西藏地热气体的地球化学特征及其地质意义
Geochemical charact eristics of geothermal gases and their geological implications in Tibet
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摘要: 西藏水热活动是青苦恼高原碰撞造山过程的产物,其成因类型、物质来源和时空分布与青藏高原的隆升过程密切相关,地热流体(气、液相)中携带有中上地壳乃至地幔物质的深部信息。西藏地热流体可以区分出CO2型和N2型两类气体,其中绝大多数的地热气体样品属于CO2型气体,而典型的N2型气体则较少。前者具有岩浆热源和深循环两种成因类型,后者都是深循环成因。西藏气体样品中的He含量变化范围非常宽,最高的可达到1.5%。在门士热泉,首次检测到地幔He组分,这说明西藏地壳深处有地幔物质侵位。根据He同位素组成推断,羊八井、谷露等处的地壳熔融体中约有3%的地幔组分。西藏地热气体中的N2和Ar组分主要是大气成因,CO2组分大多以海相碳酸盐岩成因为主,混有少量有机沉积物成因CO2。当Log(H2/Ar)处于-0.8-0.3的区间时,H2/Ar地热温度计可以良好地指示热储层的温度范围。实际调查表明:西藏水热活动区大多分布在斑公错-怒江链合带以南地区,高温水热活动区主要出现在雅鲁藏布缝合带和那曲-羊八井-亚东活动构造带沿线。
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Key words:
- Geothermal gases /
- Carbon isotope /
- Hydrothermal activities /
- Genesis /
- Tibet
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[1] [1]Arnorsson S, Fridriksson Th and Gunnarsson I. 1998. Gas geochemistry of the Krafla geothermal Field, Iceland. In: Arehart GB and Hulston JR(eds.) Proc. Ninth Internat Symp Water-Rock Interaction. Rotterdam: A A Balkema. 613-616
[2] [2]Arnorsson S and Gunnlaugsson E. 1985. New gas geothermometers for geothermal exploration - calibration and application. Geochim. Cosmochim. Acta, 49:1307-1325
[3] [3]Arnorsson S, Gunnlaugsson E and Svavarsson H. 1983. The chemistry of geothermal waters in Iceland, III: Chemical geothermometry in geothermal investigations. Geochim. Cosmochim. Acta, 47:567-577
[4] [4]Bottinga Y. 1969. Calculated fractionation factors for carbon and hydrogen isotope exchanges in the system calcite-carbon dioxide-granite-methane-hydrogen-water vapour. Geochim. Cosmochim. Acta, 33:49-64
[5] [5]Dai Jinxing, Dai Chunsen and Song Yan. 1994. Geochemical characteristics of natural gases in selected hot springs in China and their carbon, helium isotope compositions, Science in China. Serials B24:426-433 (in Chinese)
[6] [6]D\'Amore F and Truesdell A H. 1985. Calculation of geothermal reservoir temperatures and steam fraction from gas compositions. GRC Transaction, 9:305-310
[7] [7]D\'Amore F and Panichi C. 1980. Evaluation of deep temperatures in geothermal systems by a new gas geothermometer. Geochim. Cosmochim. Acta, 44:549-556
[8] [8]Ellis A J. 1957. Chemical equilibrium in magmatic gas. Am. J. Sci., 255:416-431
[9] [9]Ferrara G C, Ferrara G and Gonfiantini R. 1963. Carbon isotopic composition of carbon dioxide and methane from steam jets of Tuscany. In: Tongiorgi (ed.). Nuclear geology on geothermal areas. Spoleto, 277-284
[10] [10]Fournier R O. 1979. A revised equation for the Na/K geothermometer. GRC Transaction, 3:221-224
[11] [11]Giggenbach W F. 1992. The composition of gases in geothermal and volcanic systems as a function of tectonic setting. In: Kharaka Y K and Maest A S (eds.) Proc. Seventh Internat. Symp. Water-Rock Interaction. Rotterdam: A A Balkema. 873-878
[12] [12]Giggenbach W F. 1980. Geotheraml gas equilibrium. Geochim. Cosmochim. Acta, 44:2021-2032
[13] [13]Giggenbach W F and Goguel R L. 1989. Collection and analysis of geothermal and volcanic water and gas discharges. DSIR Report No. CD 2401, 1-81
[14] [14]Hochstein M P and Zhongke Yang. 1995. The Himalayan geothermal belt (Kashmir, Tibet, West Yunnan). In: Gupta L M and Yamano M (eds.). Terrestrial heat flow and geothermal energy in Asia. New Delhi: Oxford & IBH Publishing CO. PVT. LTD., 331-368
[15] [15]Hoefs J. 1978. Stable isotope geochemistry. New York: Springer-Verlag. 1-140
[16] [16]Hou Zengqian, Li Zhengqing, Qu Xiaoming, Gao Yongfeng, Hua Lichen, Zheng Mianping, Li Shengrong and Yuan Wanming. 2001. The uplifting processes of the Tibetan Plateau since 0.5 Ma B.P. - Evidence from hydrothermal activity in the Gangdise Belt. Science in China (Series D), 44 (Supp.):35-44
[17] [17]Hulston J R and Lyon J L. 1991. Isotopic evidence for the origin of methane from New Zealand geothermal system. Proc. Deep gas workshop, Hannover, May 1990. International Energy Agency Report.
