大巴山前陆构造带造山带流体的化学重磁化约束

To reveal the timeframe, distritubtion and migration of orogenic fluids is very important to understand the regional tectonic evolution and the hydrocarbon resources in the foreland basin. In China, this can be limited by the difficulty in constraining the precise timeframe and distribution of the fluids, often due to the multiple tectonic events. In the subject of paleogeomagnetism, the mechanism of chemical remagnetization is an important scientific problem, and the orogenic fluid is a popular mechanism invoked for many remagnetizations. Therefore, to establish the link between chemical remagnetization and the orogenic fluids is critical for both the mechanism of remagnetization and the time and distribution of orogenic fluids, and it is the key solution for this interdisciplinary problems. Daba Shan foreland fold and thrust belt represents a typical orogenic belt in China. To better understand the orogenic fluids of the Daba Shan belt is important，given the reasons of the multiple tectonic events and great oil-gas resources in its foreland basin. Based on the preliminary study in the Daba Shan belts, this program plans to conduct more interdisciplinary studies in order to establish the link between the chemical remagnetization and orogenic fluids and better understand the distribution and time of the fluids.

深入认识造山带流体的时代（期次）、分布及运移规律对于理解区域构造演化及分析前陆盆地油气资源分布具有极其重要的意义。对于我国常见的多期复杂构造活动区域，该项工作常常受限于对造山带流体期次和分布的精确约束。在古地磁领域，化学成因次生剩磁（化学重磁化）的产生机制同样也是重要的科学问题，而造山带流体活动是化学重磁化常见产生机制之一。确立造山带流体与化学重磁化之间的关联，既可以更好理解区域化学重磁化的机制，又可以用化学重磁化的可知时间信息和分布特征约束造山带流体的期次、分布和运移，是解决这一学科交叉共性难题的关键点。大巴山前陆构造带是我国典型的造山带，具有多期构造活动和前陆盆地内存在超大型油气资源分布的特征，深入分析造山带流体的时代和分布具有非常重要的意义。本项目拟在该区域，以前期工作为基础，进一步开展跨学科分析，以确立造山带流体与化学重磁化的关系，同时可以形成有关区域造山带流体时空特征的新认识。