Continental Crustal Composition and Evolution: Constraints from Receiver Function Analysis

大陆地壳的组成和演化：接收函数分析的约束

• 批准号: 0440320
• 负责人: Stephen Gao
• 金额: --
• 依托单位: Kansas State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-01-01 至 2006-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0440320&HistoricalAwards=false
• 关键词: Continental; Crustal; Composition; Evolution; Constraints

The project is aimed at providing new or refined constraintson models of evolution and composition of the continental crust,by simultaneously measuring crustal thickness, Poisson's ratiowhich can be uniquely determined by the ratio between P and S-wavevelocities, and crustal P-wave velocities beneath about 200 broadbandseismic stations distributed all over the continents.About 80,000 source-normalized broadband seismograms will bevisually checked and used for the proposed study. A set of computercodes that the PIs developed to search for the optimal combinationof the three parameters beneath a station will be used for the study,and the bootstrap procedure will be used to estimatethe errors of the measurements. The existence of dipping Mohobeneath each of the stations will be examined. Another part ofthe project is for the collection of a set of published tectonichistory and petrological data obtained from lower crustal xenolithsor terrains related to the composition and evolution of the lower crustinthe vicinity of each of the stations. Those geological data willbe used for the interpretation of the seismological results.Expected results from the proposed work will be used bygeochemists, mineral physicists, and geodynamicists to address abroad range of important questions regarding the formation and evolutionof early crust and mantle. Thus this study should have an impact that isbeyond the seismological community.

该项目的目的是通过同时测量分布在各大洲的约200个宽带地震台站下的地壳厚度、泊松比（可由P波和S波速度之比唯一确定）和地壳P波速度，为大陆地壳的演化和组成提供新的或改进的约束模型。000个震源标准化宽带地震图将被目视检查并用于拟议的研究。 本研究将使用一套由PI开发的计算机程序来搜索一个台站下的三个参数的最佳组合，并将使用自助程序来估计测量的误差。将检查每个车站是否存在蘸水Mohobeneath。 该项目的另一部分是收集一套已发表的构造史和岩石学数据，这些数据是从与每个台站附近下地壳的组成和演变有关的下地壳捕虏体或地形中获得的。这些地质资料将用于解释地震学结果，地球化学家、矿物物理学家和地球动力学家将利用这些工作的预期结果来解决有关早期地壳和地幔的形成和演化的一系列重要问题。因此，这项研究的影响应该超越地震学界。