胶北地块前寒武纪基底研究新进展  

Main Progresses in the Study of Precambrian Basement of Jiaobei Terrane,Eastern China

作　　者：徐扬[1,2] 冯岩[3] 李日辉[1,2] 

机构地区：[1]国土资源部海洋油气资源与环境地质重点实验室,山东青岛266071 [2]青岛海洋地质研究所,山东青岛266071 [3]中国地质大学能源学院,北京100083

出　　处：《现代地质》2011年第5期965-974,共10页Geoscience

基　　金：国土资源部海洋区域地质调查项目(GZH200800501)

摘　　要：胶北地块位于鲁东的沂沭断裂和五莲—烟台断裂之间,以出露不同变质程度的太古宙—古元古代的结晶基底为特征,其岩石组合为TTG质(英云闪长岩-奥长花岗岩-花岗闪长岩)片麻岩和少量变质表壳岩(变质火山岩-变质沉积岩),它们构成了胶北的花岗-绿岩体。对变质(超)基性岩、TTG岩系的岩石组合、地球化学特征和同位素年代学的研究表明,胶北地块造壳的主要时期为新太古代的2.8～2.7 Ga;在经历了2.5 Ga左右构造事件后,胶北地块进入稳定陆壳沉积阶段,并接受了古元古代的孔兹岩系沉积;最后于1.8 Ga左右发生变质。与苏鲁造山带不同,胶北地块前寒武纪基底具有许多亲华北板块的特征,二者的界线可能是五莲—烟台断裂。The Jiaodong terrane located between Yishu fault and Wulian-Yantai fault in eastern Shandong Pro-vince,is characterized by an Archean to Paleoproterozoic crystalline basement experienced different degrees of metamorphism traditionally.Its assemblage includes TTG（tonalitic-trondhjemitic-granodioritic） gneisses and a little supracrustal rocks（metavolcanite and metasedimentary）,which combined to granite-greenstone belts of Jiaodong terrane.The research of lithological,geochemical,geochronological data indicated that its continental crust was chiefly generated in Neoarchean（2.8-2.7 Ga）,and then it started intracratonic deposit of Paleoproterozoic khondalite after tectonic event at 2.5 Ga,finally it undergone the metamorphic event at 1.8 Ga.Different from Sulu orogen,some characteristics of Precambrian basement of Jiaobei terrane are related to North China Craton,and the boundary between them maybe locate along the Wulian-Yantai fault.

关 键 词：TTG 变质(超)基性岩 前寒武纪基底 胶北地块 

分 类 号：P548[天文地球—构造地质学] P534.1[天文地球—地质学]