【摘要】：分析了三峽地區(qū)埃迪卡拉系至下寒武統(tǒng)(E-ε_(tái)1)地層中硒(Se)的含量分布富集規(guī)律,探討了Se的顯著和非顯著富集層的元素地球化學(xué)特征.結(jié)果表明,Se為E-ε_(tái)1地層中最富集(濃集)的元素,其富集系數(shù)EF(與上地殼平均元素含量相比)和濃集系數(shù)CC(與同類巖性相比)均值分別為26.97和48.04.富集系數(shù)EF′(Al標(biāo)準(zhǔn)化之后的EF)指示.Se為第二富集的元素(Se~(EF′)=218.73),低于Cd(Cd~(EF′)=288.46),遠(yuǎn)高于第三富集的微量元素As(As~(EF′)=97.49).Se在E-ε_(tái)1地層中含量范圍為10.5~30.08ppm,算數(shù)均值為1.35ppm.相對于南沱組(Se~(EF)=2.29),E-ε_(tái)1地層中Se~(EF)值增加11.78倍.其EF均值呈現(xiàn)為水井沱組(92.58)巖家河組(54.45)陡山沱組(24.72)燈影組(2.48)石牌組(1.95)天河板組下部(1.24).E-ε_(tái)1地層中Se的含量較服從自然對數(shù)正態(tài)分布,表現(xiàn)出正偏態(tài)分布類型.Se顯著富集(EF10)的層位主要包括陡II下部、陡II上部、陡III頂部、陡IV、巖家河組底部和上部、水井沱組下部和上部.元素地球化學(xué)特征表明:Se顯著富集層中Se含量普遍受陸源碎屑的影響,還受熱液、火山碎屑、深部物源等單一或多因素的共同作用.此外,黃鐵礦對部分層位(陡II上部、陡IV和水井沱組上部)及有機(jī)質(zhì)對部分層位(陡II下部和水井沱組上部)中Se的富集具有促進(jìn)作用.Se的非顯著富集層(除陡I、水井沱組中部、石牌組和天河板組下部外)中Se含量仍受陸源碎屑影響,而其他的因素(熱液、火山碎屑和深部物源等)的活動(dòng)普遍較弱.
[Abstract]:The distribution and enrichment of selenium and (Se) in the Edikala and Lower Cambrian (E- 蔚 _ 1) strata in the three Gorges area are analyzed, and the geochemical characteristics of the significant and non-significant enrichment layers of Se are discussed. The results show that Se is the most enriched (concentrated) element in E- 蔚 _ 1 formation, and the mean values of EF (compared with the average element content of upper crust) and CC (compared with similar lithology) are 26.97 and 48.04, respectively. The enrichment coefficient EF' (EF after Al standardization) indicates that Se is the second enriched element (Se~ (EF') = 218.73), lower than Cd (Cd~ (EF') = 288.46), and far higher than that of the third enriched trace element As (As~ (EF') = 97.49). Se) in the E- 蔚 _ 1 formation with a range of 10.530.08 ppm and a mean value of 1.35 ppm. Compared with the Nantuo formation (Se~ (EF) = 2.29), the Se~ (EF) value in the E- 蔚 _ 1 formation increases 11.78 times. The EF mean value is that the content of Se in the Jingtuo formation (92.58), the Yanjiahe formation (54.45), the Doushantuo formation (24.72), the Dengying formation (2.48), the Shipai formation (1.95), the lower part of the Tianheban formation (1.24). The content of Se in the E- 蔚 _ 1 formation is more normal than that in natural logarithmic normal distribution. The layers of Se significant enrichment (EF10) mainly include the lower part of steep II, the upper part of steep II, the top of steep III, the bottom and upper part of Yanjiahe formation of steep IV, and the lower and upper part of Shuituo formation. The geochemical characteristics of elements indicate that the content of Se in the significant enrichment layer of Se is generally affected by continental clasts, and also by single or multiple factors, such as hydrothermal solution, volcanic clastic, deep provenance and so on. In addition, pyrite is opposite to part of the horizon (steep II upper, The enrichment of Se in some layers (the lower part of steep II and the upper part of Shuituo formation) is promoted by organic matter and the upper part of steep IV and Shuituo formation. The Se content in the lower part of Shipai formation and Tianheban formation is still affected by continental clastic, while the activity of other factors (hydrothermal, pyroclastic and deep provenance, etc.) is generally weak.
【作者單位】： 中國科學(xué)院地理科學(xué)與資源研究所;中國科學(xué)院大學(xué)資源與環(huán)境學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(批準(zhǔn)號(hào):41172310,41472322) 國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃項(xiàng)目(編號(hào):2014CB238906)資助
【分類號(hào)】：P534;P595

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