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首页> 外文期刊>Contributions to Mineralogy and Petrology >Variation in parental magmas of Mt Rouse, a complex polymagmatic monogenetic volcano in the basaltic intraplate Newer Volcanics Province, southeast Australia
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Variation in parental magmas of Mt Rouse, a complex polymagmatic monogenetic volcano in the basaltic intraplate Newer Volcanics Province, southeast Australia

机译：澳大利亚东南部玄武质板块内新火山省的复杂多岩性单基因火山Mt Rouse的父母岩浆变化

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摘要

Monogenetic volcanoes have long been regarded as simple in nature, involving single magma batches and uncomplicated evolutions; however, recent detailed research into individual centres is challenging that assumption. Mt Rouse (Kolor) is the volumetrically largest volcano in the monogenetic Newer Volcanics Province of southeast Australia. This study presents new major, trace and Sr-Nd-Pb isotope data for samples selected on the basis of a detailed stratigraphic framework analysis of the volcanic products from Mt Rouse. The volcano is the product of three magma batches geochemically similar to Ocean-Island basalts, featuring increasing LREE enrichment with each magma batch (batches A, B and C) but no evidence of crustal contamination; the Sr-Nd-Pb isotopes define two groupings. Modelling suggests that the magmas were sourced from a zone of partial melting crossing the lithosphere-asthenosphere boundary, with batch A forming a large-volume partial melt in the deep lithosphere (1.7 GPa/55.5 km); and batches B and C from similar areas within the shallow asthenosphere (1.88 GPa/61 km and 1.94 GPa/63 km, respectively). The formation and extraction of these magmas may have been due to high deformation rates in the mantle caused by edge-driven convection and asthenospheric upwelling. The lithosphere-asthenosphere boundary is important with respect to NVP volcanism. An eruption chronology involves sequential eruption of magma batches A, C and B, followed by simultaneous eruption of batches A and B. Mt Rouse is a complex polymagmatic monogenetic volcano that illustrates the complexity of monogenetic volcanism and demonstrates the importance of combining detailed stratigraphic analysis alongside systematic geochemical sampling.
机译：长期以来，单基因火山本质上被认为是简单的，涉及单个岩浆批次和简单的演化。但是，最近对单个中心的详细研究正在挑战这一假设。 Rouse山（科洛尔）是澳大利亚东南部单一火山岩Newer Volcanics Province中体积最大的火山。这项研究提供了新的主要，痕量和Sr-Nd-Pb同位素数据，这些数据是基于对Rouse火山产品的详细地层框架分析而选定的。火山是三个岩浆批次的产品，在地球化学上类似于海洋-岛玄武岩，其特征是每个岩浆批次（批次A，B和C）的LREE富集度增加，但没有地壳污染的迹象。 Sr-Nd-Pb同位素定义了两个组。模拟表明，岩浆来自穿过岩石圈-软流圈边界的部分熔融带，其中A批在深层岩石圈中形成了大体积的部分熔融（1.7 GPa / 55.5 km）;以及来自浅流软流圈内类似区域的批次B和C（分别为1.88 GPa / 61 km和1.94 GPa / 63 km）。这些岩浆的形成和抽出可能是由于边缘驱动的对流和软流圈上升引起的地幔高变形率。岩石圈-软流圈边界对于NVP火山活动很重要。喷发年代包括岩浆A，C和B的顺序喷发，然后是A和B批的同时喷发。Mt Rouse是一个复杂的多岩浆单基因火山，它说明了单基因火山的复杂性，并说明了将详细的地层分析与同时进行的重要性系统化的地球化学采样。

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