本文選題：CO釋放通量　切入點(diǎn)：火山-地?zé)釁^(qū)　出處：《巖石學(xué)報(bào)》2017年01期 　論文類型：期刊論文

【摘要】：印度-亞洲大陸俯沖帶是地球深部碳循環(huán)的重要場所,在全球氣候變化研究中占有至關(guān)重要的地位。谷露-亞東裂谷是青藏高原南部規(guī)模最大、延伸最長的近NS向拉張性裂谷,裂谷內(nèi)出露新生代火山巖和多處大規(guī)模地?zé)釁^(qū),正在向大氣圈釋放巨量的溫室氣體。利用密閉氣室法測量并計(jì)算得出的谷露和羊應(yīng)火山-地?zé)釁^(qū)的土壤微滲漏CO_2的平均釋放通量分別為436.8g·m~(-2)·day~(-1)和99.0g·m~(-2)·day~(-1),接近具有潛在噴發(fā)危險(xiǎn)的美國黃石公園火山-地?zé)釁^(qū)(410g·m~(-2)·day~(-1))和加利福尼亞州Mammoth Mountain火山區(qū)(107.9g·m~(-2)·day~(-1))的CO_2平均釋放通量,表明谷露-亞東裂谷的深部地?zé)崃黧w活動異常強(qiáng)烈。此外,在野外考察的基礎(chǔ)上,通過實(shí)驗(yàn)室測試和理論計(jì)算估算了谷露-亞東裂谷每年以土壤微滲漏的形式向當(dāng)今大氣圈釋放的CO_2總量約為1.76×107t,與西特提斯俯沖帶前緣的意大利Apennine火山區(qū)CO_2的釋放總量(1.32×10~7t·a~(-1))屬于同一個數(shù)量級。因此,印度-亞洲大陸俯沖帶是全球地質(zhì)碳脫氣的重要場所。氣體地球化學(xué)特征顯示,谷露-亞東裂谷內(nèi)火山-地?zé)釟怏w的He同位素比值(0.10~0.29RA,RA為大氣3He/4He比值)和δ~(13)CCO_2值(-7.20‰~-0.78‰)在空間分布上表現(xiàn)為,從南至北呈逐漸遞增的變化特征,顯示裂谷內(nèi)火山-地?zé)釁^(qū)氣體在南北方向上可能具有不同的動力學(xué)成因機(jī)制。具體來講,δ~(13)CCO_2值自南向北遞增的趨勢,可能與裂谷南北方向地層巖性存在差異有關(guān);裂谷內(nèi)火山-地?zé)釟怏w的He同位素比值高于0.1RA,揭示"重要的地幔組分",同時裂谷內(nèi)地幔來源的流體組分從南向北逐漸遞增的趨勢表明,印度大陸巖石圈的向北俯沖作用是導(dǎo)致谷露-亞東裂谷內(nèi)劇烈的水熱活動和大規(guī)模溫室氣體釋放最終的動力來源和成因機(jī)制。
[Abstract]:India - Asia continent subduction zone is an important place for the earth deep carbon cycle, plays an important role in the study of global climate change. Ya Dong Gulu rift is the size of the southern Tibetan Plateau, nearly NS of the longest extension to the extensional rift, outcropping Cenozoic volcano rock and many large-scale geothermal area inside Valley, is the release of greenhouse gases to the atmosphere. A huge amount of using closed chamber method to measure and calculate the Gulu and sheep should average flux of volcano geothermal zone soil microleakage of CO_2 were 436.8g m~ (-2) - day~ (-1) and 99.0g m~ (-2) - day~ (-1), close to the Yellowstone National Park volcano geothermal region has a potential danger of eruption (410g - m~ (-2) - day~ (-1)) and the California Mammoth Mountain volcano area (107.9g - m~ (-2) - day~ (-1) CO_2) the average flux shows that Gulu - deep geothermal fluid Ya Dong the same rift Very strong. In addition, based on the field investigation, laboratory test and theoretical calculation of the estimated amount of CO_2 - Ya Dong Gulu rift to the release of the annual atmosphere by soil micro leakage in the form of about 1.76 * 107t, the total release of front and Tethys subduction zone of Italy SETRA Apennine CO_2 (the 1.32 mountain fire * 10~7t a~ (-1)) belong to the same order of magnitude. Therefore, India - Asia continent subduction zone is an important place for global carbon degassing. According to geological geochemical characteristics of gases, Gulu Geothermal Gas - volcano - Ya Dong rift within the He isotope ratios (0.10~0.29RA, RA for atmospheric 3He/4He ratio) and delta. (13) CCO_2 value (-7.20% ~-0.78%) manifested in the spatial distribution, variation is gradually increasing from south to north, display volcano geothermal region gas in the rift may have different genetic dynamics mechanism in the north-south direction. Specifically, 8 ~ (1 3) the CCO_2 value increasing trend from south to north, the differences may be related to the Rift Valley north-south direction of stratum and lithology; He isotope ratios of volcano geothermal gases within the rift is higher than 0.1RA, reveal "an important component of the mantle, and the mantle derived fluid group rift points increases gradually from the South to the north of India, the trend shows that the lithosphere of the northward subduction to Gulu hydrothermal activity in the Ya Dong Valley and large-scale greenhouse gas release power source end and formation mechanism.

【作者單位】： 中國科學(xué)院地質(zhì)與地球物理研究所新生代地質(zhì)與環(huán)境重點(diǎn)實(shí)驗(yàn)室;中國科學(xué)院地質(zhì)與地球物理研究所油氣資源研究重點(diǎn)實(shí)驗(yàn)室;
【基金】：中國科學(xué)院戰(zhàn)略性先導(dǎo)科技專項(xiàng)(B類)(XDB03010600) 國家自然科學(xué)基金項(xiàng)目(41602341、41572321)聯(lián)合資助
【分類號】：P317;P593;P314

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