松辽盆地南部哈玛尔村附近青山口组二、三段红色泥岩物源区及沉积环境
发布时间：2018-09-18 21:51
【摘要】：化学风化过程中稀土元素的地球化学行为研究一直是人类科学发展研究中的重要课题,曾引起国内外学者的普遍关注,尤其自20世纪60年代起关于稀土元素行为的研究较为广泛,其中以Nesbitt和Duddy的开创性工作为标志,而国内外一些学者对于稀土元素在风化过程中是否是活动的一直存在颇多争议,近30年来,稀土元素在风化过程中确是活动的已被大量研究所证实(马英军等,2004)。此外,稀土元素地球化学行为的研究更是物源分析、气候变化、沉积环境变化、大地构造背景的良好示踪剂,并有着极其重要的指示意义(杨守业等,2001;童胜琪等,2006)。总之,人类对于稀土元素地球化学行为的研究为未来化学风化作用的研究奠定了基础,有着重要的前瞻性。本篇论文以松辽盆地南部哈玛尔村附近青山口组二、三段出露的红色泥岩剖面为研究对象,开展了以重建泥岩物源区特征和沉积环境为目的的相关研究,以期对未来探讨松辽盆地元素地球化学行为具有一定的借鉴意义。结合综上所述,通过岩石学和地球化学相结合的方法,运用X-射线衍射、X-射线荧光光谱等技术手段,对泥岩样品中的常量元素和稀土微量元素特征进行了分析研究,数据结果表明:(1)泥岩的稀土元素(∑REE)总高,介于138.35~274.98ppm之间,LREE/HREE在8.16~12.90ppm之间,REE分布形式显示轻稀土元素富集和重稀土元素的亏损,Eu(0.88~1.16)存在负异常特征;(2)泥岩的主要矿物成分为粘土矿物和硅酸盐矿物,其次是碳酸盐矿物;(3)根据判别函数(F1和F2)及其相关图形,La/Sc-Co/Th图解和La/Yb-∑REE图解来确定,泥岩的母岩类型主要是沉积岩和中基性火山岩。结合CIA指数(59.94~71.34)和ICV指数(1.2~2.1),泥岩修正后的CIA值较低,表明该区经历了弱风化作用,Sr/Ba值(1.93~41.01)、Ti值(0.18~0.64,平均0.51),P值(0.07~0.23,平均0.13)表明,物源区为干旱炎热的气候条件。
[Abstract]:The study of the geochemical behavior of rare earth elements in the chemical weathering process has been an important subject in the development of human science, which has attracted the attention of scholars both at home and abroad. Especially since 1960s, the research on the behavior of rare earth elements (REE) has been widely studied, which is marked by the pioneering work of Nesbitt and Duddy. However, some scholars at home and abroad have been disputing whether the REE is an activity in the process of weathering. In the past 30 years, the activities of rare earth elements in weathering have been confirmed by a large number of studies (Ma Ying Jun et al. 2004). In addition, the study of geochemical behavior of rare earth elements is a good tracer of provenance analysis, climate change, sedimentary environment change and tectonic background, and has an extremely important indicative significance (Yang Shouye et al. 2001; Tong Shengqi et al. 2006). In a word, the study of geochemical behavior of rare earth elements has laid a foundation for the study of chemical weathering in the future and has important foresight. In this paper, the red mudstone profile of Qingshankou formation near Hamar Village in the south of Songliao Basin is taken as the research object. The purpose of this study is to reconstruct the characteristics of mudstone source area and sedimentary environment. It is expected that the study of element geochemical behavior in Songliao Basin can be used for reference in the future. In this paper, by combining petrology and geochemistry, the characteristics of major elements and rare earth elements in mudstone samples are analyzed by means of X ray diffraction and X ray fluorescence spectroscopy. The results show that: (1) the REE (鈭，
本文编号：2249186
[Abstract]:The study of the geochemical behavior of rare earth elements in the chemical weathering process has been an important subject in the development of human science, which has attracted the attention of scholars both at home and abroad. Especially since 1960s, the research on the behavior of rare earth elements (REE) has been widely studied, which is marked by the pioneering work of Nesbitt and Duddy. However, some scholars at home and abroad have been disputing whether the REE is an activity in the process of weathering. In the past 30 years, the activities of rare earth elements in weathering have been confirmed by a large number of studies (Ma Ying Jun et al. 2004). In addition, the study of geochemical behavior of rare earth elements is a good tracer of provenance analysis, climate change, sedimentary environment change and tectonic background, and has an extremely important indicative significance (Yang Shouye et al. 2001; Tong Shengqi et al. 2006). In a word, the study of geochemical behavior of rare earth elements has laid a foundation for the study of chemical weathering in the future and has important foresight. In this paper, the red mudstone profile of Qingshankou formation near Hamar Village in the south of Songliao Basin is taken as the research object. The purpose of this study is to reconstruct the characteristics of mudstone source area and sedimentary environment. It is expected that the study of element geochemical behavior in Songliao Basin can be used for reference in the future. In this paper, by combining petrology and geochemistry, the characteristics of major elements and rare earth elements in mudstone samples are analyzed by means of X ray diffraction and X ray fluorescence spectroscopy. The results show that: (1) the REE (鈭，
本文编号：2249186
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