Are Remnants of the Tibetan Plateau Preserved in the Southern Himalayan Thrust Belt?
喜马拉雅南冲断带是否还保留着青藏高原的遗迹?
基本信息
- 批准号:1763432
- 负责人:
- 金额:$ 46.98万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2018
- 资助国家:美国
- 起止时间:2018-08-01 至 2023-07-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The Himalaya of Nepal is one of Earth's most rugged and rapidly eroding landscape, with local relief greater than 5,000 meters and a morphology dominated by deep fluvial incision. This regional pattern of relief is broken in western Nepal, where the Bhumichula plateau represents a approximately 250 square kilomter area of low-relief (200-400 meters), but high-elevation (4200-4800 meters) ground isolated amidst surrounding deeply incised topography resembling that of Tibet. This projects investigates how and when the Bhumichula plateau formed. Determining whether the Bhumichula plateau formed as a low-elevation surface that was later uplifted and incised, or whether it was high standing from its earlier stages and part of a larger Tibetan plateau and was later modified by surface processes, is significant for the understanding of the mechanisms forming high topography on Earth. High elevation features such as the Himalaya and Tibet are a product of tectonic processes over geological time, which are responsible today for the location and magnitude of earthquakes. The Himalayas and Tibet also play a significant role on climate by driving the Asian monsoon and thus control the distribution of fresh water on our planet. Important societal outcomes deriving from this project include training of graduate students This project also supports the training of graduate and undergraduate students in an important science, technology, engineering and mathematics discipline (STEM), thereby contributing to the increased economic competitiveness of the United States. The project also contributes to the broadening of underrepresented groups in STEM, thereby promoting diversity in science. and minorities, female research scientists, and promotes diversity in science. It also is supporting the development of an online virtual field trip experiences for general education and upper division classes.This is a muldisciplinary invesgation that uses geological mapping, low-temperature thermochronology, cosmogenic nuclide dating, geomorphological analysis, stable isotope paleoaltimetry, and 40Ar/39Ar geochronology to determine the age of basement rocks, the timing of deformation, erosion/incision and uplift of the Bhumichula plateau in western Nepal. Although other low-relief, high-elevation surfaces have been identified in the Himalaya, none has been investigated with the complete array of methods to be employed in this work. A principal goal of the project is to establish a workflow for how to analyze and interpret these low-relief surfaces in general, which are common features in the Himalaya to the east of Nepal. This study is the first attempt to apply such a wide array of techniques to unravel the history of landscape development in the India-Asia collisional environment, including the first attempt to determine paleoelevation on the southern slope of the Himalaya. Three main hypotheses will be tested: (1) BP formed as a low-elevation surface that was uplifted to high elevation and incised by antecedent and headward eroding rivers; (2) the BP is a remnant of a once much larger paleo-Tibetan landscape that reached nearly to the front of the Himalaya during the Miocene, and has been etched northward by headward erosion since that time; and (3) the BP formed in response to drainage reorganization and feedbacks between drainage area, erosion, and elevation.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
