發(fā)布時間：2018-07-29 06:49

【摘要】：為了查明渝東北城口—巫溪地區(qū)上奧陶統(tǒng)五峰組—下志留統(tǒng)龍馬溪組頁巖中稀土元素的特征、來源及其地質(zhì)意義,應(yīng)用電感耦合等離子體質(zhì)譜法(ICP-MS)對渝東北城口明中地區(qū)11件頁巖樣品的稀土元素及微量元素進行測試,結(jié)合前人所測巫溪田壩地區(qū)12件稀土、微量元素測試分析結(jié)果,全面分析了稀土元素、地球化學(xué)參數(shù)、空間分布規(guī)律及分布模式。研究表明:渝東北城口—巫溪地區(qū)頁巖稀土元素相對虧損,五峰組頁巖中的稀土元素略低于龍馬溪組;稀土元素總量∑REE與Sc,Ti,Cr,Zn,Zr,Nb,Th,Hf,Ta等大離子親石元素元素呈明顯正相關(guān),反映了研究區(qū)頁巖中稀土元素的來源主要為陸源碎屑;在五峰組頁巖早期沉積速率、稀土元素及微量元素比值的突變界面,可能是都勻運動(加里東運動第2幕)的影響范圍延伸至該地區(qū)所出現(xiàn)的沉積響應(yīng)。
[Abstract]:In order to find out the characteristics, sources and geological significance of rare earth elements in the shale of the Upper Ordovician Wufeng formation and Lower Silurian Longmaxi formation in Chengkou-Wuxi area of northeast Chongqing, The rare earth elements and trace elements of 11 shale samples in Chengkou area of northeast Chongqing were measured by inductively coupled plasma mass spectrometry (ICP-MS). The results of 12 rare earth elements and trace elements in Wuxi Tianba area were analyzed. The rare earth elements, geochemical parameters, spatial distribution and distribution model are comprehensively analyzed. The results show that the rare earth elements of shale in Chengkou-Wuxi area of northeast Chongqing are relatively depleted, the rare earth elements in the Wufeng formation are slightly lower than those in the Longmaxi formation, and the total amount of rare earth elements 鈭，

本文編號：2151870