Collaborative Research: Colorado Rockies Experiment and Seismic Transects (CREST): Time-space Patterns of Cenozoic Uplift-magmatism and their Correspondence to the Aspen Anomaly

合作研究：科罗拉多落基山脉实验和地震断面（CREST）：新生代隆升岩浆作用的时空模式及其与阿斯彭异常的对应

基本信息

批准号：
0607808
负责人：
Karl Karlstrom
金额：
$ 25.02万
依托单位：
University of New Mexico
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：
2006-11-01 至 2012-04-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0607808&HistoricalAwards=false
关键词：
Collaborative Research Colorado Rockies Experiment

项目摘要

0607808KarlstromThis project is a follow up to a series of previous CD funded Rocky Mountain focused projects building on the discovery of a low velocity anomaly in the mantle beneath central Colorado. The proposed project involves a wide variety of techniques assembled to address the cause of the so called "Aspen anomaly", its history, and its effect on crustal evolution. The PIs are interested in the connection between changes in the mantle causing modification of surface topography. They have observed that the Aspen anomaly is located beneath the highest portion of the Rocky Mountains. They equate low mantle seismic velocities with low mantle densities to cause uplift. They will investigate whether the very large velocity variations in the mantle beneath this area are: a) in the lithosphere or asthenosphere, b) reflect Proterozoic lithospheric sutures reactivated by Cenozoic tectonism, c) are caused by a plume, and d) are caused by the presence of melt. These are all important and relevant questions for Continental Dynamics. Specifically, the PIs will use: - passive seismology to better define the anomaly using tomography, receiver functions, surface waves, and anisotrophy;- geological studies (magmatic history, low temperature thermochronology, tectonic geomorphology) to identify Cenozoic tectonic and magmatic history to define long term and current history;- geodynamical models of topography uplift and mantle processes to study their connection.

0607808Karlstrom 该项目是一系列先前 CD 资助的落基山重点项目的后续项目，这些项目的基础是发现科罗拉多州中部地幔中的低速异常。拟议的项目涉及多种技术，旨在解决所谓的“阿斯彭异常”的原因、其历史及其对地壳演化的影响。 PI 感兴趣的是地幔变化导致地表地形改变之间的联系。他们观察到阿斯彭异常位于落基山脉最高部分的下方。他们将低地幔地震速度等同于低地幔密度，从而导致隆起。他们将调查该区域下方地幔中非常大的速度变化是否是：a）在岩石圈或软流圈中，b）反映了新生代构造作用重新激活的元古代岩石圈缝合线，c）是由羽流引起的，d）是由熔化物的存在。这些对于大陆动力公司来说都是重要且相关的问题。具体而言，PI 将使用： - 被动地震学，利用断层扫描、接收器函数、表面波和各向异性更好地定义异常； - 地质研究（岩浆历史、低温热年代学、构造地貌学），以确定新生代构造和岩浆历史，以定义长期和当前的历史；- 地形隆起和地幔过程的地球动力学模型，以研究它们之间的联系。