[18] [18]Hulston J R and McCabe W J. 1962. Mass spectrometer measurements in the thermal areas of New Zealand, Part 2: Carbon isotopic rates. Geochim. Cosmochim. Acta, 26:300-410
[19] [19]Liao Zhijie, Zhao Ping, et al. 1999. Yunnan-Tibet Geothermal Belt - Geothermal resources and case histories. Beijing, Science Press, 1-153 (in Chinese with extended English abstract)
[20] [20]Mizutani Y and Rafter T A. 1969. Oxygen isotopic composition of sulphates - Part 3. Oxygen isotopic fractionation in the bisulphate ion-water system. New Zealand Journal of Science, 12:54-59
[21] [21]Nehring N L and D\'Amore F. 1984. Gas geochemistry of the Cerro Prieto, Mexico, geothermal field. Geothermics, 13:75-89
[22] [22]Shen Xianjie. 1996. Crust-mantle thermal structure and tectonothermal evolution of the Tibetan plateau. Beijing: Science Press. 1-224
[23] [23]Tong Wei, Liao Zhijie, Liu Shibin, Zhang Zhifei, You Maozheng, and Zang Mingtao. 2000. Thermal springs in Tibet. Beijing: Science Press, 1-153 (in Chinese)
[24] [24]Tong Wei and Zhang Mingtao. 1994. Thermal Springs in Hengduan Mountains. Beijing: Science Press, 1-326 (in Chinese)
[25] [25]Tong Wei and Zhang Mingtao. 1989. Geothermics in Tengchong. Beijing: Science Press, 1-262 (in Chinese)
[26] [26]Tong Wei, Zhang Mingtao, Zhang Zhifei, Liao Zhijie, You Maozheng, Zhu Meixiang, Guo Guoying and Liu Shibin. 1981. Geothermics in Tibet. Beijing: Science Press, 1-170 (in Chinese)
[27] [27]Xu S, Nakai S, Wakita H, Wang X. and Chen J. 1994. Helium isotopic compositions in Quaternary volcanic geothermal area near Indo-Eurasian collisional margin at Tengchong, China. In: Matsuda (ed.). Noble Gas Geochemistry and Cosmochemistry. Tokyo: TERRAPUB. 305-313
[28] [28]Yokoyama T, Nakai S and Wakita H. 1999. Helium and carbon isotopic compositions of hot spring gases in the Tibetan Plateau. J. Volcan. Geochem. Res., 88:99-107
[29] [29]Zhao Ping and Armannsson H. 1996. Evaluation and interpretation of gas geothermometry results from selected Icelandic geothermal fields with comparative examples from Kenya. Geothermics, 25(3):307-347
[30] [30]Zhao Ping, Dor Ji, Liang Tingli, Jin Jian and Zhang Haizheng. 1998. Characteristics of gas geochemistry in the Yangbajain geothermal field, Tibet. Chinese Science Bulletin, 43(21):1770-1777
[31] [31]Zhao Ping, Jin Jian, Dor Ji and Liang Tingli. 1997. Deep geothermal resources in the Yangbajain field, Tibet. GRC Transactions, 21:227-230
[32] [32]Zhao Ping, Liao Zhijie, Guo Guoying and Zhao Fengshan. 1996. Steam quantitative analysis and its implication in the Rehai geothermal field, Tengchong. Chinese Science Bulletin, 41:501-505
[33] [33]Zhao Ping, Kennedy M, Dor Ji, Xie Ejun, Du Shaoping, Shuster D and Jin Jian. 2001. Noble gases constraints on the origin and evolution of geothermal fluids from the Yangbajain geothermal field, Tibet. Acta Petrologica Sinica, 17(3):497-503 (in Chinese with English alstract)
[34] [34]Zheng Mianping, Liu Jie, Dor Ji and Pingcuo Wangjie. 1995. A new type of cesium deposit - cesium-bearing geyserite. Beijing: Geological Publishing House, 1-77
[35] [35]Zhu Meixiang and Xu Yong. 1993. Hydrothermal alternation and evaluation in the Yangyi geothermal field of Tibet, China. In: Ren Xiang, Liu Shibin and Dunzhujiacan (eds.). Proceedings of the utilization of high temperature geothermal resources in Tibet. Beijing: Geological Publishing House, 125-133 (in Chinese with English abstract)
[36] [36]戴金星, 戴春森, 宋岩. 1994. 中国一些地区温泉中天然气的地球化学特征及碳、氦同位素组成. 中国科学(B辑), 24:426-433
[37] [37]侯增谦, 李振清, 曲晓明, 高永丰, 华力臣, 郑绵平, 李胜荣, 袁万明. 2001. 0.5Ma以来的青藏高原隆升过程--来自冈底斯带热水活动的证据. 中国科学(D辑), 44(增刊):27-33
[38] [38]廖志杰, 赵平等. 1999. 滇藏地热带--地热资源和典型地热系统. 北京:科学出版社, 1-153
[39] [39]佟伟, 廖志杰, 刘时彬, 张知非, 由懋正, 章铭陶. 2000. 西藏温泉志. 北京:科学出版社, 1-300
[40] [40]佟伟, 章铭陶编. 1994. 横断山区温泉志. 北京:科学出版社, 1-326
[41] [41]佟伟, 章铭陶编. 1989. 腾冲地热. 北京:科学出版社, 1-262
[42] [42]佟伟, 章铭陶, 张知非, 廖志杰, 由懋正, 朱梅湘, 过帼颖, 刘时彬编. 1981. 西藏地热. 北京:科学出版社, 1-170
[43] [43]赵平, Kennedy M, 多吉, Shuster D, 谢鄂军, 杜少平, 金建. 2001. 西藏羊八井热田地热流体成因及演化的惰性气体制约. 岩石学报, 17:497-503
[44] [44]朱梅湘, 徐勇. 1993. 羊易地热田的水热蚀变及其热田演化. 见: 任湘, 刘时彬, 顿主佳参主编. 中国西藏高温地热开发和利用国际研讨会论文集. 北京:地质出版社, 125-133
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