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苏-鲁超高压变质带中具柯石英包体的岚山头含蓝晶石榴辉岩及其PTt轨迹 被引量:1

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摘要 在苏-鲁超高压变质带(UHPMB)的岚山头含蓝晶石榴辉岩发现柯石英包体,这使蓝晶石的稳定域延伸到2.4GPa之上。作为中国东部一条重要的超高压变质带,主要是在印支期,当初始欧亚板块与古太平洋板块作用过程中黄海地体向胶东-苏东北地体强烈挤压引发的A-型俯仲的产物。该带是由3-4个向东突出的弧形构造所组成,如威海(NW走向)-荣城(SN走向)青岛-五莲(NE走向)弧等;而岚山头榴辉岩正处于日照-赣榆弧的顶部。苏-鲁榴辉岩带延长约350km,分布大小不同的榴辉岩体超过千个。其中极大多数属Coleman等的分类中B类和C类,较普遍含有蓝晶石,但岚山头含蓝晶石榴辉岩却属于A类,并在石榴石及蓝晶石中都含有柯石英包体。更有意义的是:发现石榴石和辉石中MgO、CaO和FeO的含量从核心到边缘呈现有规律的变化,此揭示了早中生代(240-200Ma)在座俯仲过程中进变质及在晚中生代和新生代折返地表过程中的PTt轨迹。
出处 《地质学报》 EI CAS CSCD 北大核心 2001年第4期570-570,共1页 Acta Geologica Sinica
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