SGER: The effect of pressure on the strength of olivine aggregates

SGER：压力对橄榄石聚集体强度的影响

• 批准号: 0624993
• 负责人: Basil Tikoff
• 金额: $ 1.99万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-06-01 至 2007-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0624993&HistoricalAwards=false
• 关键词: SGER; effect; pressure; strength; olivine

Accurate information on the deformation mechanisms, microstructures and flow laws of thelithospheric mantle is crucial for appropriate interpretations of seismic anisotropy as well asaccurate predictions of lithospheric strength. Laboratory experiments are critical for identifying thedeformation mechanisms operative over the range of upper mantle conditions, and quantifying theflow laws, lattice preferred orientations (LPOs) and microstructural piezometer relations. The investigators' preliminary high pressure general shear experiments on olivine aggregates, using a molten salt cell, do not agree with observations from previous studies in several important ways. In the SGER grant, they will perform additional experiments and analyses to try to resolve the discrepancies in the strength of high pressure samples and LPOs and recrystallized grain size piezometer relations. The Broader Impacts of the work include support for a post-doc who will be able to work with researchers at University of Wisconsin-Madison and Brown University. The results of this study are of great importance to researchers in seismology, geodynamics and tectonics, in addition to the rock deformation community.

岩石圈地幔的变形机制、微观结构和流动规律的准确信息对于正确解释地震各向异性以及准确预测岩石圈强度至关重要。实验室实验对于确定上地幔条件范围内的变形机制，量化流动规律、晶格择优取向（LPOs）和显微结构压力计关系至关重要。研究人员使用熔盐电池对橄榄石聚集体进行的初步高压一般剪切实验在几个重要方面与先前研究的观察结果不一致。在SGER赠款中，他们将进行额外的实验和分析，以试图解决高压样品和LPO的强度差异以及再结晶晶粒尺寸压力计关系。这项工作的更广泛影响包括支持一名博士后，他将能够与威斯康星大学麦迪逊分校和布朗大学的研究人员合作。研究结果对地震学、地球动力学、构造学以及岩石变形研究都具有重要意义。