Development of 1.9 Ga Bear Creek Foredeep on Thermally YoungLithosphere

热年轻岩石圈上 1.9 Ga Bear Creek 前深部的发育

• 批准号: 8806090
• 负责人: John Grotzinger
• 金额: --
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-02-15 至 1991-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8806090&HistoricalAwards=false
• 关键词: Development; 1.9; Ga; Bear; Creek

The proposed research will examine the possibility that Bear Creek Foredeep evolved on thermally young continental lithosphere as a result of collapse of an immature passive continental margin. Research will involve an integrated approach, combining geological and geochronological field investigations of selected areas with geophysical modelling of related gravity anomalies the Thelon Tectonic Zone (infered suture) and two-dimensional modelling of the basin - Thelon Zone system. Models will be used to make first-order predictions concerning basin geometry and stratigraphic architecture of basins formed on cold vs. warm lithosphere. The models will then be compared to the observed characteristics of Bear Creek Foredeep as a method of evaluating the thermal condition of the lithosphere during basin development. Evaluating the thermal age of the lithosphere during subsidence of Bear Creek Foredeep constitutes a critical test of the hypothesis that passive continental margins may have been, on the average, more short-lived than in younger times (cf. Hoffman and Bowring, 1984).

拟议的研究将研究熊溪（Bear Creek）Foredeep由于未成熟的被动大陆边缘崩溃而在热年轻的大陆岩石圈上进化的可能性。 研究将涉及一种综合方法，将所选区域的地质和地质田间研究与相关重力异常的地球物理模型相结合，thelon构造区（推断的缝合线）和盆地 - 瑟隆区系统的二维建模。 模型将用于制作有关冷岩石圈与温暖岩石圈形成的盆地几何形状和地层结构的一阶预测。 然后，将将模型与贝尔克里克（Bear Creek）的观察到的特征进行比较，作为评估盆地发育过程中岩石圈热条件的一种方法。 评估Bear Creek ForeDeep沉降期间岩石圈的热年龄构成了对被动大陆边缘的假设的批判性检验，即被动大陆边缘的平均水平可能比年轻时更短（参见Hoffman and Bowring，1984年）。