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首页> 外文学位 >Mineralogy, petrology, and isotope geochemistry of magmatic rocks from the Western Alps, Ernici and Roccamonfina, Italy: Constraints on mantle enrichment processes.
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Mineralogy, petrology, and isotope geochemistry of magmatic rocks from the Western Alps, Ernici and Roccamonfina, Italy: Constraints on mantle enrichment processes.

机译：来自意大利阿尔卑斯山，埃尔尼奇和罗卡蒙尼纳的岩浆岩的矿物学，岩石学和同位素地球化学：地幔富集过程的限制。

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摘要

Mineralogical and geochemical data from lamprophyres from the Western Alps, northern Italy, and volcanic rocks from Roccamonfina and Ernici, central-southern Italy, are used to investigate mantle enrichment processes. The lamprophyres are classified as minettes, spessartites, and kersantites, whereas the volcanic rocks from Roccamonfina and Ernici include a potassic series (KS) and an ultrapotassic series (HKS). The lamprophyres and the KS and HKS rocks have high concentrations of LREE and strongly fractionated LREE/HREE and LILE/HFSE ratios similar to many subduction-related rocks. Incompatible trace element ratios and Sr, Nd, and Pb isotopic data support metasomatism by a slab-derived fluid in the Alpine mantle, and by a carbonate-rich melt beneath the Apennines. High B contents in rocks from Roccamonfina and Ernici constrain subduction-related metasomatism to the past 5 Ma in central-southern Italy.; Isotopic data from rocks from the Western Alps, Roccamonfina, and Ernici fall on a previously-defined, two-component mixing line between a depleted, mantle end-member and an enriched, crust-like end-member. The lamprophyres from the Western Alps best represent the enriched end-member, while rocks from Roccamonfina and Ernici have moderately enriched signatures that lie between those of the Roman and Campanian Provinces. The geodynamic model favoured for the origin of the two isotopic end-members involves a widespread, isotopically-depleted asthenosphere variably contaminated by pelagic sediments subducted during closure of the Tethyan Ocean. Incompatible trace element and K2O contents of rocks from Roccamonfina and Ernici are attributed to source enrichment during Apennine subduction.
机译：来自意大利西部阿尔卑斯山的煌斑岩的矿物学和地球化学数据，以及来自意大利中南部的Roccamonfina和Ernici的火山岩的矿物学和地球化学数据，被用于研究地幔富集过程。煌斑岩被划分为细小陨石，方镁石和方解石，而罗卡蒙菲纳（Roccamonfina）和额尔尼基（Ernici）的火山岩包括钾盐系列（KS）和超钾质系列（HKS）。煌斑岩和KS和HKS岩石具有很高的LREE浓度，并且LREE / HREE和LILE / HFSE的比例很强，类似于许多俯冲作用相关的岩石。痕量元素比率和Sr，Nd和Pb同位素数据不兼容，通过高山地幔中的板状流体以及亚平宁山脉下的富含碳酸盐的熔体来支持交代作用。 Roccamonfina和Ernici岩石中的高B含量将俯冲相关的交代作用限制到意大利中南部的过去5 Ma。来自西阿尔卑斯山，罗卡蒙尼和埃尔尼奇的岩石的同位素数据落在一个预先定义的，由两部分组成的混合线之间，即贫化的地幔端构件和富集的地壳状端构件之间。来自西部阿尔卑斯山的煌斑岩最能代表富集的末段成员，而来自Roccamonfina和Ernici的岩石具有中等富集的特征，介于罗马和Campanian省之间。支持两个同位素末端成员起源的地球动力学模型涉及广泛的，同位素贫乏的软流圈，这些软流圈被特提斯洋封闭期间俯冲的浮游沉积物所污染。 Roccamonfina和Ernici的岩石中微量元素和K2O含量不兼容，归因于亚平宁俯冲过程中的源富集。

著录项

  • 作者

    Owen, Jennifer P.;

  • 作者单位

    Carleton University (Canada).;

  • 授予单位 Carleton University (Canada).;
  • 学科 Geology.; Geochemistry.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 452 p.
  • 总页数 452
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;地质学;
  • 关键词

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