Collaborative Research: Lithospheric Structure and Evolution of the Rocky Mountains: Phase 2

该奖项继续为旨在了解落基山脉南部岩石圈构造演化的CD-ROM(落基山脉大陆动力学)合作调查提供资金。从怀俄明州到新墨西哥州的一条横断面提供了一个机会来评估这样一种假设，即西南部的岩石圈结构反映了早元古代大陆组装期间形成的构造和年轻的克拉通内构造作用期间发生的修改的可分辨混合物，这些构造本身受到元古代组成结构的影响。第一阶段(1997-2001年)成功地验证了这一假设。PI成像了夏延带和杰梅兹线；两者都被解释为古元古代古俯冲带，也显示了对年轻的克拉通内构造作用的长期和强烈的影响。两者也都与深部化学岩石圈的横向变化有关，因此地幔省可以与地壳省联系在一起，表明地幔过渡的古老。有了这笔“过渡性资金”，首席调查员将举办年度研讨会，完成对第一阶段产生的数据集的分析，提高发表论文的生产力，并为光盘项目第二阶段做准备。*

0207875HumphreysThis award provides continued funding for the CD-ROM (Continental Dynamics of the Rocky Mountains) collaborative investigation which is designed to understand the tectonic evolution of the lithosphere of the southern Rocky Mountains. A transect from Wyoming to New Mexico is providing an opportunity to evaluate the hypothesis that lithospheric architecture of the Southwest reflects a resolvable mixture of structures that formed during early Proterozoic assembly of the continent and modifications that took place during younger intracratonic tectonism that were themselves influenced by the Proterozoic compositional structure. Phase 1 (1997-2001) was successful in substantially verifying this hypothesis. The PIs imaged the Cheyenne Belt and Jemez lineament; both are interpreted to be Paleoproterozoic paleosubduction zones that also show long-lived and strong influence on younger intracratonic tectonism. Both are also associated with lateral changes in deep chemical lithosphere, such that the mantle provinces can be linked to crustal provinces, demonstrating the antiquity of the mantle transitions. With this "bridge funding" award, the Principal Investigators will conduct an annual workshop, complete the analysis of data sets generated in Phase 1, increase productivity in terms of published papers, and prepare for Phase 2 of the CD-ROM project.***