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 。
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.
出处
《矿床地质》
CAS
CSCD
北大核心
2004年第1期115-122,共8页
Mineral Deposits
基金
中国地质调查局地质调查项目 (编号 :2 0 0 1 1 0 2 0 0 0 38)
国家自然科学基金项目(编号 :4 0 2 72 0 88)
国家重点基础规划发展项目(编号 :G 1 9990 4 32 1 1 )成果
