中山大学学报自然科学版 ›› 2018, Vol. 57 ›› Issue (5): 19-28.

• 论文 • 上一篇    下一篇

广东省河源断裂带碳酸泉水化学特征及形成机制

李静荣1;王中正2;王亚2;邱晓林2;张珂2;李景富1   

  1. 1.广东省有色地质环境中心,广东 广州 510062;
    2.中山大学地球科学与工程学院∥广东省地质过程与矿产资源探查重点实验室, 广东 广州 510275
  • 收稿日期:2017-09-06 出版日期:2018-09-25 发布日期:2018-09-25
  • 通讯作者: 王亚(1981年生),女;研究方向:水文地质;E-mail:wangya9@mail.sysu.edu.cn

The chemical characteristics and formation mechanisms of carbonate springs along Heyuan fault zone, Guangdong Province#br# 

LI Jingrong1;WANG Zhongzheng2; WANG Ya2;QIU Xiaolin2;ZHANG Ke2; LI Jingfu1   

  1. 1.Nonferrous Geological Environment Center of Guangdong, Guangzhou 510062,China; 
    2.School of Earth Sciences and Geological Engineering// Key Laboratory of Geological Process and Mineral Resources Exploration in Guangdong Province, Sun Yat-sen University, Guangzhou 510275,China
  • Received:2017-09-06 Online:2018-09-25 Published:2018-09-25

摘要:

为了解广东省河源断裂带碳酸泉的形成机理,全面认识碳酸泉形成过程,为碳酸泉的开发与管理提供科学依据,在河源断裂带地区采集了5组碳酸泉样品及18组非碳酸泉样品,开展了水化学特征分析及δD、δ18O、14C、δ13C和3He/4He多种同位素分析。结果表明,碳酸泉主要水化学类型为Na-Ca-HCO3型。δD、δ18O同位素分别介于-43.32‰~-41.72‰和-7.06‰~-6.55‰,位于大气降水线附近,表明其补给来源于大气降水,补给高程在1 000~1 300 m。通过14C法测年及修正后的δ13C年龄校正模型计算得到碳酸泉的年龄在21~26 ka。碳酸泉点δ13C的变化范围在-1‰~2‰之间,R/Ra(样品3He/4He与大气3He/4He之比)比值介于0~2.5,表明河源断裂带碳酸泉中的CO2为幔源与变质混合成因,并以变质作用为主。

关键词: 断裂带, 碳酸泉, 水化学, 环境同位素

Abstract:

In order to understand the formation mechanisms of carbonated springs along Heyuan fault zone, Guangdong Province, comprehensively figure out their formation processes, and provide basic knowleges for their development and management, five groups of carbonated water samples and 18 groups noncarbonated water samples were collected  along the Heyuan fault zone, Guangdong Province, and their hydrochemical characteristics, δD、δ18O、14C、δ13C and 3He/4He isotopes were analyzed. The results showed that  Na-Ca-HCO3 is the main water chemistry type for the carbonated spring, and δD and δ18O isotopes are between -43.32‰~-41.72‰ and -7.06‰~-6.55‰, respectively. All the dots of groundwater smaples are located close to the atmospheric precipitation line, indicating that carbonated springs receive atmospheric precipitation recharging, and recharge elevation is between 1 000 m~1 300 m. The age of carbonated spring is calculated at 21~26 ka through the 14C method dating and the revised δ13C age correction model. The range of δ13C of carbonated springs is between -1‰ and 2‰, with the R/Ra  (the ratio of 3He/4He in samples to 3He/4He in atmosphere) ratio between 0 and 2.5, which indicates that CO2 gas in carbonated springs in the Heyuan fault zone is the source of mixing between mantle source and metamorphism, and is mainly based on metamorphism.

Key words: fault zone, carbonated spring, hydrochemical, environmental isotopes

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