Collaborative Research: Seismic, Magnetotelluric, Structuraland Petrological Studies of the Crust in Eastern Nevada to Constrain Fluid Content and Crustal Evolution

合作研究：对内华达州东部地壳进行地震、大地电磁、结构和岩石学研究，以限制流体含量和地壳演化

• 批准号: 9118378
• 负责人: Roy Johnson
• 金额: $ 20.14万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-07-15 至 1996-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9118378&HistoricalAwards=false
• 关键词: Collaborative; Research; Seismic; Magnetotelluric; Structuraland

Multicomponent seismic reflection, magnetotelluric, structural, and petrological studies of Basin-and-Range crust will be performed to study problems of fluids in the crust including magma at the Moho, crustal inflow beneath uplifted core complexes, underplating, mid-crustal detachment zones, anisotropy, and nature of lower crust. Structural plunge of the Ruby Mountains core complex, producing greater than 10 km difference in level of exposure, offers a particularly good setting to study these problems. The combination of S-waves as well as P-waves together with conductivity in the deep crust provides a good opportunity to constrain various possibilities suggested for Basin-and-Range crust, especially because seismic and MT results complement each other in explaining conductive zones. Data acquisition involving about 1550 seismic channels is designed to optimize S-wave data for maximum resolution, and the question of resolution in seismic and MT interpretation is a major consideration in developing conclusions. Models obtained from geophysical interpretation will be integrated with petrology and structure.

将进行盆山地壳的多分量地震反射、大地电磁、构造和岩石学研究，以研究地壳中的流体问题，包括莫霍面的岩浆、隆起的核杂岩下的地壳流入、底侵、中壳滑脱带、各向异性和下地壳的性质。红宝石山脉核心复合体的构造俯冲，造成暴露水平差异超过10公里，为研究这些问题提供了特别好的环境。S波和P波与地壳深部电导率的组合为限制盆山地壳的各种可能性提供了一个很好的机会，特别是因为地震和大地电磁结果在解释导电带方面是相辅相成的。涉及约1,550个地震道的数据采集旨在优化S波数据以获得最大分辨率，而地震和大地电磁解释中的分辨率问题是得出结论的主要考虑因素。通过地球物理解释获得的模型将与岩石学和构造相结合。