江苏赣榆城头地区中生代侵入岩岩石谱系单位划分  

Classification of the Hierarchical Units of Mesozoic Intrusive Rocks in Chengtou Region of Ganyu County, North Jiangsu

作　　者：李向前[1] 陈炯达[1] 潘明宝[1] 

机构地区：[1]江苏省地质调查研究院

出　　处：《江苏地质》1999年第2期80-83,共4页Jiangsu Geology

摘　　要：城头地区中生代侵入体经地面调查和对比分析，初步建立了夹山、朱苍２序列共７个单元，其矿物成分、结构构造、岩石化学、地球化学特征有一定的演化规律，根据同位素年龄及区域地质资料，确定夹山序列为早白垩世侵入岩，朱苍序列为晚侏罗世或更早的侵入岩，两个序列皆属Ⅰ型花岗岩，岩浆来源初步认为是上地幔与下部地壳经同熔作用的产物，侵位机制为受北东向构造控制的被动式侵位。Two successions including Jiashan and Zhucang and seven units have been initially established, according to the field survey and contrast to the Mesozoic intrusive rocks in Chengtou region. The characters of mineral composition, structure and tectonics, lithochemistry and geochemistry of the Mesozoic intrusive rocks have specific evolutional regularities. Based on the isotopic age and regional geological data, Jiashan succession is defined as Lower Cretaceous intrusive rock and the Zhucang succession Upper Jurassic or the lower intrusive rock, both belong to I type granite. The magma source is initially considered as a product from upper mantle and lower crust through syntexis. The emplaced mechanism is a passive emplacement controlled by NE strike tectonics.

关 键 词：侵入岩 中生代 夹山序列 朱苍序列 岩石谱系 

分 类 号：P588.12[天文地球—岩石学]