论文部分内容阅读
崂山湾位于鲁东隆起东南胶莱坳陷的沿海一带,具特殊大地构造背景。通过该区广泛出露的煌斑岩系统的岩石学和地球化学研究,探讨其物质来源和形成过程,对于研究该区地质演化历史具有重要意义。对岩石样品进行偏光显微分析、全岩化学分析、等离子体光谱分析和等离子质谱分析,结果表明:样品具有富LILE,贫HFSE的微量元素组成和右倾型的稀土元素分布型式,略具Ce负异常。岩石地球化学特征表明,煌斑岩源于受俯冲组分改造的上地幔,源区可能因为受扬子板块向华北板块俯冲作用的影响而混染了部分壳源物质。
Laoshan Bay is located in the coastal area of the Jiao-Lai depression in the southeast of Ludong uplift, with special tectonic setting. Studying the petrology and geochemistry of the lamprophyre system widely exposed in the area and discussing the source and formation process of the lamprophyre are important for studying the geological evolution history of the area. The rock samples were analyzed by polarized light microscopy, whole rock chemical analysis, plasma spectroscopy and plasma mass spectrometry. The results show that the samples have LILE-rich and HFSE-depleted trace elements and a right-leaning REE pattern with a slight negative Ce abnormal. Petrological and geochemical characteristics of the lamprophyre suggest that the lamprophyre originates from the upper mantle transformed by subduction components. The source region may be contaminated with some of the crustaceous matter due to the subduction of the Yangtze plate to the North China plate.