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: 0538245
• 负责人: Eric Sandvol
• 金额: $ 32.25万
• 依托单位: University of Missouri-Columbia
• 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 2013-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0538245&HistoricalAwards=false
• 关键词: Collaborative; Research; Lithospheric; Dynamics; Southernmost

0538245SandvolCollaborative 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.

0538245 SandvolCollaborative研究：安第斯高原最南端的岩石圈动态我们将通过在安第斯型大陆界沿着岩石层进行岩石圈的岩石圈，通过协作的国际被动的Seismiss Seismiss Seister-Southern unternal Plata和Southern internall andean plata in Centernal和Southern Plata的岩石圈动力学来解决基本问题。南部的Puna（25度至28度）不仅是理解安第斯进化的关键，而且还是测试分层假设的类型语言环境，用于去除厚厚的Eclogitic Continental Croust以及大陆地幔岩石圈。这种地壳去除提供了一种解释，即几乎没有造型区域（包括北部安第斯山脉中部高原）以及同样（即使不是更重要的，大陆壳的宽大的安第斯山脉组成）的解释。 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岩石圈地震速度结构和局部地震行为模式。 这是一个真正的国际项目，它将受益于美国，德国和南美的科学家的参与。 这些图像将与区域地质学和相关火山的地球化学特征融为一体，以形成一个强大的地球动力模型，以构成中央安第斯山带的演变。 我们打算使用地震层析成像方法（表面波，身体波和衰减）以及该地区的大量先前地质研究来帮助限制层次，有助于限制层次，时间和岩石圈在南部南部南部南部的岩石圈去除的程度和量，以研究与平板岩石圈相关的地幔动态和地幔流。这项工作将培训许多美国，德语和阿根廷学生，以获取现代地震学数据获取和处理。 这项研究将有助于提高对具有毁灭性潜力的安第斯山脉中地震和火山危害的更广泛方面的理解，以及在这个经典的矿物地形中自然资源的起源。最后，这项研究是对美国西部较旧的，可比较的造型系统的计划的地球学调查的先驱和地球动力学参考。