尼泊尔中部卡利甘达基大喜马拉雅山层序掘起史的构建

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of the Geological Society Pub Date : 2023-12-12 DOI:10.1144/jgs2023-100
Alexandra E. Pye, K. Hodges, Todd A. Ehlers, M. V. van Soest, Christopher S. McDonald, Basant Bhandari
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引用次数: 0

摘要

要了解喜马拉雅造山带的演化,就必须了解藏南断裂系统(STDS)在时间和空间上是如何演化的。我们展示了卡利甘达基地区藏南断裂系统基底构造--安纳普尔纳断裂--底壁和韧性剪切带横断面的最新(以及之前发表的)热年代学结果。通过使用一维热运动学模型对样品的掘起速率进行反演,根据观测结果对掘起历史进行了解释。最近公布的数据表明,该脱离体的高温滑动至少持续到约12Ma,比通常认为的更晚。12Ma,比一般认为的STDS变形时间更晚。我们的新数据和建模支持这些发现,并表明滑动的停止与剪切带及其底壁在约12-10Ma的掘起速率的急剧下降相吻合,降幅大于50%。12-10 Ma。在大约3Ma之前,掘出率一直很低,之后掘出率上升到与STDS活动特征相当的水平。造成这种晚期掘起现象的可能原因包括亚洲冬季季风的加强和今天印度夏季季风的形成、冰川作用和/或喜马拉雅造山楔的内部结构重组导致腹地局部岩石隆起。 补充材料:https://doi.org/10.6084/m9.figshare.c.6949467
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Constraining the exhumation history of the Greater Himalayan sequence, Kali Gandaki, Central Nepal
Understanding how the South Tibetan Detachment System (STDS) evolved through time and space is necessary for understanding the evolution of the Himalayan orogen. We present new (with previously published) thermochronologic results from a transect in the footwall and ductile shear zone of the basal structure of the STDS in the Kali Gandaki region: the Annapurna detachment. The exhumation history is interpreted from observations using 1D thermal-kinematic models that invert for the exhumation rate of samples. Recently published data suggested that high-temperature slip on the detachment persisted until at least ca. 12 Ma, more recently than is commonly assumed for STDS deformation. Our new data and modelling support those findings and suggest that the cessation of slip coincided with a dramatic, > 50% decrease in the exhumation rate of the shear zone and its footwall at ca. 12-10 Ma. Exhumation rates remained low until ca. 3 Ma, after which they increased to levels comparable with those that characterised STDS activity. Plausible causes of this late pulse of exhumation include an intensification of the Asian Winter monsoon and establishment of today's Indian Summer Monsoon, glaciation, and/or an internal structural reorganisation of the Himalayan orogenic wedge driving localised rock uplift in the hinterland. Supplementary material: https://doi.org/10.6084/m9.figshare.c.6949467
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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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