在中美洲边缘沿线进行气的沉降和回收
Tobias P Fischer1, David R Hilton, Mindy M Zimmer
1Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131, USA. fischer@unm.edu
概括
来自中美洲的火山气体显示出明显的 (N) 和 (He) 签名. 危地马拉的火山显示了沉积沉积物中的沉重N,而哥斯达黎加的火山则显示了较轻的N,表明了不同的地幔来源.
科学领域:
- 地质化学 地质化学
- 同位素地球化学 同位素地球化学
- 火山学 火山学是一门学科.
背景情况:
- 火山排放提供了对地球深层过程的见解.
- 火山气体中的 (N) 和 (He) 同位素可以追踪地幔来源和地回收.
- 中美洲的火山弧提供了一个独特的环境来研究潜流带动力学.
研究的目的:
- 来自中美洲火山弧的两个部分的挥发物质的 (N) 和 (He) 同位素和相对丰度特征的特征.
- 为了确定 (N) 在弧形火山活动中的来源.
- 评估潜水带在表面和地幔之间循环 (N) 中的作用.
主要方法:
- 在火山气体样本中分析N和He同位素和N2/He比率.
- 瓜地马拉和哥斯达黎加火山弧之间的同位素和丰度数据的比较.
- 质量平衡计算模型 (N) 循环.
主要成果:
- 危地马拉的火山气体表现出正的delta15N值和高的N2/He比率 (高达25,000).
- 哥斯达黎加的火山气体显示负的delta15N值和低的N2/He比率 (最大1483).
- 潜入危地马拉地幔的浅半层沉积物被确定为重型N的来源.
结论:
- 沉积沉积物是大气 (N) 的重要来源,通过弧形火山活动.
- 俯冲区作为屏障,限制沉积 (N) 转移到更深层地幔.
- 不同的同位素标志反映了危地马拉和哥斯达黎加弧线的不同沉积过程和沉积物贡献.
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