SEISMOLOGY AND EGOLOGY ›› 1979, Vol. 1 ›› Issue (2): 86-93.

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A NOTE ON CARBON-DIOXIDE DISCHARGING ZONES AND THEIR SEISMICITIES IN CHINA

Shi Huixin   

  1. Beijing Seismologioal Brigade
  • Received:1978-11-30 Online:1979-06-06 Published:2009-11-25

中国碳酸水出露带分布特征简介

石慧馨   

  1. 北京市地震队

Abstract: This paper deals with the distribution of carbon-dioxide discharging localities in China (where CO2 gas content is >90% and water with dissolved CO2 >1g/l or with bicarbonate more than 1g/l), characteristics of water quality and the seismic activities of various carbon-dioxide discharging zones. The source of CO2 fluids is also studied herein. It is suggested that the highly seismic activities are mostly associated with the zones of warm and hot springs rich in carbon-dioxide, but scarcely with the zones of cold carbon-dioxide springs. Warm and hot carbon-dioxide springs occur mainly in seis-mically active zones with strong neotectonic movements, such as in southern Xizang (Tibet) where the highly seismic activities are accompanied with regional metamorphism. Moreover, in area of heat flow anomaly probably there also occurred magmatic intrusion which brought about contact metamorphism and through all of these processes carbon-dioxide may be released. Cold carbon-dioxide springs are discharged in seismically less active zones, such as in Northeast China, where tectonic movements and magmatic activities became gradually quiescent. Carbon-dioxide appears to be released slowly from magma which cooled down under a relatively closed condition in the post-volcanic period, and it miaght be the released gases conserved in the altered surrounding rocks affected by volcanic magma. Meanwhile, the cold carbon-dioxide springs originated by mixing CO2 fluid with shallow groundwater.In the seismically active zones within depressions subsides since Cenozoic time, such as in North China, the warm and hot carbon-dioxide springs have not been found at the ground surface, owing to the thick covers, but in the case of deep-seated ground-water hot carbon-dioxide water was discovered. Intensive studies of the origin and distribution of CO2 fluids will be significant to understanding the recent stress field, seis-micity and regional metamorphism. It must be stressed that great effort must be made in the studies of mountainous areas, such as the Kunlun-Szechuan-Yunnan, Tienshan, Chilien. Moreover, the analysis of stable carbon isotopes from discharges of CO2 fluids should also be carried out.

摘要: 本文举例阐述了我国碳酸水出露点的分布、水质特征及各类型碳酸水出露带的地震活动性,并探讨了二氧化碳的来源。认为深入研究碳酸水成因和分布特征对研究近代构造应力场、地震活动性、现代正在进行着的变质作用等是有意义的。