郯庐断裂带温泉气体地球化学

郯庐断裂带温泉气体地球化学

刘德良1，陶士振2，张朝明3

1. 中国科学技术大学地球和空间科学系，安徽合肥 230026; 2. 中国石油勘探开发研究院，北京100083; 3. 安徽省地震局，安徽合肥 230011

收稿日期:2001-03-20 修回日期:2001-03-20 出版日期:2001-03-20 发布日期:2001-03-20

Gas Geochemistry of Warm Springs in Tan-Lu Fault Belt

LIU De-liang; TAO Shi-zhen; ZHANG Chao-ming

1. Department of Earth and Space Sciences, China University of Science and Technology, Hefei 230026; 2. Research Institute of Petroleum Exploration and Development, CNPC, Beijing 100083; 3. Research Center for Earthquake Forecast, Anhui Earthquake Bureau, Hefei 230031, China

Received:2001-03-20 Revised:2001-03-20 Online:2001-03-20 Published:2001-03-20

摘要/Abstract

摘要： 断裂构造带温气体成分及同位素组成特征直接指示断裂带的构造活动及水化学特征。郯庐断裂带温泉气体成分以N2为主（多数大于90％），CO2含量较低（多数小于1％）。δCco2在南北不同地段存在明显差异，北段为－5．8‰－－7．8‰，CO2主要为岩石化学成因。而中段和南段δ^13Cco2均小于－10‰，CO2有机成因。^40Ar/^36Ar为295－363，其中较低者（300左右）主要来源于大气，较高者来自地壳岩石中^40K的衰变。本文研究成果不仅有助于探讨断裂带不同地段温泉气体的组成及其来源，而且有助于揭示郯庐断裂带构造－岩浆活动及水文地球化学特征。

Abstract: The gas compositions and isotope compositions of warm springs in fault structure zones directly indicate structure activity and hydrogeochemical characteristics in the fault zones. N2 is the major gas component(90% or so) of warm springs in Tan-Lu fault belt. There is an obvious difference in δ13C CO2 for different sections of the fault zone. Theδ13C CO2 values in northern section are –4.3‰ ～7.8‰ ，and the CO2 is inorganic in origin，produced by petrochemical evolution of the rocks. Theδ13C CO2 values in central and southern sections are lower than -10‰ ，and the CO2 is organogenic. 40Ar/36Ar vary from 295 to 363，in which the lower ratios stem from atmosphere. and the higher ratios from the decay of K in the rocks of the earth crust. This paper not only studies the gas compositions of warm springs in different sections of Tan-Lu fault belt and their origin，but also is important in revealing the tectono-magmatic activity and hydrogeochemical characteristics of the fault belt.

刘德良，陶士振，张朝明. 郯庐断裂带温泉气体地球化学[J]. J4.

LIU De-liang; TAO Shi-zhen; ZHANG Chao-ming. Gas Geochemistry of Warm Springs in Tan-Lu Fault Belt[J]. J4.