岩石激增需要拉拉米德地质形成的两阶段模型
Joshua J Schwartz1, Jade Star Lackey2, Elena A Miranda3
1Department of Geological Sciences, California State University Northridge, Northridge, CA, 91330, USA. joshua.schwartz@csun.edu.
Nature communications
|June 29, 2023
概括
这就是拉拉米德的orogeny.
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
- 地质时间学 (Geochronology)
背景情况:
- 拉拉米德地质形成极大地塑造了北美西部的地质.
- 它的驱动机制仍在争论中,主要的模型涉及海洋高原碰撞和浅层沉降.
- 南加州巴托利斯 (SCB) 是理解这一事件的核心.
研究的目的:
- 为了研究拉拉米德orogeny的驱动机制.
- 为了确定精确的时间和持续时间magmatism,变形和变形在SCB.
- 挑战现有的高原低推和平板浮沉模型.
主要方法:
- 分析了来自南加州巴托利斯的280多个石和石Pb/U年龄的分析.
- 地质年代测定用于确定岩石,变形和变形时间线.
主要成果:
- 在SCB中发生的岩在9000万年至7000万年前之间发生了强烈的岩.
- 在这个时期,下层地是热的,在7500万年前后观察到冷却.
- 这些发现与早期拉拉米德变形所提出的高原压力和平板浮沉理论相矛盾.
结论:
- 拉拉米德矿产形成可能涉及一个两阶段的过程.
- 第一个阶段:SCB中的弧形"爆发"从90-75 Ma.
- 第二阶段:与海洋高原沉降相关的拉拉米德前陆地 (75-50万年前) 的随后的山脉形成阶段.
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