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重大地質(zhì)轉(zhuǎn)折期的碳、硫循環(huán)與環(huán)境演變

時(shí)間:2023-04-25 20:29:46 環(huán)境保護(hù)論文 我要投稿
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重大地質(zhì)轉(zhuǎn)折期的碳、硫循環(huán)與環(huán)境演變

摘要: 碳、硫在表層儲(chǔ)庫和地質(zhì)儲(chǔ)庫以不同的形式相互轉(zhuǎn)換,在這個(gè)過程中都伴隨著一定的同位素分餾.碳同位素的分餾主要受到光合作用以及海水溶解無機(jī)碳與大氣CO_2交換的控制,而硫同位素的分餾則主要受控于硫酸鹽細(xì)菌還原作用.表層儲(chǔ)庫碳、硫同位素的組成通過地質(zhì)作用被很好地保存在地質(zhì)儲(chǔ)庫中,因此通過對地質(zhì)儲(chǔ)庫中碳、硫同位素的分析和研究,可以很好地了解地球各圈層相互作用的規(guī)律,重塑地質(zhì)歷史特別是重大關(guān)鍵轉(zhuǎn)折時(shí)期的演化過程.同時(shí)文中借助一些碳、硫同位素應(yīng)用實(shí)例,進(jìn)一步加深理解影響碳、硫同位素組成和變化的原因,以提高對不同時(shí)期全球環(huán)境變化的認(rèn)知程度. Abstract: Stable isotopes of carbon and sulphur are fractionated during cycling between surface reservoirs and geological reservoirs. The main processes that control the isotopic composition of various reservoirs are photosynthesis and equilibrium between oceanic dissolved inorganic carbon and atmospheric CO_2 for carbon, and bacterial sulphate reduction for sulphur. C-S cycling from surface reservoirs and stored in geological reservoirs provides a geological record of ancient isotopic compositions. These isotopic signals can be used to improve and refine our understanding of historical changes in global geochemical cycles through geological time, especially for some key transitional periods. A number of case studies with detailed applications of these principles have been discussed to illustrate the causes and effects of ancient global environmental change. 作 者: 汪建國    陳代釗    嚴(yán)德天    Wang Jianguo    Chen Daizhao    Yan Detian   作者單位: 汪建國,陳代釗,Wang Jianguo,Chen Daizhao(中國科學(xué)院,地質(zhì)與地球物理研究所,北京,100029)

嚴(yán)德天,Yan Detian(中國地質(zhì)大學(xué)(武漢)生物地質(zhì)與環(huán)境地質(zhì)教育部重點(diǎn)實(shí)驗(yàn)室,湖北,武漢,430074) 

期 刊: 地學(xué)前緣  ISTICPKU   Journal: EARTH SCIENCE FRONTIERS  年,卷(期): 2009, 16(6)  分類號(hào): X142 P597  關(guān)鍵詞: 碳、硫循環(huán)    同位素分餾    光合作用    細(xì)菌硫酸鹽還原作用    生物大滅絕    Keywords: carbon and sulphur cycles    isotope fractionation    photosynthesis    bacterial sulphate reduction    the mass extinction   

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