Lake Bonneville Uplift and a Fluid Lower Crust

博纳维尔湖隆起和流动的下地壳

• 批准号: 9118222
• 负责人: W. Morgan
• 金额: $ 6.12万
• 依托单位: Princeton University
• 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: 1992-10-01 至 1995-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9118222&HistoricalAwards=false
• 关键词: Lake; Bonneville; Uplift; Fluid; Lower

Recent numerical modeling of the Basin and Range extension process indicates that the lower crust must have a low viscosity in order for the Moho to remain flat, as required by seismic observation. Assuming this modeling is correct, the Lake Bonneville uplift should be re-examined with the goal of searching for earth models with low-viscosity lower crusts which satisfy the Lake Bonneville relict shoreline data. Preliminary modeling using an approximation to the Lake Bonneville load indicates that such models may successfully predict the Lake Bonneville uplift. The PI will examine a range of plausible low-viscosity lower-crustal earth models using a realistic model of Lake Bonneville and assuming linear viscoelastic rheologies. He will undertake finite- element modeling to incorporate such effects as power-law flow and an elastic-brittle upper crust. The modeling is significant because it may revise previous estimates of the upper-mantle viscosity beneath the Basin and Range, as well as indicate whether the Lake Bonneville uplift is compatible with the fluid lower crust required by other modeling.

盆地和山脉扩展的最新数值模拟 这一过程表明，下地壳必须具有低粘度 为了使莫霍面保持平坦， 观察. 假设这个模型是正确的，湖 邦纳维尔隆起应重新审视， 对于具有低粘度下地壳的地球模型， 邦纳维尔湖残余海岸线数据。 初步建模使用 对邦纳维尔湖负荷的近似值表明， 模型可以成功地预测邦纳维尔湖的隆起。 的 PI将检查一系列合理的低粘度下地壳 地球模型，使用真实的邦纳维尔湖模型， 假设线性粘弹性流变学。 他将承担有限的- 元素建模，以纳入幂律流动等效应， 一种弹性-脆性的上层地壳。 建模是重要的 因为它可能会修正先前对上地幔的估计 盆地和山脉下方的粘度，以及是否表明 邦纳维尔湖隆起与流体下地壳相容 其他模型所需的。