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

0607837 Dueker这个项目是一系列先前CD资助的落基山重点项目的后续行动，这些项目是在科罗拉多中部地幔中发现低速异常的基础上进行的。 拟议的项目涉及各种各样的技术，以解决所谓的“白杨异常”的原因，它的历史，及其对地壳演化的影响。 PI感兴趣的是地幔变化之间的联系，导致表面形貌的修改。 他们观察到，白杨异常位于落基山脉最高处的下方。 他们把低地幔地震速度与低地幔密度等同起来，从而导致隆起。 他们将调查该地区下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）由羽流引起，d）由熔体的存在引起。 这些都是大陆动力学的重要和相关问题。 具体而言，PI将使用：用途： - 被动地震学，使用层析成像、接收器功能更好地确定异常， 表面波和各向异性; - 地质研究（岩浆史、低温热年代学、构造 地貌学），以确定新生代构造和岩浆历史， 当前历史; - 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。

0607837DuekerThis 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 anisotropy; -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.