【摘要】：化學(xué)風(fēng)化過程中稀土元素的地球化學(xué)行為研究一直是人類科學(xué)發(fā)展研究中的重要課題,曾引起國內(nèi)外學(xué)者的普遍關(guān)注,尤其自20世紀(jì)60年代起關(guān)于稀土元素行為的研究較為廣泛,其中以Nesbitt和Duddy的開創(chuàng)性工作為標(biāo)志,而國內(nèi)外一些學(xué)者對于稀土元素在風(fēng)化過程中是否是活動的一直存在頗多爭議,近30年來,稀土元素在風(fēng)化過程中確是活動的已被大量研究所證實(shí)(馬英軍等,2004)。此外,稀土元素地球化學(xué)行為的研究更是物源分析、氣候變化、沉積環(huán)境變化、大地構(gòu)造背景的良好示蹤劑,并有著極其重要的指示意義(楊守業(yè)等,2001;童勝琪等,2006)。總之,人類對于稀土元素地球化學(xué)行為的研究為未來化學(xué)風(fēng)化作用的研究奠定了基礎(chǔ),有著重要的前瞻性。本篇論文以松遼盆地南部哈瑪爾村附近青山口組二、三段出露的紅色泥巖剖面為研究對象,開展了以重建泥巖物源區(qū)特征和沉積環(huán)境為目的的相關(guān)研究,以期對未來探討松遼盆地元素地球化學(xué)行為具有一定的借鑒意義。結(jié)合綜上所述,通過巖石學(xué)和地球化學(xué)相結(jié)合的方法,運(yùn)用X-射線衍射、X-射線熒光光譜等技術(shù)手段,對泥巖樣品中的常量元素和稀土微量元素特征進(jìn)行了分析研究,數(shù)據(jù)結(jié)果表明:(1)泥巖的稀土元素(∑REE)總高,介于138.35~274.98ppm之間,LREE/HREE在8.16~12.90ppm之間,REE分布形式顯示輕稀土元素富集和重稀土元素的虧損,Eu(0.88~1.16)存在負(fù)異常特征;(2)泥巖的主要礦物成分為粘土礦物和硅酸鹽礦物,其次是碳酸鹽礦物;(3)根據(jù)判別函數(shù)(F1和F2)及其相關(guān)圖形,La/Sc-Co/Th圖解和La/Yb-∑REE圖解來確定,泥巖的母巖類型主要是沉積巖和中基性火山巖。結(jié)合CIA指數(shù)(59.94~71.34)和ICV指數(shù)(1.2~2.1),泥巖修正后的CIA值較低,表明該區(qū)經(jīng)歷了弱風(fēng)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,物源區(qū)為干旱炎熱的氣候條件。
[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，

本文編號：2249186