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首页> 外文期刊>Contributions to Mineralogy and Petrology >Geochemistry of spinel-hosted amphibole inclusions in abyssal peridotite: insight into secondary melt formation in melt-peridotite reaction
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Geochemistry of spinel-hosted amphibole inclusions in abyssal peridotite: insight into secondary melt formation in melt-peridotite reaction

机译：深渊橄榄岩中尖晶石所含的闪石包裹体的地球化学：对熔体-橄榄岩反应中二次熔体形成的认识

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摘要

Spinel-hosted hydrous silicate mineral inclusions are often observed in dunite and troctolite as well as chromitite. Their origin has been expected as products associated with melt-peridotite reaction, based on the host rock origin. However, the systematics in mineralogical and geochemical features are not yet investigated totally. In this study, we report geochemical variations of the spinel-hosted pargasite inclusions in reacted harzburgite and olivine-rich troctolite collected from Atlantis Massif, an oceanic core complex, in the Mid-Atlantic Ridge. The studied samples are a good example to examine geochemical variations in the inclusions because the origin and geological background of the host rocks have been well constrained, such as the reaction between MORB melt and depleted residual harzburgite beneath the mid-ocean ridge spreading center. The trace-element compositions of the pargasite inclusions are characterized by not only high abundance of incompatible elements but also the LREE and HFSE enrichments. Distinctive trace-element partitioning between the pargasite inclusion and the host-rock clinopyroxene supports that the secondary melt instantaneously formed by the reaction is trapped in spinel and produces inclusion minerals. While the pargasite geochemical features can be interpreted by modal change reaction of residual harzburgite, such as combination of orthopyroxene decomposition and olivine precipitation, degree of the LREE enrichment as well as variation of HREE abundance is controlled by melt/rock ratio in the reaction. The spinel-hosted hydrous inclusion could be embedded evidence indicating melt-peridotite reaction even if reaction signatures in the host rock were hidden by other consequent reactions.
机译：尖晶石，水合硅酸盐矿物包裹体经常出现在榴辉石，滑石以及铬铁矿中。根据基质岩石的起源，人们预计它们的起源是与熔融橄榄岩反应相关的产物。但是，关于矿物学和地球化学特征的系统学还没有完全研究。在这项研究中，我们报告了从大西洋中部海岭的大西洋核心地带Atlantis Massif收集的反应后的尖晶石和富含橄榄石的滑石中的尖晶石包裹的辉石包裹体的地球化学变化。研究的样品是检查夹杂物地球化学变化的一个很好的例子，因为宿主岩的起源和地质背景受到了很好的约束，例如MORB熔体与中洋脊扩散中心下方贫化的残留哈兹石之间的反应。辉石包裹体中的痕量元素组成不仅具有高含量的不相容元素，而且具有LREE和HFSE富集的特征。在辉石质夹杂物和主体岩石斜辉​​石之间的独特痕量元素划分表明，反应瞬间形成的二次熔体被捕获在尖晶石中并产生夹杂物矿物。尽管可以通过残留的尖晶石的模态变化反应（例如邻苯二茂分解和橄榄石沉淀的组合）来解释这种顺式岩石地球化学特征，但反应中的熔体/岩石比控制着LREE富集程度以及HREE丰度的变化。尖晶石包埋的含水夹杂物可以嵌入表明熔体-橄榄岩反应的证据，即使主体岩石中的反应特征被其他随后的反应所掩盖。

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