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矿床地质  2004 

鲁西中生代幔枝构造及其金矿化

Keywords: 地质学,中生代,幔枝构造,金矿床,鲁西

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Abstract:

文章在收集岩石学、岩石化学、同位素地质学、构造地质学和地球物理学等资料的基础上，采用多学科相结合、相互验证和综合分析的方法，论述了鲁西中生代地质特征和金矿床形成的关系。研究表明：鲁西地区中生代为典型的幔枝构造，它是华北地幔亚热柱的次级构造单元。鲁西幔枝构造由核部岩浆_变质杂岩、外围盖层拆离滑脱层和上叠构造断陷_火山盆地3个单元组成。在上叠构造断陷_火山盆地单元内，广泛分布幔源岩浆岩，包括中基性到碱性的侵入岩、富钾火山岩和煌斑岩；同时，由于幔枝构造的上隆，形成了与之相配套的放射状和环状断裂体系。结合前人中生代岩浆活动的年龄数据，提出了鲁西中生代幔枝构造的活动经历了早侏罗世和早白垩世2个高潮期。按照构造控矿的特征，鲁西幔枝构造中的金矿床可分为韧性剪切带型和外围拆离滑脱层型两种。

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