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首页> 外文期刊>Contributions to Mineralogy and Petrology >The significance of plagioclase textures in mid-ocean ridge basalt (Gakkel Ridge, Arctic Ocean)
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The significance of plagioclase textures in mid-ocean ridge basalt (Gakkel Ridge, Arctic Ocean)

机译：Mid-Ocean Ridge Basyt（Gakkel Ridge，Arctic海洋）中斑胶酶纹理的意义

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Textures and compositions of minerals can be used to infer the physiochemical conditions present within magmatic systems. Given that plagioclase is an abundant phase in many magmatic systems, understanding the link between texture and process is vital. Here, we present a database of textural and compositional data for>1800 plagioclase crystals in mid-ocean ridge basalt from the Gakkel Ridge (Arctic Ocean) to investigate the physiochemical conditions and processes that govern the formation of plagioclase textures and compositions. The Gakkel basalts have high modal crystal contents (up to 50%). The crystal cargo is complex, with both individual plagioclase and glomerocrysts showing large variations in crystal habit, zoning and resorption. The most common types of zoning are reverse and patchy; we attribute patchy zoning to infilling following either skeletal growth or resorption. Resorption is abundant, with multiple resorption events commonly present in a single crystal, and results from both magmatic recharge and decompression. Periods of strong undercooling, distinct to quench crystallisation, are indicated by matured skeletal crystals and thin normally zoned melt inclusion-rich bands following resorption. Individual samples often contain diverse textural and compositional plagioclase groups. Furthermore, most plagioclase is not in equilibrium with its host melt. Finally, the porous open structures of some glomerocrysts suggest that they represent pieces of entrained disaggregated mush. We interpret this to indicate that the crystal cargo is not generally phenocrystic in origin. Instead, plagioclase crystals that formed in different parts of a mush-dominated plumbing system were entrained into ascending melts. The textures of individual crystals are a function of their respective histories of (under)cooling, magma mixing and decompression. The morphologies of melt inclusion trapped in the plagioclase crystals are associated with specific host crystal textures, suggesting a link between plagioclase crystallisation processes and melt inclusion entrapment. The database of plagioclase presented herein may serve as a template for the interpretation of plagioclase textures in magmatic systems elsewhere.
机译：纹理和矿物质的组合物可用于推断岩浆系统内存在的物理化学条件。鉴于Plagioclase在许多岩浆系统中是一种丰富的阶段，了解纹理和过程之间的联系至关重要。在这里，我们在来自Gakkel Ridge（北极海洋）的中海脊玄武岩中的造影和组成数据数据库> 1800型普拉基酶晶体，从Gakkel Ridge（北极海洋）中探讨了治理普发基酶纹理和组合物形成的生理化学条件和过程。 Gakkel Basalts具有高模态晶体含量（高达50％）。晶体货物很复杂，单独的Plagioclase和肾小球晶体显示出晶体习性，分区和吸收的大变化。最常见的分区类型是反向和拼凑的;在骨骼生长或吸收后，我们将斑驳的分区填充到infilling。吸收是丰富的，具有通常存在于单晶中的多个吸收事件，并产生岩浆充电和减压。强渗过冷却的时期，明显与淬火结晶，由成熟的骨骼晶体和薄的常规植物富含富含富含富含富含富含的富含带状的带有。单个样品通常含有不同的纹理和成分蛋白酶基团。此外，大多数Plagioclase不具有宿主熔体的平衡。最后，一些胶林细胞的多孔开放结构表明它们代表夹带的分类碎片。我们解释这一点以表明晶体货物通常不是原产地的苯杂交。相反，形成在糊状的管道系统的不同部分中的普发基酶晶体被夹带到上升的熔体中。个体晶体的纹理是它们各自的（下面）冷却，岩浆混合和减压的函数的函数。被困在普发基替糖酶晶体中的熔体包合物的形态与特异性宿主晶体纹理相关，表明Plagioclase结晶过程和熔体包涵体之间的联系。本文呈现的噬菌蛋白酶数据库可以用作在其他地方的岩浆系统中解释Plagioclase纹理的模板。

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