Chapter 18 Characterization of mafic enclaves in the erupted products of Soufrière Hills Volcano, Montserrat, 2009 to 2010

Chapter 18 Characterization of mafic enclaves in the erupted products of Soufrière Hills Volcano, Montserrat, 2009 to 2010
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第 18 章 2009 年至 2010 年蒙特塞拉特苏弗里埃尔山火山喷发产物中镁铁质包体的特征

DOI:
10.1144/m39.18
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发表时间:
2014
期刊:
Geological Society, London, Memoirs
影响因子:
--
通讯作者:
Plail M
Plail M
中科院分区:
--
文献类型:
--
作者:
Plail M

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蒙特塞拉特苏弗里耶尔山火山(SHV)目前喷发的熔岩显示出岩浆混合的证据,与深部镁铁质岩浆侵入有关。对2009-2010年安山岩中的镁铁质包体进行了详细的野外、岩石学、结构和地球化学描述,并将其划分为3种不同类型:A类为镁铁质、玻璃质、边缘冷裂、少量继承斑晶; B类演化程度更高,继承斑晶含量高,玻璃质含量少,被解释为显著混杂; C型为复合型,具有镁铁质内部(A型)和混合外部(B型)。所有包体定义紧密的线性组成趋势,解释为镁铁质端员(A型)和主机安山岩之间的混合。包体玻璃是流纹质的,这是由于在淬火过程中大量结晶。A型淬火结晶是由注入安山岩过程中的快速热平衡驱动的。相反,B型包体形成在混合熔体层中,其在腔室的基部附近积水并且冷却得更慢。在镁铁-镁铁界面附近的囊泡化导致杂化层的破坏和B型包体的形成。复合包体代表A型和B型之间的界面,表明多次镁铁质注入。
Lavas from the current eruption of the Soufrière Hills Volcano (SHV), Montserrat exhibit evidence for magma mingling, related to the intrusion of mafic magma at depth. We present detailed field, petrological, textural and geochemical descriptions of mafic enclaves in andesite erupted during 2009–2010, and subdivide the enclaves into three distinct types: type A are mafic, glassy with chilled margins and few inherited phenocrysts; type B are more evolved with high inherited phenocryst content and little glass, and are interpreted as significantly hybridized; type C are composite, with a mafic interior (type A) and a hybrid exterior (type B). All enclaves define tight linear compositional trends, interpreted as mixing between a mafic end member (type A) and host andesite. Enclave glasses are rhyolitic, owing to extensive crystallization during quenching. Type A quench crystallization is driven by rapid thermal equilibration during injection into the andesite. Conversely, type B enclaves form in a hybridized melt layer, which ponded near the base of the chamber and cooled more slowly. Vesiculation near the mafic–silicic interface resulted in disruption of the hybridized layer and the formation of the type B enclaves. The composite enclaves represent an interface between types A and B, suggesting multiple episodes of mafic injection.
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