Collaborative Research: Lithospheric Dynamics in the Southernmost Andean Plateau

合作研究：安第斯高原最南端的岩石圈动力学

• 批准号: 0538112
• 负责人: Suzanne Kay
• 金额: --
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-10-01 至 2010-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0538112&HistoricalAwards=false
• 关键词: Collaborative; Research; Lithospheric; Dynamics; Southernmost

0538112KayCollaborative Research: Lithospheric Dynamics in the Southernmost Andean Plateau We will address the fundamental questions on the processes that form, modify and destroy continental lithosphere and control lithospheric dynamics along Andean-type continental margins through a collaborative international passive-source seismic experiment in the southern Puna of the central Andean plateau. The southern Puna (25 degrees S to 28 degrees S) is not only key to understanding Andean evolution, it is also the type locale for testing the delamination hypothesis for removal of thickened eclogitic continental crust along with continental mantle lithosphere. Such crustal removal provides an explanation for the near absence of a dense mafic root in many orogenic regions (including the central Andean plateau to the north) as well as the equally, if not more important, bulk andesitic composition of the continental crust. We here propose to acquire the detailed geophysical data needed to test whether current lithospheric structure is compatible with this process, as well as to fill in a critical gap in modern geophysical coverage along strike in a distinctive part of the central Andean plateau.This project will involve deploying a total of 25 broadband and 45 intermediate-period three component seismic stations and employing a number of new and well-established techniques to image the details of the lithospheric seismic velocity structure and local seismicity patterns. This is a truly international project in that it will benefit from the participation of scientists from the U.S., Germany, and South America. The images will be integrated with the regional geology and the geochemical signature of relevant volcanism to form a robust geodynamic model for the evolution of the central Andean mountain belt. We intend to study mantle dynamics and mantle flow associated with slab lithosphere using a combination of seismic tomographic methods (surface wave, body wave, and attenuation) as well as the large volume of prior geologic studies in this region to help constrain the extent, timing and amount of lithospheric removal within the southern Puna plateau. This work will train a number of American, German, and Argentine students in modern seismological data acquisition and processing. The study will contribute to improved understanding of the broader aspects of the earthquake and volcanic hazards in the Andes which have devastating potential, as well as the origin of natural resources in this classic mineral terrane. Lastly, this study serves as a forerunner and geodynamic reference for planned EARTHSCOPE investigations of older, comparable orogenic systems in the western U.S.

0538112 KayCollaborative Research：Lithospheric Dynamics in the Southernmost Andean Plateau我们将通过在安第斯高原中部普纳南部进行的国际合作被动震源地震实验，探讨形成、改变和破坏大陆岩石圈以及控制沿着安第斯型大陆边缘岩石圈动态的过程的基本问题。普纳南部（南纬25度至28度）不仅是理解安第斯山脉演化的关键，也是检验增厚的榴辉岩大陆地壳沿着大陆地幔岩石圈移动的拆沉假说的典型地点。这种地壳的移动解释了为什么在许多造山区（包括北部的安第斯高原中部）几乎没有致密的镁铁质根，以及同样，如果不是更重要的，大陆地壳的大块安山岩组成。 我们在这里建议获取详细的地球物理数据，以测试当前的岩石圈结构是否与这一过程相适应，以及填补安第斯高原中部一个独特部分沿走向沿着现代地球物理覆盖的一个关键空白。该项目将涉及部署总共25个宽带和45个中期三分量地震台站，并采用一些新的、性能良好的地震台站，建立了对岩石圈地震速度结构和当地地震活动模式的细节进行成像的技术。 这是一个真正的国际项目，因为它将受益于来自美国，德国和南美洲。 这些图像将与区域地质和有关火山活动的地球化学特征相结合，形成一个可靠的安第斯山脉中部地带演变地球动力学模型。 我们打算研究地幔动力学和地幔流动与板状岩石圈相结合的地震层析成像方法（面波，体波，衰减），以及大量的先前的地质研究，在这个地区，以帮助限制的范围内，时间和数量的岩石圈去除南部普纳高原。这项工作将培训一些美国，德国和阿根廷的学生在现代地震数据采集和处理。 这项研究将有助于更好地了解安第斯山脉具有破坏潜力的地震和火山灾害的更广泛方面，以及这一典型矿藏的自然资源来源。最后，这项研究作为一个先行者和地球动力学的参考计划EARTHSCOPE调查的旧的，可比的造山系统在美国西部。