概括
西伯利亚洪水玄武岩起源于一个深层地幔羽毛,由古奥利文尼菲利尼特约会和高同位素比率证明. 后来的火山活动显示了羽毛与上层地幔的相互作用.
科学领域:
- 地质化学 地质化学
- 同位素地质年代学 同位素地质年代学
- 火山学 火山学是一门学科.
背景情况:
- 西伯利亚洪水玄武岩省 (SFBP) 是一个具有复杂起源的重大火山事件.
- 了解地幔来源和SFBP火山活动的时间对于破译大型火山性省份形成至关重要.
研究的目的:
- 确定SFBP中早期性火山岩的精确年龄和地幔来源.
- 调查SFBP中早期的性和晚期的托莱伊特性岩石之间的关系.
- 描述地幔羽毛的性质及其与石质层的相互作用.
主要方法:
- 阿贡-40/阿贡-39 (40Ar/39Ar) 橄尼菲林石的地质年代学.
- 对-3/-4 (3He/4He) 同位素分析.
- 对相关火山岩石的,石同位素和稀土元素 (REE) 分析.
主要成果:
- 一个橄尼菲利尼特产生的40Ar/39Ar高原年龄为253.3 +/- 2.6百万年,比SFBP主要的托莱伊特脉冲 (250.0百万年) 之前.
- 橄烯晶体中的高3He/4He比率 (高达大气12.7倍) 表明了下层地幔羽毛源.
- 同位素和REE数据表明,它来自一个原始的,接近体的羽毛,以后的火山活动显示与亚洋上层地幔的相互作用.
结论:
- SFBP火山活动的早期阶段是由一个明显的,长期存在的下层地幔羽毛驱动的.
- 羽毛来源在组成上是原始的,与后来的托莱伊特岩石岩石不同.
- 地化学证据表明,在SFBP进化过程中,地幔羽毛和西伯利亚次大陆石化层之间存在复杂的相互作用.
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