• 责任者：Meng Fanchao (School of Geosciences ; China University of Petroleum ; Qingdao 266580 ; China) ; Qiu Longwei
• 刊名：Chinese Journal of Geology
• 出版年：2013
• 卷期：48(3)
• 关键词：基底 ; basement ; 原岩 ; protolith ; 济阳坳陷 ; Jiyang Depression
• 页码：p.707-720
• 图表：6 illus., 2 tables, 34 refs.
• 分类号：0801
• issnNo：ISSN0563-5020
• isbnNo：CN11-1937/P

     The basement rocks are wildly distributed in Chengdong salient, Jiyang depression,with  many varieties of rock types. Observation of cores and thin sections indicate that the basement  rocks are mainly composed of gneisses such as granitic gneiss, monzogranite gneiss, biotite  plagiogneiss, and older magmatic rocks like quartz diorite, granodiorite, with a little quartzite,  leptynite, and younger vein rocks such as lamprophyres, feldspar granites. Analyses of  geochemistry and regional correlation study exhibit that the protoliths of gneisses are  intermediate-acid intrusive rocks belonging to TTG. The quartzite and leptynite are  metamorphosed supracrustal rocks,whose protoliths are sediments. Structural style of basement  rocks is that TTG gneisses are as tectonic domes, but supracrustal rocks fragmentary distributing around. According to rock association, protolith restoration and structural style of basement rocks,it can be concluded that the basement of Bohai Bay Basin is an important part of North China Craton＇s. Besides this, it has the immensely guiding role to research on reservoir characteristics and distribution law of basement, and- provides evidence for further study of inner buried hill of metamorphic rocks.