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在玄武系统中,微量元素的分离是氧气流失的函数

J Leuthold^1,2, J Blundy³, P Ulmer¹

¹Department of Earth Sciences, ETH Zürich, Clausiusstrasse 25, 8092 Zurich, Switzerland.

Contributions to mineralogy and petrology. Beitrage zur Mineralogie und Petrologie

|April 15, 2024

概括

岩石中的氧气流动性 (fO2) 显著影响着基岩系统. 奥利文融V分割系数 (DV) 提供了一个精确的,独立于温度的氧气计,用于确定 magma 中的氧化还原条件.

科学领域:

地质化学地质化学
石化学石化学是一门学科.
实验性矿物学实验性矿物学

背景情况:

岩石氧气流动性 (fO2) 是一个关键参数,影响分化和融化结构,以及温度,压力和融化化学.
了解氧化还原条件对于解释矿物质稳定性和火性系统中矿物质融化分离是必不可少的.

研究的目的:

为了研究不同氧气流动性 (fO2) 对矿物稳定性和矿物融分离在玄武岩系统的影响.
评估微量元素分离的潜力,作为 magma 系统的氧气计.

主要方法:

在平衡,一个大气层的实验中,在1200-1110°C的皮克里特上进行了一系列的FO2条件 (NNO-4到空气).
对氧化还原敏感元素 (Cr,Eu,V,Fe) 的矿物融分离系数 (D) 的分析.
评估clinopyroxene部门的区分和相结合的替代.
将实验结果与已发表的数据集成在一起,以开发氧气计表达式.

主要成果:

在不同的条件下,克林诺皮洛克森,血流,橄和螺旋结晶;在减少条件下,螺旋不存在.
奥利文Mg#随着fO2的增加而增加,并且对氧化还原敏感元素的矿物溶解分区系数随着fO2和温度而系统地变化.
克林诺普洛克森呈现出部门区分,与结晶学取向和FO2.2相关的明显组成差异.
奥利文融DV,克林皮洛克森融DV/DSc,以及青酸融DEu/DSr显示出作为氧气计的潜力.
奥利文融DV被认定为一个精确而准确的氧气计,独立于温度,晶体和融成分.
在融中的物种化受到Fe-V平衡的影响,火效应导致平均价值的总体减少.

结论:

多价值物种的矿物溶解分区为含铁的岩系统中氧化还原物种的有价值探测提供了宝贵的探测器,不受火效应的影响.
奥利文融DV提供了一种可靠的方法来确定高精度和准确度的岩氧气流动性 (fO2).
这项研究提供了微量元素氧气对比的定量表达式,增强了我们对基岩岩中氧化还原过程的理解.

关键词:

玄武岩是一种岩.克林诺皮洛克森 (Clinopyroxene) 是一种类型的实验性岩石学试验性岩石学氧化还原剂的使用方法部门区域划分部门的划分.微量元素分区的划分

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