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首页> 外文期刊>Contributions to Mineralogy and Petrology >Successive episodes of reactive liquid flow through a layered intrusion (Unit 9, Rum Eastern Layered Intrusion, Scotland)
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Successive episodes of reactive liquid flow through a layered intrusion (Unit 9, Rum Eastern Layered Intrusion, Scotland)

机译：反应性液体连续流过分层侵入物（苏格兰朗姆酒东部分层侵入物，第9单元）

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We present a detailed microstractural and geo-chemical study of reactive liquid flow in Unit 9 of the Rum Eastern Layered Intrusion, Scotland. Unit 9 comprises an underlying lens-like body of peridotite overlain by a sequence of troctolite and gabbro (termed allivalite), with some local and minor anorthosite. The troctolite is separated from the overlying gabbro by a distinct, sub-horizontal, undulose horizon (the 'major wavy horizon'). Higher in the stratigraphy is another, similar, horizon (the 'minor wavy horizon') that separates relatively clinopyroxene-poor gabbro from an overlying gabbro. To the north of the peridotite lens, both troctolite and gabbro grade into poikilitic gabbro. Clinopy-roxene habit in the allivalite varies from thin rims around olivine in troctolite to equigranular crystals in gabbro and to oikocrysts in poikilitic gabbro. The poikilitic gabbros contain multiple generations of clinopyroxene, with Cr-rich (~1.1 wt% Cr_2O_3) anhedral cores with moderate REE concentrations (corel) overgrown by an anhedral REE-depleted second generation with moderate Cr (~ 0.7 wt% Cr_2O_3) {core!). These composite cores are rimmed by Cr-poor (~0.2 wt% Cr_2O_3) and REE-poor to -moderate clinopyroxene. We interpret these microstructures as a consequence oftwo separate episodes of partial melting triggered by the intrusion of hot olivine-phyric picrite to form the discontinuous lenses that comprise the Unit 9 peridotite. Loss of clinopy-roxene-saturated partial melt from the lower part of the allivalite immediately following the early stages of sill intrusion resulted in the formation of clinopyroxene-poor gabbro. The spatial extent of clinopyroxene loss is marked by the minor wavy horizon. A second partial melting event stripped out almost all clinopyroxene from the lowest allivalite to form a troctolite, with the major wavy horizon marking the extent of melting during this episode. The poikilitic gabbro formed from clinopyroxene-saturated melt moving upwards and laterally through the remobilized cumulate pile and precipitating clinopyroxene en route. This process, called reactive liquid flow, is potentially important in open magma chambers.
机译：我们在苏格兰朗姆酒东部分层侵入体的第9单元中介绍了反应液流的详细显微结构和地球化学研究。第9单元由橄榄石和辉闪长石（称为钠长石）覆盖，下面是橄榄石的晶状体，下面有一些局部和较小的钙长石。滑石与上覆的辉长岩之间有一个独特的，水平以下的，不弯曲的地平线（“主要波浪状地平线”）。在地层中较高的位置是另一个相似的层位（“较小的波浪层位”），它将相对较斜云层贫瘠的辉长岩和上覆的辉长岩分开。在橄榄岩晶状体的北面，滑石和辉长岩都变成了斜长石辉长岩。硅藻土的斜辉石习性从在闪锌矿中橄榄石周围的薄边缘到辉长岩中的等粒晶体和变质辉长岩中的蛇纹石。球状辉长岩包含多代次氯环己烯，富铬（〜1.1 wt％Cr_2O_3）的铁水芯核心具有中等的REE浓度（corel），而第二代含中等含量的Cr（〜0.7 wt％Cr_2O_3）的铁水分子贫化！）。这些复合芯被贫铬（〜0.2 wt％Cr_2O_3）和贫稀土至中度次氯吡喃所包围。我们将这些微结构解释为由热橄榄石-苦味苦橙的侵入触发而形成的不连续晶状体（包括9号橄榄岩）导致的两个独立的局部熔化事件的结果。窗台侵入早期之后，立即从钠铝石下部损失了饱和氯化亚铁-环氧乙烷饱和的部分熔体，从而形成了贫化亚铁和辉石的辉长岩。斜向辉石损失的空间范围以较小的波浪形地平线为标志。第二次部分熔化事件从最低的钠铝石中去除了几乎所有的斜辉石，形成了斜方晶石，主要的波浪状地平线标志着这一事件期间的熔化程度。斜长石饱和的熔体通过移动的堆积桩向上和侧向移动并在路线中沉淀出斜长石，形成了长石辉长石。这个过程称为反应性液体流动，在开放的岩浆室中可能很重要。

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