第25卷第5期 2011年10月
现代地质 GFOSCIENCF
胶北地块前寒武纪基底研究新进展
徐扬2，冯岩”，李日辉12
（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.青岛海洋地质研充所，山东青岛266071；3.中国地质大学能源学院，北京100083）
Vol 25 No.5
Oet.2011
摘要：胶北地块位于鲁东的沂述断裂和五蓬一烟台断裂之间，以出露不同变质程度的太古宙一古元古代的结晶基底为特征，其岩石组合为TTC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2.8~2.7Ga；在经历了2.5Ga左右构造事件后，胶北地块进人稳定陆壳沉积阶段，并接受了古元古代的孔慈岩系沉积；最后于1.8Ga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一烟台断裂。关键调：TTG；变质（超）基性岩；前寒武纪基底：胶北地块
中图分类号：P548；P534.1
文献标志码：A
文章编号：10008527(2011)05-0965-10
MainProgressesintheStudyofPrecambrianBasementof
JiaobeiTerrane，EasternChina XU Yang"-, FENG Yan ", LI Ri-hui'.2
(1. Key Laboratory of Marine Hydrocarbon Resources and Entironmeslal Geology, Ministry of Land and Resources, Qingdao
Shandong 266071, China; 2. Qingdao Institule of Marine Geology, Qingdao, Shandong266071, China;
3. School of Energy Resources, China Unisersity of Ceoucienoes, Bejing 100083, China)
Abstract: 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 Paleo-proterozoic 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.
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1概述
胶莱盆地的中新生代碎屑沉积，西以沂沐断裂（郏庐断裂的北延）和华北的鲁西地块分隔，东部以五
胶北地块，也被称为胶北隆起，位于山东半莲一烟台断裂与苏鲁造山带相邻（图1）。由于大岛的北部，其北部濒临渤海湾和北黄海，南临近面积出露太古宙的古老岩石，使得胶北地块成为
收稿日期：2011-05-11；改回日期：2011~09-10；责任编辑：潘令枝。基金项目：国土资源部海洋区域地质调查项目（CZH200800501）。
作者简介：徐扬，男，研究实习员，1985年出生，构造地质学专业，主要从事构造地质学研究。
Email; xuyang_ 0112@ 163. com。