尼泊尔的喜马拉雅山是地球上最崎岖和侵蚀最快的景观之一,局部地形超过5,000米,地形主要是深河流切割。这种区域性的地形在尼泊尔西部被打破,在那里,Bhumichula高原代表了一个大约250平方公里的低地形(200-400米),但高海拔(4200-4800米)的地面孤立在周围深深切割的地形中,类似于西藏。该项目调查了Bhumichula高原是如何以及何时形成的。确定布米库拉高原是否形成为一个低海拔表面,后来被抬升和切割,或者它是否从早期阶段就处于高位,是更大的青藏高原的一部分,后来被表面过程改造,对于了解具有重要意义。地球上形成高地形的机制。喜马拉雅山和西藏等高海拔地区是地质时期构造过程的产物,这些构造过程决定了今天地震的位置和震级。喜马拉雅山脉和西藏也通过驱动亚洲季风对气候起着重要作用,从而控制着我们星球上淡水的分布。该项目产生的重要社会成果包括培养研究生。该项目还支持培养一个重要的科学、技术、工程和数学学科(STEM)的研究生和本科生,从而为提高美国的经济竞争力做出贡献。该项目还有助于扩大STEM中代表性不足的群体,从而促进科学的多样性。 和少数民族,女性研究科学家,并促进科学的多样性。这是一项多学科的研究,利用地质填图、低温热年代学、宇宙成因核素测年、地貌分析、稳定同位素古高度学和40 Ar/39 Ar地质年代学来确定基底岩石的年龄、变形的时间、尼泊尔西部Bhumichula高原的侵蚀/切割和隆起。虽然在喜马拉雅山也发现了其他低起伏、高海拔的地表,但没有一个是用本工作所采用的一整套方法进行调查的。 该项目的一个主要目标是建立一个工作流程,以分析和解释这些低起伏表面,这是尼泊尔东部喜马拉雅山脉的共同特征。这项研究是第一次尝试应用这样一个广泛的技术来解开印度-亚洲碰撞环境中的景观发展的历史,包括首次尝试确定喜马拉雅山南坡的古海拔。本文将检验三个主要假设:(1)BP是由一个低海拔的表面形成的,它被抬升到高海拔,并被先行的和溯源的侵蚀河流切割;(2)BP是一个曾经大得多的古西藏景观的残余,在中新世期间几乎到达喜马拉雅山的前面,并从那时起被溯源的侵蚀向北侵蚀;和(3)BP形成的排水重组和反馈之间的排水面积,侵蚀,海拔。这个奖项反映了NSF的法定使命,并已被认为是值得通过评估使用基金会的智力价值和更广泛的影响审查标准的支持。
项目成果
期刊论文数量(3)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Coupled Rapid Erosion and Foreland Sedimentation Control Orogenic Wedge Kinematics in the Himalayan Thrust Belt of Central Nepal
- DOI:10.1029/2020jb021256
- 发表时间:2021-03
- 期刊:
- 影响因子:0
- 作者:P. DeCelles;B. Carrapa
- 通讯作者:P. DeCelles;B. Carrapa
Glacial and fluvial erosion in the Dolpo Basin, Western Nepal
- DOI:10.1016/j.geomorph.2020.107033
- 发表时间:2020-04
- 期刊:
- 影响因子:3.9
- 作者:Rhys E. Buceta;L. Schoenbohm;P. DeCelles
- 通讯作者:Rhys E. Buceta;L. Schoenbohm;P. DeCelles
Bhumichula plateau: A remnant high-elevation low-relief surface in the Himalayan thrust belt of western Nepal
布米楚拉高原:尼泊尔西部喜马拉雅冲断带残留的高海拔低地势地表
- DOI:10.1130/b36481.1
- 发表时间:2022
- 期刊:
- 影响因子:0
- 作者:Sherpa, Tshering Z.L.;DeCelles, Peter G.;Carrapa, Barbara;Schoenbohm, Lindsay M.;Wolpert, Joshua
- 通讯作者:Wolpert, Joshua
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Peter DeCelles其他文献
Peter DeCelles的其他文献
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{{ truncateString('Peter DeCelles', 18)}}的其他基金
Collaborative Research: Tectonic Significance of Long Run-Out Coarse-Grained Facies in the Cordilleran Foreland Basin
合作研究:科迪勒拉前陆盆地长程粗粒相的构造意义
- 批准号:
1524151 - 财政年份:2015
- 资助金额:
$ 46.98万 - 项目类别:
Continuing Grant
Erosion and Exhumation History of the Nepalese Frontal Himalaya Since Earliest Miocene Time: Constraints on Kinematic History
尼泊尔前缘喜马拉雅山自最早中新世以来的侵蚀和剥露历史:对运动学历史的限制
- 批准号:
1140068 - 财政年份:2012
- 资助金额:
$ 46.98万 - 项目类别:
Continuing Grant
One Year Renewal Request: Investigation of Syncollisional Extension and Basin Development in the High Himalaya
一年续约请求:喜马拉雅高山同步碰撞延伸和盆地发育调查
- 批准号:
0836751 - 财政年份:2009
- 资助金额:
$ 46.98万 - 项目类别:
Standard Grant
Collaborative Research: Stratigraphic Signatures of Orogeny: Assessing the Timing of Initial Andean Crustal Shortening
合作研究:造山运动的地层特征:评估安第斯地壳初始缩短的时间
- 批准号:
0710679 - 财政年份:2007
- 资助金额:
$ 46.98万 - 项目类别:
Continuing Grant
Collaborative Research: Investigation of Syncollisional Extension and Basin Development in the High Himalaya
合作研究:喜马拉雅高山同步碰撞伸展和盆地发育调查
- 批准号:
0438115 - 财政年份:2005
- 资助金额:
$ 46.98万 - 项目类别:
Continuing Grant
Collaborative Research: A Test of the Out-of-Sequence Model for the Main Central Thrust, Western Nepal
合作研究:尼泊尔西部主要中央冲断层失序模型的测试
- 批准号:
0207179 - 财政年份:2002
- 资助金额:
$ 46.98万 - 项目类别:
Standard Grant
COLLABORATIVE RESEARCH: 3-D Kinematic Evolution of the Charleston-Nebo Salient, Sevier Fold-Thrust Belt
合作研究:查尔斯顿-内波凸出区、塞维尔褶皱逆冲带的 3-D 运动学演化
- 批准号:
9903105 - 财政年份:1999
- 资助金额:
$ 46.98万 - 项目类别:
Standard Grant
Nd Isotopic Study of Foreland Basin Sediments and Source Terranes of the Himalayan Fold-Thrust Belt: Implications for Regional Tectonic History
喜马拉雅褶皱冲断带前陆盆地沉积物和物源地体的 Nd 同位素研究:对区域构造历史的启示
- 批准号:
9814060 - 财政年份:1999
- 资助金额:
$ 46.98万 - 项目类别:
Standard Grant
Collaborative Research: Late Cretaceous-Tertiary Foreland Basin Evolution in the Eastern Cordillera of Southern Bolivia
合作研究:玻利维亚南部东科迪勒拉山脉晚白垩世-第三纪前陆盆地演化
- 批准号:
9804680 - 财政年份:1998
- 资助金额:
$ 46.98万 - 项目类别:
Standard Grant
Kinematic History of a Retroarc Fold-Thrust Orogen: Sevier Orogenic Belt, Utah and Wyoming
弧后褶皱逆冲造山带的运动史:塞维尔造山带,犹他州和怀俄明州
- 批准号:
9526991 - 财政年份:1996
- 资助金额:
$ 46.98万 - 项目类别:
Standard Grant
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