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榴辉岩的泊松比及其对造山带下地壳拆沉作用的指示 被引量:6

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摘要 对大别-苏鲁超高压变质带榴辉岩的实验测定以及前人的实验结果表明,水化作用将明显增加榴辉岩的泊松比,新鲜未退变榴辉岩(H20+<1.0%)的平均泊松比为0.24-0.25,该值与实验和理论计算结果相一致,而明显低于前人给出的榴辉岩平均泊松比(0.27±0.02).未退变榴辉岩的泊松比显著低于下地壳镁铁质麻粒岩,也低于上地幔橄榄岩.大别超高压带、青藏高原和安第斯山脉现今下地壳和上地幔的泊松比均大于0.26,加之它们均具有正常的上地幔VP值,表明由于拆沉怍用榴辉岩在这些俯冲一碰撞造山带下地壳和上地幔已不存在或不是重要组成.榴辉岩从形成至拆沉是在<15 Ma的十分短暂时间内完成的.
出处 《中国科学(D辑)》 CSCD 北大核心 2002年第11期881-888,共8页 Science in China(Series D)
基金 国家自然科学基金(批准号:40133020 49794043) 国家重点基础研究发展规划项目(批准号:G1999043202)联合资助
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