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基于微量元素分析的古沉积背景重建——以准噶尔盆地西北缘安集海河组为例
投稿时间:2019-10-09  修订日期:2019-11-08  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020045
摘要点击次数: 97
全文下载次数: 113
作者单位E-mail
王 彤 中国石油大学北京地球科学学院 2920142264@qq.com 
朱筱敏 中国石油大学北京地球科学学院 xmzhu@cup.edu.cn 
董艳蕾 中国石油大学北京地球科学学院  
陈贺贺 中国石油大学北京地球科学学院  
苏彬 中国石油大学北京地球科学学院  
刘宇 中国石油大学(北京)地球科学学院  
伍炜 中国石化华东油气分公司泰州采油厂  
中文摘要:作为沉积背景变化的敏感性指标,微量元素含量及其比值对物源构造背景识别、沉积环境恢复和古气候重建具有重要意义。本文通过对准噶尔盆地西北缘古近系安集海河组23件泥质岩类样品微量、稀土元素分析测试,结合岩心与薄片等沉积学标志,完成了研究区古沉积背景的恢复工作。研究表明:①稀土元素球粒陨石标准化分配模式、微量元素上地幔标准化蛛网图以及Th/Sc-Zr/Sc、La/Yb-REE、La-Th-Sc判别图解综合分析指示,安集海河组物源区风化作用较强,母岩主要为大陆岛弧成因的长英质酸性火成岩,扎伊尔山早石炭世侵入岩是可能的物源区;②元素Li、Sr、Sr/Ba和Th/U组合以及U/Th、δU、δCe、Ceanom和Ce/La组合指示,安集海河组沉积期表现为陆相半咸水的氧化型沉积环境,与陆相红层等沉积特征吻合结果较好;③纵向上安集海河组Sr/Cu变化结果表明,在该沉积期,研究区气候经历了由湿热向干热转变的过程。
中文关键词:微量元素  物源  古水深  古盐度  氧化-还原条件  古气候
 
The Geochemical Restoration of Paleosedimentary Background: A Case Study of Anjihaihe Formation in Northwestern Junggar Basin
Author NameAffiliationE-mail
WANG Tong College of Geosciences,China University of Petroleum,Beijing 2920142264@qq.com 
ZHU Xiaomin College of Geosciences,China University of Petroleum,Beijing xmzhu@cup.edu.cn 
DONG Yanlei College of Geosciences,China University of Petroleum,Beijing  
CHEN Hehe College of Geosciences,China University of Petroleum,Beijing  
SU Bin College of Geosciences,China University of Petroleum,Beijing  
LIU Yu College of Geosciences,China University of Petroleum,Beijing  
WU Wei Taizhou Oil Production Plant, Sinopec East China Company  
Abstract:The trace elements are sensitive to the change of sedimentary background during the deposition period, making it possible to analysis the provenance and tectonic background, the sedimentary environment and the paleoclimate with the content and ratio. This paper has finished the restoration of Anjihaihe Formation in northwestern Junggar Basin, on the basis of the experiment test of trace and rare earth elements from 23 fine-grained samples and the sedimentary marks of cores and sections. The study indicates that: ①The provenance has experienced a strong weathering process and the acid felsic igneous rock formed in continental island arc are the main type of parent rock, with the help of REE/Chondrite patterns, upper mantle normalized trace element spider diagrams and the discrimination diagrams of Th/Sc-Zr/Sc, La/Yb-REE, La-Th-Sc and so on. The early Carboniferous intrusive rocks in Zaire Mountain are considered as the most probable provenance. ② The study area was in the continental brackish water of oxidizing environment during the Anjihaihe Formation period, using the characteristics of element combinations such as Li, Sr, Sr/Ba, Th/U and U/Th, δU, δCe, Ceanom, Ce/La, in agreement with the continental red beds deposite. ③ The evolution of Sr/Cu from the bottom to the top of the Anjihaihe Formation illustrates a process of climate change from damp-heat to dry-heat.
keywords:trace element  provenance  paleo-depth  paleosality  redox  paleoclimate
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