Differentiationsgeschichte der Vulkanite der Marie Byrd Seamounts, Amundsen See, Südwestpazifik

西南太平洋阿蒙森海玛丽伯德海山火山岩的分异历史

• 批准号: 5456168
• 负责人: Professor Dr. Lothar Viereck
• 金额: --
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5456168?language=en
• 关键词: Differentiationsgeschichte; der; Vulkanite; Marie; Byrd

Basalts dredges at the flanks of the Hubert-MilIer-Seamount in the Marie-Byrd-Seamount volcanic field belong to the alkali basalt - trachybasalt differentiation series. Samples of higher crystallinity (dykes) and basalt-andesitic composition are proof for an igneous phase of higher si-saturation, cumulates including Ti-augites for an additional Si-undersaturated phase of magmatism. Xenocrystals of oligoclase indicate shallow magma plumbing of higher degrees of differentiation. Igneous clasts with greenshist metamorphic overprint are indiactions for flank collapses in order to expose these rocks from the volcanoes interior. Quartz sandstones with deformed quartz grains as major component and additional light mica clasts require continental crust as source rocks. The analyses will be extended to include the samples from all seamounts successfully dredged for igneous rocks. The discussion of the own analytical results, the combined interpretation including the data from the partner project as well as possibly resulting additional analyses will be main aspects.

玛丽-伯德-海山火山区休伯特-米勒-海山两侧的玄武岩属于碱性玄武岩-粗面玄武岩分异系列。高结晶度(岩墙)和玄武岩-安山岩成分的样品证明了高硅饱和度的火成岩相，包括钛辉石在内的堆积物是额外的硅不饱和岩浆阶段的证据。斜长石的单晶指示了分异程度较高的浅层岩浆管道。绿片岩变质叠加的火成岩碎屑是侧面坍塌的独立作用，目的是将这些岩石从火山内部暴露出来。以变形的石英颗粒为主要成分的石英砂岩和附加的轻云母碎屑需要陆壳作为源岩。分析范围将扩大到包括所有成功疏浚火成岩的海山的样品。讨论自己的分析结果、包括伙伴项目数据在内的综合解释以及可能产生的其他分析将是主要方面。