發(fā)布時(shí)間：2018-02-23 19:39

  本文關(guān)鍵詞： 埃迪卡拉紀(jì) 陡山沱組 硒的富集 古海洋環(huán)境 Mo-U關(guān)系 硒同位素　出處：《貴州大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：新元古代-早寒武世發(fā)生了地質(zhì)歷史上第二次大氧化事件,沉積巖中的氧化還原敏感元素在這一時(shí)期出現(xiàn)富集。分散元素硒是典型的氧化還原敏感元素,沉積巖中硒的富集可以指示海洋氧化環(huán)境的變化。為了討論這一時(shí)期海洋氧化還原條件及硒的富集條件,本文所取上揚(yáng)子地區(qū)6條陡山沱組剖面,白果園剖面、九龍灣剖面、陳家院子剖面、五河剖面、南皋剖面和三都剖面,對第四段黑色頁巖的總硒含量,主量元素,微量元素及硒同位素的系統(tǒng)分析研究,初步的認(rèn)識包括:(1)總硒含量測試測結(jié)果顯示所測六個剖面黑色頁巖Se均遠(yuǎn)高于Se的地殼豐度(0.05ppm),形成了不同程度的富集。硒的富集隨剖面深度的增加而減弱。在白果園剖面、九龍灣剖面、陳家院子剖面、五河剖面,其黑色頁巖的Se含量主要來自陸源風(fēng)化物質(zhì)的輸入;而南皋剖面和三都剖面的黑色頁巖中的Se可能來自陸源物質(zhì)輸入和熱水(氧化性流體)物質(zhì)。陡山沱組第四段黑色頁巖Se元素的富集與Co、Ag、V等氧化還原敏感元素都有不同程度的相關(guān)性,反映了不同剖面Se的地球化學(xué)行為的區(qū)別。Se含量與Co含量的相關(guān)性反映了Se的富集與生物作用的關(guān)系;Se含量與Ag含量、Se含量與V含量的關(guān)系則暗示了Se(-Ⅱ)與Ag、V的結(jié)合物并形成共同富集。(2)結(jié)合Mo-U體系指示了這一時(shí)期上揚(yáng)子板塊不同程度的缺氧環(huán)境,對Se富集的影響進(jìn)行探究:白果園剖面位于淺海相,主要為缺氧環(huán)境,陸源物質(zhì)最為豐富,Se的富集程度最高;九龍灣剖面可能處于更深的穩(wěn)定硫化水體位置,有較為穩(wěn)定的缺氧(硫化)環(huán)境,Se被充分轉(zhuǎn)化為還原態(tài)并與Ag、V結(jié)合形成富集;陳家園子剖面可能處于硫化水體的下緣,海洋環(huán)境的缺氧程度存在波動,富集程度略低于九龍灣剖面;貴州黔東南五河剖面處于斜坡相,硫化水體間歇出現(xiàn),為較穩(wěn)定的缺氧環(huán)境,Se的富集程度與陳家園子剖面相似;貴州黔東南南皋剖面處于斜坡相,生物作用較為薄弱,Se的富集程度低;貴州黔東南三都剖面處于斜坡相向深海相過渡的地帶,為鐵化海水環(huán)境,Se的富集程度最低。(3)結(jié)合實(shí)測的硒同位素?cái)?shù)據(jù)和同時(shí)代前人數(shù)據(jù)對比,對海洋中硒同位素分餾的分層情況做了簡單分析。淺海相陳家園子剖面陡山沱組第四段黑色頁巖δ82/76Se的變化范圍為0.30‰~1.65‰,平均值為0.73‰,偏向重的硒同位素組成。Srtandmann等(2015)對陡山沱斜坡相(斜坡相)的黑色頁巖測試δ82/76Se值范圍為-0.84~0.48‰,平均值為指示所處古海洋環(huán)境可能為厭氧和富鐵的海水環(huán)境,輕的硒同位素分餾潛在的指示了其缺氧鐵化的海洋環(huán)境。(4)綜合前人數(shù)據(jù),海洋中的無機(jī)態(tài)硒Se(Ⅳ)和Se(Ⅵ)在含氧環(huán)境中無機(jī)態(tài)硒可以通過吸附作用部分進(jìn)入深海沉積物中,而在缺氧或靜海環(huán)境中可以部分轉(zhuǎn)化為Se(0)或形成Se(-II)進(jìn)入沉積物。在低氧至缺氧/靜海環(huán)境中,在沉積物中Se(Ⅳ)和Se(Ⅵ)也可以轉(zhuǎn)化為Se(0)或Se(-II)。上揚(yáng)子板塊埃迪卡拉紀(jì)陡山沱組第四段黑色頁巖硒的富集作用跟海平面上升、生物作用、硫化楔、鐵化水體和不穩(wěn)定的缺氧海洋環(huán)境有關(guān),不同剖面的區(qū)域因素也造成了富集程度的差異。
[Abstract]:The Neoproterozoic Early Cambrian happened second times in the geological history of the great oxidation event, the oxidation of sedimentary rocks in the reduction of sensitive elements in this period. Enrichment of dispersed elements selenium is typical of redox sensitive elements in sedimentary rocks, selenium enrichment can indicate marine oxidation changes in the environment. In order to discuss the enrichment conditions during the period of oceanic redox conditions and selenium, the upper Yangtze region 6 Doushantuo Formation section, Baiguoyuan section, Jiulongwan section, Chen courtyard section, Wuhe section, South Gao profile and Sandu section, the total selenium content of fourth black shale, major elements, trace analysis system the elements and selenium isotopes, preliminary understanding include: (1) test total selenium content measurement results show that the crustal abundance measured by the six sections of the black shale Se was much higher than that of Se (0.05ppm), forming a different degree of enrichment of selenium enrichment with cesarean section. The increase of the surface depth decreases. In the orchard white section, the Jiulongwan section, Chen courtyard section, five profile, Se contents of the black shale mainly from terrigenous weathered material input; and the south bank section and Sandu section in the black shale Se may come from terrigenous input and