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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >High-Mg Tertiary basalts in Southern Sardinia (Italy)
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High-Mg Tertiary basalts in Southern Sardinia (Italy)

机译：撒丁岛南部（意大利）的高镁第三纪玄武岩

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摘要

High-Mg basaltic pillow lavas, important for an understanding of the petrogenetic evolution of the Tertiary volcanism of Sardinia, have recently been recognized in the lower part of the Early-Burdigalian volcano-sedimentary succession of the Villanovaforru (VF) area (Southern Sardinian Trough). Their textures vary from porphyritic to highly phyric types (doleritic) and the paragenesis is represented by Pl+Ol+Cpx±Opx±Opq. These basalts are sub-alkaline with a tholeiitic tendency; they display high MgO (mg-number 64-68), high Ni and Cr contents and their geochemical features are related to subduction-related magmas, with large-ion lithophile element enrichment and negative Nb, Zr and Ce spikes in mantle-normalized diagrams. The mineralogical and geochemical characteristics indicate that the VF basalts crystallized from primitive magmas within an extension-dominated tectonic setting. The presence of primitive basalts suggests crustal thinning in association with the Burdigalian extensional tectonics affecting the Sardinian Trough.
机译：高镁玄武岩枕形熔岩对理解撒丁岛第三纪火山岩的成因演化很重要，最近在比利亚诺福鲁（VF）地区（南撒丁岛槽） ）。它们的质地从斑状到高度物理类型（白垩质）不等，并且共生用Pl + Ol + Cpx±Opx±Opq表示。这些玄武岩是碱性的，具有变质趋势。它们显示出高的MgO（mg数为64-68），高的Ni和Cr含量，并且它们的地球化学特征与俯冲相关的岩浆有关，在地幔归一化图中具有大离子的亲石元素富集和负Nb，Zr和Ce尖峰。矿物学和地球化学特征表明，VF玄武岩是在伸展为主的构造环境中从原始岩浆中结晶出来的。原始玄武岩的存在表明地壳变薄，与影响撒丁岛海槽的布尔迪加拉伸展构造有关。

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