【摘要】 根据水化学分析和稳定碳同位素的测试数据,本文计算了四川康定温泉热水和热储的CO₂含量和深源CO₂的释放量,探讨了热水中CO₂的成因。温泉热水中CO₂含量最高为1840.16 mg/L,平均为1060.53 mg/L,属于富含深源CO₂的温泉系统。热水和CO₂气的碳同位素揭示深源CO₂的成因为幔源和碳酸盐岩变质脱气以及两者的混合。康定12个温泉深源CO₂的排出量为1766.43 t/a,其中至少40％呈气相直接排入大气,其余进入水圈,证实我国西部众多温泉是深源CO₂释放的一种重要途径。更多还原

【Abstract】 In hot water of the hot springs in the Kangding area, the highest CO, content is 1840. 16 mg/L, the average 1060. 53 mg/L, which shows that the hot springs contain rich deep-source CO2.The data of stable carbon isotopes of the hot water, CO2 gas in hot springs and limestone in Kangding, indicates that the deep-source CO2 is of the mantle origin or metamorphic origin or a mixture of the two. The δ13C values of CO2 in the hot springs of Kangding range from -4. 3‰ to -5. 4‰, typical of the mantle origin; the δ 13C value in the Erdaoqiao area is -5. 4‰, but the δ 13C value of CO2 in hot water lie between 0. 0‰ and 2. 8‰, all exceeding 0‰, so that the dissolved CO2 should come from metamorphosed carbonate rocks; the δ 13C value of CO2 in the Yulingong area is -4. 3‰ , but those of dissolved CO2 range from -3. 6‰ to -0. 1‰, mixture of mantle-derived and metamorphic CO2.The discharge amount of deep-source CO2 refers to the amount of CO2 discharged from the depth of the Earth into the atmosphere and hydrosphere along with the hot water. The discharge amount of CO2 of 12 hot springs in Kangding is 1766. 43 t/a. When the hot water flows to the surface, the pressure is lowered, so that part of dissolved CO2 is changed into the gaseous state and released to the atmosphere. With the flow distance increased, the releasing amount decreases, showing a tendency of gradual diging out. Field measured data in the Kangding area reveal that the released amount is 40% at least of the discharged amount, while the remaining enter the hydrosphere with the hot water. It seems that the numerous hot springs in western China serve as one of the important channel way for the release of the deep- source CO2.更多还原