Collaborative Research: Intracontinental Deformation and Surface Uplift: Geodynamic Evolution of the Hangay Dome, Mongolia, Central Asia

合作研究：陆内变形和地表隆起：中亚蒙古杭爱圆顶的地球动力学演化

• 批准号: 1009721
• 负责人: C. Page Chamberlain
• 金额: $ 22.7万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1009721&HistoricalAwards=false
• 关键词: Collaborative; Research; Intracontinental; Deformation; Surface

Large relatively high-elevation surfaces with low relief are common onthe continents. Such uplifts have a significant impact on the geological record by influencing drainage networks and sediment supply, on climate by modifyingatmospheric circulation, and on biogeography and the biota. Work in geodynamics hasshown that such uplifts amount to a telling signature of mantle dynamics. Thus, theyprovide a means to discriminate among hypotheses about how the continental lithosphereand the deeper mantle interact through processes that result in uplift and mass transfer incontinental interiors. The Hangay Dome in central Mongolia provides an excellent andaccessible laboratory to investigate these processes and determine the degree to whichmantle upwelling, mafic underplating, lithospheric foundering or plume activity havebeen important agents in its uplift. This five-year project proposes to use the HangayDome as such a laboratory to coordinate studies of both the structure and state of thelithosphere and the sublithospheric mantle as well as the history of surface uplift andlandscape evolution. The project will involve observations and measurements made usingbroadband seismology, basalt and xenolith petrology and geochemistry, 40Ar/39Argeochronology, stable-isotope and vesicular-basalt paleoaltimetry, geomorphology and10Be geochronology, molecular genetics of divergent fish populations, and U-Th/He and4He/3He thermochronology. The Hangay Dome?s widespread exposures of basaltic lavas,which were erupted over the past 30 Ma across a broad range of elevations, will be key tothe integration of all these data. Dating of the basalts will enable linkage of petrologic databearing on basalt genesis and the nature of the Hangay-Dome mantle with studies thatuse the lavas as time markers for documenting landscape evolution and the history ofsurface uplift.

在大陆上很常见，相对较高的相对较高的表面很常见。这样的隆起通过影响排水网络和沉积物供应，通过修改趋势循环以及生物地理和生物群来影响地质记录。在地球动力学方面工作，这种提升的效果是地幔动态的讲述签名。因此，他们提供了一种歧视大陆岩石圈如何通过导致隆起和传质失禁内部的过程相互作用的假设之间的方法。蒙古中部的Hangay圆顶提供了一个非常可取的实验室，以研究这些过程，并确定上升，伪造，低调的，岩石圈的基础或羽状活性的程度使其上升的重要药物。这个五年的项目建议将HangayDome作为一个实验室来协调对thithosphere的结构和状态的研究，以及suphithosphetrichers的地幔以及表面隆起的历史和Landscape Evolution的历史。 The project will involve observations and measurements made usingbroadband seismology, basalt and xenolith petrology and geochemistry, 40Ar/39Argeochronology, stable-isotope and vesicular-basalt paleoaltimetry, geomorphology and10Be geochronology, molecular genetics of divergent fish populations, and U-Th/He and4He/3He thermochronology. 在过去30 mA中爆发的玄武岩熔岩的广泛暴露在广泛的海拔高度中，这将是所有这些数据的关键集成。 玄武岩的日期将使质质数据库在玄武岩创世纪和Hangay-dome地幔的性质上进行连接，并将熔岩作为记录景观进化和表面升高历史的时间标记。