概括
加利福尼亚的早期米奥森双模火山活动是东太平洋起山脊-沟沟相互作用的结果. 火山岩起源于一个枯竭的地幔源,并与当地的地下岩石同化形成岩石和岩石.
科学领域:
- 地质地质地质地质地质地质
- 火山学 火山学是一门学科.
- 板块构造学是一种板块构造学.
背景情况:
- 双模火山活动发生在加利福尼亚州中西部的圣玛丽亚省.
- 这种火山活动发生在米奥森早期,大约1700万年前.
研究的目的:
- 调查圣玛丽亚省的早期米奥森双模火山运动的起源和过程.
- 了解火山岩的来源和山脊沟相互作用的作用.
主要方法:
- 对同位素成分 (新和) 的分析.
- 火山岩的微量元素分析.
- 地质绘制和解释地下岩石.
主要成果:
- 火山岩石来源于一个耗尽的地幔 (中洋脊玄武岩) 来源.
- 峰沟的相互作用将大陆边缘下面的枯竭地幔水库相对应.
- 当地的罗纪-白纪沉积岩和半沉积岩基岩的同化和部分融化形成了岩和乳岩.
结论:
- 双模火山活动是东太平洋上升和加利福尼亚潜水带之间的相互作用的直接结果.
- 该研究阐明了在这样的构造事件期间,在活跃的大陆边缘发生的复杂的岩过程.
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