Lithospheric Tectonics of a Transpressional Plate Boundary Fiordland, New Zealand

变形板块边界的岩石圈构造 新西兰峡湾

• 批准号: 9725187
• 负责人: Kevin Furlong
• 金额: $ 21.28万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-01-01 至 2001-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9725187&HistoricalAwards=false
• 关键词: Lithospheric; Tectonics; Transpressional; Plate; Boundary

9725187 Furlong Transpressional plate boundaries are zones of complicated crustal deformation. Many transpressional boundaries show partitioning of strain into concurrent convergent and relatively pure strike-slip deformation. While this strain partitioning is well documented in the crust of some areas, the way in which the lower crust and mantle deform is not well known. This collaborative study by Furlong at Penn State and Anderson at IGNS/Otago, New Zealand, will address this general question using the Fiordland area of SW New Zealand as a testing area. The specific problems that will be posed arc 1) how do the Pacific and Australian lithospheric accommodate shortening, and to what extent are the crust and mantel mechanically coupled? The approach will be two-fold. Furlong will undertake detailed modeling of the thermal, rheological, and deformational evolution of the area, and Anderson will undertake a seismological analysis of the area. The result of the analysis will reveal to what extent the crust and mantles are mechanically linked at this local, but they will also provide a critical context in which to generalize to other areas.

9725187跨压板块边界是复杂的地壳形变带。许多扭压边界显示，应变被分割成同时收敛的相对纯粹的走滑变形。虽然这种应变分离在一些地区的地壳中得到了很好的记录，但下地壳和地幔变形的方式并不是很清楚。宾夕法尼亚州立大学的Furlong和新西兰IGNS/Otago的Anderson进行了这项合作研究，将使用新西兰西南部的Fiordland地区作为试验区来解决这一普遍问题。将提出的具体问题是：1)太平洋和澳大利亚的岩石圈如何适应缩短作用，地壳和地幔的机械耦合程度如何？这种做法将是两方面的。福隆将对该地区的热、流变和变形演化进行详细的建模，安德森将对该地区进行地震学分析。分析的结果将揭示该地区地壳和地幔的机械联系程度，但它们也将提供一个关键背景，以便推广到其他地区。