概括
直接测定水热矿物化的年代是具有挑战性的. 这项研究表明,化物的-测定精确地确定了花岩托管的锡沉积物的矿化日期,揭示了对地流体流动的洞察力.
科学领域:
- 地质化学 地质化学
- 经济地质学 地质学
- 同位素地质年代学 同位素地质年代学
背景情况:
- 水热矿物化的直接约会是困难的,阻碍了对矿石矿床形成的理解.
- 化物 (CaF(2) 是一种常见的热水矿物质,在单个静脉内,稀土元素 (REE) 丰度和Sm/Nd比率的显著变化.
- 了解地液流和矿石起源需要精确的约会方法来确定热水事件的时间.
研究的目的:
- 为了证明化物的-- (Sm-Nd) 测年法作为水热矿物化的精确计时器的实用性.
- 调查花岩托管锡沉积物的化物中Sm/Nd比率极端变化的原因.
- 改进与地液流和矿石形成有关的地质过程的理解.
主要方法:
- 对化物样本的萨马-新 (Sm-Nd) 同位素分析.
- 在化物中稀土元素 (REE) 度的地质化学分析.
- 在英格兰西南部的古典花岩托管锡沉积物中对化物应用约会技术.
主要成果:
- 来自英格兰西南部的花岩矿沉积物中化物的萨马里-元素约会提供了精确的矿化年龄.
- 化物样本在轻稀土元素 (LREE) 度中表现出很大的差异.
- 化物中Sm/Nd比率的极端变化归因于LREE丰富阶段的同期降水.
结论:
- 化石是一种可靠的地质计时计,用于测定水热矿化事件的年代.
- 同时存在的LREE丰富阶段解释了化物中Sm/Nd比率的变化.
- 这种约会方法增强了对推动矿石矿床形成的地质过程的理解.
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