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首页> 外文期刊>Contributions to Mineralogy and Petrology >A REE-in-plagioclase-clinopyroxene thermometer for crustal rocks
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A REE-in-plagioclase-clinopyroxene thermometer for crustal rocks

机译：用于地壳岩石的斜长石斜辉石稀土元素温度计

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A REE-in-plagioclase-clinopyroxene thermometer has been developed on the basis of the temperature-and composition-dependent rare-earth element (REE) partitioning between coexisting plagioclase and clinopyroxene. This two-mineral exchange thermobarometer is constructed using parameters from lattice strain models for REE + Y partitioning in plagioclase and in clinopyroxene that were independently calibrated against experimentally determined mineral-melt partitioning data. An important advantage of this REE-based thermometer is that it can provide accurate temperatures through linear least-squares analysis of REE + Y as a group. Applications of the REE-in-plagioclase- clinopyroxene thermometer to volcanic and cumulate rocks show that temperatures derived from the new thermometer agree well with independently constrained magma crystallization temperatures, which adds confidence to applications of the REE-exchange thermometer to natural rocks with a wide spectrum of composition (i.e., from basalt to rhyolite). However, systematic temperature differences appear between the REE- and Mg-exchange thermometers for the volcanic and cumulate rocks. Through numerical simulations of diffusion in plagioclase-clinopyroxene systems, we demonstrate that (1) due to their slower diffusion rates, REE in minerals preferentially records crystallization or near-crystallization temperatures of the rock, and that (2) Mg is readily rest to lower temperatures for rocks from intermediately or slowly cooled magma bodies but records the initial crystallization temperatures of rocks from rapidly cooled magmas. Given their distinct diffusive responses to temperature changes, REE and Mg closure temperatures recorded by the two thermometers can be used in concert to study thermal and magmatic histories of plagioclase-and clinopyroxene-bearing rocks.
机译：基于共存斜长石和斜辉石之间与温度和成分相关的稀土元素 （REE） 分配，开发了一种斜长石斜辉石中的稀土元素 （REE） 温度计。该双矿物交换温度晴雨表使用斜长石和斜辉石中 REE + Y 分配的晶格应变模型的参数构建，这些参数根据实验确定的矿物熔体分配数据进行独立校准。这种基于稀土元素的温度计的一个重要优点是，它可以通过对 REE + Y 作为一个组进行线性最小二乘分析来提供准确的温度。斜长石中稀土元素温度计在火山岩和积聚岩中的应用表明，新温度计得出的温度与独立约束的岩浆结晶温度非常吻合，这为稀土元素交换温度计在具有广泛成分（即从玄武岩到流纹岩）的天然岩石中的应用增加了信心。然而，火山岩和积岩的稀土和镁交换温度计之间存在系统温差。通过对斜长石-斜辉石体系中扩散的数值模拟，我们证明了（1）由于其较慢的扩散速率，矿物中的稀土元素优先记录岩石的结晶或接近结晶温度，以及（2）Mg对于来自中等或缓慢冷却的岩浆体的岩石来说，很容易静止到较低的温度，但记录了来自快速冷却的岩浆的岩石的初始结晶温度。鉴于它们对温度变化的不同扩散响应，两个温度计记录的稀土和镁闭合温度可以协同用于研究斜长石和斜辉石岩石的热和岩浆历史。

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