Thermochronological and structural investigation accompanying LEGENDS: I - The morpho-tectonic evolution of Sri Lanka

传说中的热年代学和结构调查：I - 斯里兰卡的地貌构造演化

• 批准号: 16174513
• 负责人: Professor Dr. Frank Lisker
• 金额: --
• 依托单位: Fachgebiet Geodynamik der Polargebiete
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/16174513?language=en
• 关键词: Thermochronological; structural; investigation; accompanying; LEGENDS

The Phanerozoic geological evolution of Sri Lanka is poorly constrained since no tectonic and/or igneous processes are recorded, and no large-scale "Gondwanan" sedimentary deposits are preserved. To overcome this deficiency, our study will apply low-temperature thermochronological methods (fission track/ FT and (U-Th)/He analysis) and structural investigations along the transect of the deep seismic LEGENDS traverse across Sri Lanka. This approach links the upper crustal cooling/ denudation pattern with the structure of the crust beneath, allowing a detailed quantification and genetic interpretation of the regional Phanerozoic geological history and long-term landscape evolution. Specific topics of the project are (1) the long-term development of the topography; (2) the course of the Gondwana breakup between Madagascar,.India, Sri Lanka and East Antarctica, and the subsequent evolution of the Sri Lanka continental margins; (3) the dating of tectonic activities and their influence on denudation; (4), the establishment of the paleogeothermal gradient; (5) the deposition of Gondwana sediments in Sri Lanka, and the evolution of the respective basin; and (6) the analysis of the regional fault pattern.

由于没有记录构造和/或火成点过程，因此斯里兰卡的Phanerozoic地质演变受到限制，并且没有保留大规模的“ Gondwanan”沉积沉积物。为了克服这一缺陷，我们的研究将采用低温热量学方法（裂变轨迹/ ft和（u-th）/ HE分析）和沿着深层地震传说在整个斯里兰卡的横断面的横切。这种方法将上地壳冷却/剥离模式与下面的地壳结构联系起来，从而允许对区域phanerogiac地质历史和长期景观演化的详细定量和遗传解释。该项目的具体主题是（1）地形的长期发展； （2）马达加斯加，.india，斯里兰卡和南极洲东部的冈瓦纳分手以及后来的斯里兰卡大陆边缘的演变； （3）构造活动的日期及其对剥离的影响； （4），建立了古代地热梯度； （5）斯里兰卡冈瓦纳沉积物的沉积以及各个盆地的演变； （6）区域断层模式的分析。

项目成果

Thermochronological dating of brittle structures in basement rocks: A case study from the onshore passive margin of SW Sri Lanka

• DOI: 10.1029/2012jb009136
• 发表时间: 2012-10
• 期刊: Journal of Geophysical Research
• 作者: B. Emmel;F. Lisker;T. Hewawasam