The intermediate step in fractionation trends of mildly alkaline volcanic suites: An experimental insight from the Pavin trachyandesite (Massif Central, France)

IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Comptes Rendus Geoscience Pub Date : 2019-12-01 DOI:10.1016/j.crte.2019.07.003
Morgane Rondet, Caroline Martel, Jean-Louis Bourdier
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引用次数: 5

Abstract

We examined magma storage conditions and eruptive dynamics for the trachyandesite (~58 wt% SiO2, 9–10 wt% alkalis) of the Pavin monogenetic volcano, a maar-like explosive crater belonging to a small group of youngest volcanoes in the Massif Central. By confronting the natural samples to experimental products, we constrained pre-eruptive conditions around 950–975 °C, 150–200 MPa (~5.5–7.0 km in depth), NNO+1.5, and 4.5–5.5 wt% melt H2O. There is petrological evidence of magma crystallization in the conduit up to shallow levels (~50 MPa; 2 km in depth) before fragmentation into pumice clasts in the last kilometre of ascent. The experiments highlight the role of biotite and of crystallization pressure in defining separate compositional trends of residual liquids, i.e. alkaline (trachytes) versus sub-alkaline (dacite-rhyolite).

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弱碱性火山岩套分馏趋势的中间步骤:从Pavin粗安岩(法国中部Massif)获得的实验见解
我们研究了Pavin单成因火山的粗质山岩(~58 wt% SiO2, 9-10 wt%碱)的岩浆存储条件和喷发动力学,Pavin单成因火山是一个类似maar的爆炸性火山口,属于中央地块最年轻的火山群。通过将天然样品与实验产物进行对比,我们将喷发前的条件限制在950-975°C, 150-200 MPa (~ 5.5-7.0 km深度),NNO+1.5和4.5-5.5 wt%熔融H2O。岩石学证据表明,深至浅层(~50 MPa)处有岩浆结晶;2公里深),然后在上升的最后一公里碎裂成浮石碎屑。实验强调了黑云母和结晶压力在确定残余液体的不同组成趋势中的作用,即碱性(粗叶岩)和亚碱性(英安岩流纹岩)。
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来源期刊
Comptes Rendus Geoscience
Comptes Rendus Geoscience 地学-地球科学综合
CiteScore
2.80
自引率
14.30%
发文量
68
审稿时长
5.9 weeks
期刊介绍: Created in 1835 by physicist François Arago, then Permanent Secretary, the journal Comptes Rendus de l''Académie des sciences allows researchers to quickly make their work known to the international scientific community. It is divided into seven titles covering the range of scientific research fields: Mathematics, Mechanics, Chemistry, Biology, Geoscience, Physics and Palevol. Each series is led by an editor-in-chief assisted by an editorial committee. Submitted articles are reviewed by two scientists with recognized competence in the field concerned. They can be notes, announcing significant new results, as well as review articles, allowing for a fine-tuning, or even proceedings of symposia and other thematic issues, under the direction of invited editors, French or foreign.
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