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遵化新太古代豆荚状铬铁矿变形特征、变形机制及其大洋地幔扩张运移的指示意义

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Keywords: 豆荚状铬铁矿,高温变形,大洋上地幔,板块构造,早期演化

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Abstract:

豆荚状铬铁矿是蛇绿岩套地幔构造岩中特征的矿产,其矿石发育丰富的岩浆活动-高温变形结构构造类型,豆荚状铬铁矿高温下仍具有稳定的物理化学特性,对认识大洋上地幔扩张、横向运移具有重要指示意义。在对遵化新太古代豆荚状铬铁矿显微构造的深入研究基础上,通过对比分析豆荚状铬铁矿结构构造特征(岩浆活动、低温变形),提出高温变形结构及其特征(拉长网孔结构、条带状、糜棱状结构等)。借鉴现代洋中脊及弧后盆地扩张的构造模型,提出华北新太古代豆荚状铬铁矿扩张中心形成后的显微构造演化序列,豆荚状铬铁矿变形机制的研究,可以提供认识早期大洋上地幔动力学过程的新线索。

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