| 塔里木盆地西北缘苏盖特布拉克组沉积环境及构造背景研究 |
| |
| 引用本文： | 吴福志,刘东娜,赵峰华,邹雨,谢安坤,李江山.塔里木盆地西北缘苏盖特布拉克组沉积环境及构造背景研究[J].矿物岩石地球化学通报,2021,40(2):478-490. |
| |
| 作者姓名： | 吴福志 刘东娜 赵峰华 邹雨 谢安坤 李江山 |
| |
| 作者单位： | 中国矿业大学(北京),北京100083;中国矿业大学(北京),北京100083;太原理工大学,太原030024;中国石化石油勘探开发研究院无锡石油地质研究所,江苏无锡214126 |
| |
| 摘 要： | 本文以塔里木盆地西北缘苏盖特布拉克组泥质岩为对象,对其进行了主微量元素和稀土元素地球化学分析测试,并据此探讨苏盖特布拉克组的古沉积环境、物源属性及古构造背景。结果表明,泥岩中的Al、Fe、K、Ti、Li、Sc、Th、U、Ga、Cu元素明显富集;轻稀土元素富集且分馏程度强烈,重稀土相对亏损,且具明显的Eu负异常;泥岩的化学蚀变指数为60~80,多数样品的成分变异指数大于1.0。研究表明,研究区泥质岩形成于温暖湿润的浅海氧化环境,水体盐度较低;泥质岩为初次旋回沉积物,经历了中-低程度的化学风化作用,其母岩主要为上地壳长英质岩石,并混入了少量的基性岩、碱性岩与古老沉积物;源区构造背景以大陆岛弧环境为主,兼有活动大陆边缘特征。
|
| 关 键 词： | 地球化学 沉积环境 物源 构造背景 塔里木盆地 |
Sedimentary Conditions and Geotectonic Setting Implicated from the Geochemistry of Major and Trace Elements in Pelite of the Sugetbrak Formation in Northwestern of Tarim Basin,Xinjiang,China |
| |
| WU Fu-zhi,LIU Dong-na,ZHAO Feng-hua,ZOU Yu,XIE An-kun,LI Jiang-shan.Sedimentary Conditions and Geotectonic Setting Implicated from the Geochemistry of Major and Trace Elements in Pelite of the Sugetbrak Formation in Northwestern of Tarim Basin,Xinjiang,China[J].Bulletin of Mineralogy Petrology and Geochemistry,2021,40(2):478-490. |
| |
| Authors: | WU Fu-zhi LIU Dong-na ZHAO Feng-hua ZOU Yu XIE An-kun LI Jiang-shan |
| |
| Institution: | (China University of Mining&Technology(Beijing),Beijing 100083,China;Taiyuan Unirersity of Technology,Taiyuan 030024,China;Wuxi Research Institute of Petroleum Geology,SINOPEC,Petroleum Explortion and Production Research Institate,Wuxi Jiangsu 214126,China) |
| |
| Abstract: | The paleo-sedimentary environment, provenance parent rocks and paleotectonic backgrounds of the Sugetbrak formation in the northwest margin of the Tarim basin were discussed by analyzing geochemical characteristics of main/trace elements and rare earth elements in pelite from the Sugetbrak formation in this study. The results showed that Al, Fe, K, Ti, Li, Sc, Th, U, Ga and Cu were obviously enriched in the pelite samples. The accumulation and fractionation degrees of light rare earth elements were serious, and the relative deficit of heavy rare earth elements was obvious as well as the Eu negative anomaly. The chemical alteration index values fell in the range of 60 to 80, and the composition variation indexes of most samples were greater than 1.0. The research showed that the Sugetbrak formation mudstones were formed in an oxidizing environment of warm and humid shallow sea with low salinity. The mudstones were the primary cyclic sediments, which had undergone moderate to low degrees of chemical weathering. The parent rocks were mainly feldspathic rocks in the upper crust, mixed with a small amount of basite, alkaline rock and ancient sediment. The tectonic setting of the source region was dominated by the island arc environment with certain continental margin activities. |
| |
| Keywords: | geochemistry sedimentary environment provenance tectonic background Tarim basin |
| 本文献已被 维普 万方数据 等数据库收录！ |
|
