| 鲁西中生代幔枝构造及其金矿化 |
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| 引用本文：.2004.Mesozoic Mantle_branch Structure and Related Gold Deposits in Western Shandong[J].Mineral Deposits,23(1):115~122 |
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| 基金项目:中国地质调查局地质调查项目(编号：200110200038)、国家自然科学基金项目(编号：40272088)和国家重点基础规划发展项目(编号：G1999043211) |
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| 中文摘要: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。 |
| 中文关键词:地质学 中生代 幔枝构造 金矿床 鲁西 |
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| Mesozoic Mantle_branch Structure and Related Gold Deposits in Western Shandong |
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| Abstract:Viewed from mantle_plume, this paper discusses characteristics of regional geolo gy and related gold deposits in western Shandong. It is proved that Luxi (wester n Shandong) area was a typical mantle_branch structure in Mesozoic, which was co mposed of three units, i.e., igneous_metamorphic complex, surrounding detachment _slip layers and overlapped fault volcanic basin. In the overlapped fault volcan ic basin there occurred extensive magmatic rock consisting of potassium_rich int ermediate_basic to alkaline volcanic rocks and lamprophyre. Due to the uplifting of the mantle_branch structure, radial and ringed faults were formed. According to the isotopic age data, it is held that the activities of Mesozoic mantle_bra nch structure in western Shandong experienced two climax periods: one is Early J urassic ranging from 188 Ma to 190 Ma, wherase the other is Early Cretaceous ran ging from 110 Ma to 130 Ma, with the latter being more extensive. According to c haracteristics of the ore_control structure, The gold deposits related to this s tructure might be divided into two types, i.e. the ductile shear zone type and t he detachment_slip layer type, with the gold deposits of the latter type being m ore important. |
| keywords:geology, Mesozoic, mantle_branch structure, gold deposits, w estern Shandong |
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