hot water (oxidizing fluid) material. Enriched with Co, Doushantuo Formation fourth black shale Se elements Ag, V and other redox sensitive elements have different degree of correlation, reflect the correlation of the geochemical behavior of different profiles of Se difference between.Se content and Co content reflects the relationship between the enrichment and the biological effect of Se Se content and Ag content; and the relationship between Se content and V content, suggesting that Se (II) and Ag, V conjugates and the formation of common enrichment. (2) combined with the Mo-U system indicates that this period of the Yangtze plate in different hypoxia environment, to explore the effects of Se enrichment: Baiguoyuan section located in neritic facies, mainly for anoxic environment, the most abundant terrestrial material, Se enrichment degree is the highest; the Jiulongwan section may be in a stable position of deeper water curing, oxygen stable (vulcanization) environment, Se is fully transformed into reduced and Ag, V combined with the formation of enrichment; the lower edge of Chen home section may be in sub water curing, the degree of hypoxia of the marine environment fluctuates and enrichment degree is slightly lower than the Jiulongwan section; Guizhou Qiandongnan Wuhe section in slope facies, sulfide water intermittent, anoxic environment is stable, the degree of Se enrichment and Chen home sub section is similar to Guizhou Qiandongnan south bank section; in the slope. The biological effect is relatively weak, the enrichment degree of Se low profile in Guizhou; Qiandongnan Sandu slope transition zone to deep sea facies, marine environment for iron, Se enrichment degree (3) with the lowest. Selenium isotopic data measured and previous data at the same time of contrast, layered selenium isotope fractionation in the sea to do a simple analysis. The variation range of the neritic sub section of Chen Jia Yuan Doushantuo Formation fourth black shale delta 0.30 82/76Se% ~1.65%, the average value was 0.73 per thousand, selenium isotope composition of.Srtandmann heavy bias and (2015) of the Doushantuo slope (slope) of the black shale test 82/76Se values in the range of -0.84~0.48%, the average value is indicative of ancient marine environment for anaerobic and iron rich seawater, light selenium isotope fractionation potential indicates the hypoxia iron environment. (4 based on previous data), inorganic selenium in oceanic Se (IV) and Se (VI) in oxygen environment in inorganic selenium by adsorption into the deep-sea sediments, while in hypoxia or the environment in Jinghai can be partially converted into Se (0) or Se (- form II) into the sediments. In hypoxia to hypoxia / environment in Jinghai, in the sediment Se (IV) and Se (VI) can also be converted to Se (0) or Se (-II) on the Yangtze plate. Eddie from the Doushantuo Formation of fourth black shale selenium enrichment with sea-level rise, biological effect wedge iron, sulfide, water and unstable anoxic marine environment, regional factors of different sections also caused different degrees of enrichment.

【學(xué)位授予單位】：貴州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：P595

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