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| 吐格尔明背斜核部片岩的年代学与构造意义 | |
| 引用本文： | 何登发 樊,春 雷刚林 袁,航 李,涤 常秋生.吐格尔明背斜核部片岩的年代学与构造意义[J].中国地质,2011,38(4):809-819. |
| 作者姓名： | 何登发 樊 春 雷刚林 袁 航 李 涤 常秋生 |
| 作者单位： | 1. 海相储层演化与油气富集机理教育部重点实验室,中国地质大学(北京),100083 2. 中国石油塔里木油田公司勘探开发研究院,新疆库尔勒,841000 3. 中国石油新疆油田公司勘探开发研究院,新疆克拉玛依,834000 |
| 基金项目： | 国家自然科学基金重点项目(40739906); 国家重点基础研究发展计划项目(2006CB202300)联合资助 |
| 摘 要： | 盆地基底是制约盆地形成演化与构造变形的关键因素之一,研究盆地基底是剖析盆地构造特征的重要途径。塔里木盆地北部处于负磁异常区,推测其基底为变质沉积岩。本文对这一推断利用塔里木盆地北部库车坳陷吐格尔明背斜核部出露的元古宙片岩进行了锆石U-Pb年代学和岩石地球化学研究。研究表明,片岩中锆石的206Pb/238U年龄集中在(775.3±5.8)Ma～(787.1±6.8)Ma,表明它们形成于新元古代早期,代表约800 Ma发生的晋宁运动,这一构造事件形成了塔里木盆地北部的基底。片岩SiO2含量大于70%,长英质组分含量高,Al2O3、K2O富集;稀土元素总量(ΣREE)平均为166×10-6,稀土元素配分曲线呈微右倾型,具有弱的负Eu异常;高场强元素Ta、Nb、Ti等具有负异常,大离子亲石元素Rb、Ba等具有正异常。通过原岩恢复,判断该变质岩是一套由石英砂岩类变质形成的副变质岩。这与塔北航磁负异常特征吻合,这种性质的基底强度较小,在后期表现出构造沉降幅度大与构造变形强烈。 |
| 关 键 词： | 吐格尔明背斜 片岩 U-Pb定年 副变质岩 基底 塔里木盆地 |
Chronology of Proterozoic schist at the core of Tugermin anticline in northern Tarim basin and its tectonic significance |
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| HE Deng-F,FAN Chun,LEI Gang-lin,YUAN Hang,LI Di,CHANG Qiu-Sheng.Chronology of Proterozoic schist at the core of Tugermin anticline in northern Tarim basin and its tectonic significance[J].Chinese Geology,2011,38(4):809-819. | |
| Authors: | HE Deng-F FAN Chun LEI Gang-lin YUAN Hang LI Di CHANG Qiu-Sheng |
| Institution: | HE Deng-Fa1,FAN Chun1,LEI Gang-lin2,YUAN Hang1,LI Di1,CHANG Qiu-Sheng3(1.Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism,Ministry of Education,China University of Geosciences,Beijing 100083,China,2.Institute of Exploration and Development of Tarim Oil Field Company,PetroChina,Korle 841000,Xinjiang,3.Institute of Exploration and Development of Xinjiang Oil Field Company,Karamay 834000,China) |
| Abstract: | Basin basement is one of the key factors to control basin evolution and its structural deformation.The study of basement is an important way to analyze the basin's tectonics and structures.The northern part of Tarim basin is in the negative magnetic anomaly,suggesting that the basement is composed of meta-sedimentary rocks.Utilizing the data of zircon U-Pb chronology and geochemistry of Proterozoic schist at the core of Tugerming anticline in Kuqa depression in the north of Tarim Basin,this paper conducted ... |
| Keywords: | Tugerming anticline schist U-Pb dating parametamorphic rock basement Tarim Basin |
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