俯冲动态和安第斯山脉和玻利维亚奥洛克林的起源
F A Capitanio1, C Faccenna, S Zlotnik
1School of Geosciences, Monash University, Clayton, 3800 Victoria, Australia. fabio.capitanio@monash.edu
Nature
|November 25, 2011
概括
安第斯山脉和玻利维亚的奥洛克林由于纳斯卡板块形成而形成.
科学领域:
- 地质地质地质地质地质地
- 构造学 构造学 构造学 构造学
- 地质物理学 地质物理学
背景情况:
- 安第斯山脉是由南美洲下方纳斯卡板块的沉降形成的.
- 安第斯山脉和玻利维亚奥洛克林山脉的形成仍然无法解释,尽管自中生代以来一直存在持续的沉降.
研究的目的:
- 为了研究安第斯山脉和玻利维亚黄石山脉的代形成背后的机制.
- 为了解释安第斯山脉的延迟发作.
主要方法:
- 使用了三维数值潜伏模型.
- 分析了纳斯卡板块板块厚度和沟中的年龄的变化.
- 检查了导致的上板厚度和应力分布.
主要成果:
- 纳斯卡板块在沟中的年龄变化造成了板块厚度的差异,导致了山脉形态.
- 侵蚀旧的纳斯卡板块使南美地变厚,解释了中央安第斯山脉更高的海拔.
- 板块的加厚改变了沟沿线的力量,形成的玻利维亚奥洛克林和应力带,负责安第斯山脉的宽度和各种构造风格.
结论:
- 安第斯山脉的orogeny和 orocline 形成与纳斯卡板块的年龄分布有关,这种情况在伊欧时代出现.
- 该模型成功地解释了观察到的安第斯形态,高度和奥洛克林的曲率.
- 这些发现解决了长期存在的安第斯山脉发育延迟开始的.
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