔和位置的函数而变化。所得等年龄面使我们能够确定碎屑AFT年龄分布的潜在源区。我们发现,在碎屑分布中观察到的年龄,可能来自远离海岸的低海拔地区,也可能来自靠近海岸的高海拔地区。因此,需要来自低温系统的额外数据,才能对该地区的景观演变做出确凿的结论,并区分两种景观形成情景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Old detrital AFT ages from E. Greenland do not require plateau erosion
Accurate estimates of past topography are required to reliably reconstruct past ice sheets to infer paleoclimate. For this reason, understanding erosion rates across East Greenland is crucial to constrain landscape evolution driven by tectonics and climate-dependent erosion rates. Here we analyse published apatite fission track (AFT) data to constrain the spatial pattern of AFT bedrock ages across the landscape. We compare these bedrock ages with published detrital distribution to highlight ambiguity in the pattern of erosion. In contrast to earlier work, we regress a simple model of exhumation pace through the bedrock ages such that age can vary both as a function of elevation and position. The resulting iso-age surfaces enable us to determine potential source areas for detrital AFT ages distributions. We find that old ages observed in detrital distributions are just as likely to be sourced from low-elevation locations that are far from the coast, as high elevation locations close to the coast. Additional data from lower temperature systems are thus required to make firm conclusions on landscape evolution in the region and distinguish between the two landscape-forming scenarios.
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来源期刊
Journal of the Geological Society
Journal of the Geological Society 地学-地球科学综合
CiteScore
6.00
自引率
3.70%
发文量
68
审稿时长
6-12 weeks
期刊介绍: Journal of the Geological Society (JGS) is owned and published by the Geological Society of London. JGS publishes topical, high-quality recent research across the full range of Earth Sciences. Papers are interdisciplinary in nature and emphasize the development of an understanding of fundamental geological processes. Broad interest articles that refer to regional studies, but which extend beyond their geographical context are also welcomed. Each year JGS presents the ‘JGS Early Career Award'' for papers published in the journal, which rewards the writing of well-written, exciting papers from early career geologists. The journal publishes research and invited review articles, discussion papers and thematic sets.
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