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现代地质 ›› 2011, Vol. 25 ›› Issue (5): 965-974.

• 构造地质学 • 上一篇    下一篇

胶北地块前寒武纪基底研究新进展

徐扬1,2,冯岩3,李日辉1,2   

  1. 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
  • 收稿日期:2011-05-11 修回日期:2011-09-10 出版日期:2011-10-26 发布日期:2011-11-03
  • 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。
  • 基金资助:

    国土资源部海洋区域地质调查项目(GZH200800501)。

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

 XU  Yang-1, 2 , FENG  Yan-3, LI  Ri-Hui-1, 2   

  1. 1Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources, Qingdao,
    Shandong266071,China; 2Qingdao Institute of Marine Geology, Qingdao, Shandong266071,China;
    3School of Energy Resources,China University of Geosciences,Beijing100083,China
  • Received:2011-05-11 Revised:2011-09-10 Online:2011-10-26 Published:2011-11-03

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。

关键词: TTG, 变质(超)基性岩, 前寒武纪基底, 胶北地块

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 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.

Key words: TTG, ultra basicbasic metamorphic rock, Precambrian basement, Jiaobei terrane