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首页> 外文期刊>Contributions to Mineralogy and Petrology >Unravelling the magmatic system beneath a monogenetic volcanic complex (Jagged Rocks Complex, Hopi Buttes, AZ, USA)
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Unravelling the magmatic system beneath a monogenetic volcanic complex (Jagged Rocks Complex, Hopi Buttes, AZ, USA)

机译：在单一的火山复合物下方解开岩石系统（锯齿状岩石复合物，Hopi Buttes，AZ，USA）

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The Jagged Rocks complex is the eroded remnant of the plumbing systems of closely spaced monogenetic alkaline volcanic centres in the southern Hopi Buttes Volcanic Field (AZ, USA). It contains different clinopyroxene populations with distinctive textures and geochemical patterns. In the Northwestern part of the complex, which exposes the best developed system of conduits, most of the clinopyroxenes consist of large-to medium-sized resorbed cores overgrown by euhedral rims (type 1), small moderately resorbed greenish cores with the same overgrown rims (type 2), and phlogopite as an accessory phase. By contrast, in the Southern part of the complex the majority of clinopyroxenes are euhedral with oscillatory zonation (type 3) and are accompanied by minor euhedral olivine. The differences between these mineral assemblages indicate a composite history of crystallization and magmatic evolution for the two parts of the complex, governed by different mechanisms and ascent patterns from a single source at similar to 50 km depth (16 kbar). The Northwest system preserves a high-pressure assemblage that cooled rapidly from near-liquidus conditions, suggesting direct ascent from the source to the surface at high-to-moderate transport rates (average similar to 1.25 m/s). By contrast, the Southern system represents magma that advanced upward at much lower overall ascent rates, stalling at times to form small-volume mid-crustal storage zones (e.g., sills or a network of sheeted intrusions); this allowed the re-equilibration of the magma at lower pressure (similar to 30 km; 8 kbar), and led to nucleation and growth of euhedral clinopyroxene and olivine phenocrysts.
机译：锯齿状的岩石综合体是南部Hopi Buttes火山（AZ，USA）中紧密间隔的单一碱性火山中心的管道系统的侵蚀残余。它含有不同的临床植物，具有独特的纹理和地球化学模式。在西北部的复杂部分暴露出最好的导管系统中，大多数临床曲折由Euhedral rims（1型）长满的大型中等大小的反射芯，具有相同的长满外缘的小型中间核心。 （类型2）和百分点作为附件阶段。相比之下，在复杂的南部，大多数临床是具有振荡区划（3型）的Euhedral，并伴有轻微的Euhedral Olivine。这些矿物组件之间的差异表示复合物的两部分的结晶和岩浆演进的复合历史，由不同机制和上升图案来自类似于50km深度（16 kbar）的单一来源。西北系统保留了一种高压组合，从近液体条件快速冷却，表明从源极直接上升到高于中等的运输速率（平均值到1.25 m / s）。相比之下，南方系统代表岩浆，以更低的总上升率向上推进，有时延续，以形成小体积的中型存储区（例如，窗台或片状入侵网络）;这允许在较低的压力下重新平衡岩浆（类似于30公里; 8 kbar），并导致Euhedral Clinopococexene和Olivine PhenCrysts的成核和生长。

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