Samarium-Neodymium Direct Dating of Fluorite Mineralization

Samarium-Neodymium Direct Dating of Fluorite Mineralization
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DOI：
10.1126/science.252.5008.949
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发表时间：
1991-05
期刊：
Science
影响因子：
56.9
通讯作者：
J. Chesley;Alex N. Halliday;R. Scrivener
J. Chesley;Alex N. Halliday;R. Scrivener
中科院分区：
综合性期刊1区
文献类型：
--
作者：
J. Chesley;Alex N. Halliday;R. Scrivener

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事实证明，对许多类型的热液成矿作用进行直接测年非常困难，这限制了对导致地壳流体流动和主要矿床形成的地质过程的理解。热液矿物萤石 (CaF2) 在单一矿脉内的稀土元素 (REE) 丰度和钐/钕比率表现出巨大变化。对英格兰西南部经典花岗岩锡矿床中的萤石进行的钐-钕测年证明了其作为精确矿化计时器的用途。萤石中轻稀土元素 (LREE) 的浓度变化很大，表明富含 LREE 相的同时沉淀是钐/钕比率极端变化的最可能原因。
The direct dating of many styles of hydrothermal mineralization has proved difficult, limiting understanding of the geological processes that lead to crustal fluid flow and the formation of major ore deposits. The hydrothermal mineral fluorite (CaF2) displays large variations in rare earth element (REE) abundance and samarium/neodymium ratios within a single vein. Samarium-neodymium dating of fluorite from the classic granite-hosted tin deposits of southwest England demonstrates its use as a precise chronometer of mineralization. The concentrations of light rare earth elements (LREEs) in the fluorites are highly variable and suggest the coeval precipitation of an LREE-rich phase as the most likely cause of the extreme variation in samarium/neodymium ratios.