在晚期甲布里亚时代对原型塔里姆盆地进行分析,以及其演变的动态机制
Haining Chang1, Guiting Hou1, Shaoying Huang2
1The Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing, China.
PloS one
|June 7, 2023
概括
塔里姆盆地是由新新生态时期的两个地形形成的,后来由于地幔羽毛和沉降而经历了裂变. 这项研究重建了其前坎布里亚时代的构造进化和裂系统.
科学领域:
- 地质科学 地质科学
- 构造学 构造学 构造学 构造学
- 古地质学 古地质学
背景情况:
- 塔里姆盆地的前坎布里亚时代构造演变对于理解其地质历史至关重要.
- 它是由新新生态时期 (1.0-0.8亿年前) 两个土壤的合并形成的.
- 随后的构造过程涉及罗丁亚破裂的地幔羽毛和来自Circum-Rodinia俯冲系统的压缩.
研究的目的:
- 为了重建原型盆地和塔林盆地在南华晚期和西尼时期的地质地图.
- 揭示塔里姆盆地的裂系统的特征和动态机制.
- 研究外围构造环境对裂演变的影响.
主要方法:
- 使用残余层厚度,钻探数据和石灰岩分布,重建原型盆地和构造地图.
- 对裂系统特征的分析,包括库鲁克塔格,阿克苏和蒂克利克地区的向分布.
- 应用一个三维弹性有限元素方法 (FEM) 模型来模拟古生物学压力场.
主要成果:
- 确定了两个主要的裂系统:北部边缘的后弓裂和南部边缘的水源系统.
- 裂的趋势各不相同:库鲁克塔格的北北向南,阿克苏的北北向南,蒂克利克的南北向南.
- FEM模型证实,裂演变是由外围构造力驱动的,包括南方沉积和北方地幔上升.
结论:
- 塔里姆盆地的前坎布里亚时代进化是复杂的,涉及地形合并,地幔羽毛活动和俯冲.
- 独特的裂系统是为了应对这些构造力而形成的.
- 这项研究提供了洞察力,了解了在前坎布里亚时期控制塔里姆盆地裂演变的动态机制.
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