川西北地区典型钙华景观钙华中重金属元素空间分布特征及物源解析  

SPATIAL DISTRIBUTION AND SOURCE ANALYSIS OF HEAVY METAL ELEMENTS IN TYPICAL TRAVERTINE LANDSCAPES IN NORTHWEST SICHUAN

作　　者：曾子馨 唐浩鹏 马尉斌 王永敏[1] 王定勇[1] Zeng Zixin;Tang Haopeng;Ma Weibin;Wang Yongmin;Wang Dingyong(College of Resources and Environment,Southwest University,Beibei,Chongqing400715,China;Institute of Imnowation&Entrepreneurship,Southwest University,Beibei,Chongqing 400715 China)

机构地区：[1]西南大学资源环境学院,重庆400715 [2]西南大学创新创业学院,重庆400715

出　　处：《矿物岩石》2022年第3期111-122,共12页Mineralogy and Petrology

基　　金：国家自然科学基金项目(批准号:41877384);大学生创新训练项目(编号:202110635100,X202110635382)。

摘　　要：钙华作为陆相碳酸盐沉积的一种,一直以来被认为是高分辨古气候重建的重要载体,为探究不同区域沉积的钙华中重金属元素含量及来源是否存在差别,本研究选取黄龙、神仙池、卡龙沟等典型钙华景观为研究区,分别测定了钙华中Cr,Ni,Cu,Zn,As,Rb,Sr,Ba,Pb,Hg,U等11种重金属元素含量以及Ca,Mg两种常量元素的含量,并通过PMF模型对钙华中重金属元素的可能来源进行解析。Mg/Ca比值的差异表明不同区域形成钙华的基岩组分不同,Rb/Sr比值大小依次为黄龙>卡龙沟>神仙池,基岩风化过程产生的颗粒物在黄龙的钙华沉积中占比更高。钙华中风化产生的颗粒物组分存在显著性差异。重金属元素含量整体表现出黄龙>神仙池>卡龙沟的趋势,且三个区域大部分的重金属元素都在沟口显著升高,重金属元素含量的升高可能受人为活动的影响。总体来说,三个区域钙华中重金属元素含量处于较低水平,生态危害较弱。PMF模型结果表明,钙华中重金属元素可能来源大气沉降、地下泉水汇入的地质背景源以及地表径流输入。黄龙钙华中的大部分重金属元素以地表径流源为主,神仙池则以地质背景源为主,不同来源对卡龙沟钙华的大部分重金属元素的贡献相近。然而,钙华中重金属元素来源极其复杂,如需厘清其来源仍需要开展更为系统的研究工作。As a kind of terrestrial carbonate deposition,travertine has always been considered an important carrier for paleoclimate reconstruction.To explore whether there are differences in the content and sources of calcium and heavy metals deposited in different regions of central China,typical travertine landscapes such as Huanglong,Shenxianchi and Kalonggou were selected as research areas.The contents of 11 heavy metal elements(Cr,Ni,Cu,Zn,As,Rb,Sr,Ba,Pb,Hg and U)and two major elements(Ca,Mg)in travertine are determined,and the possible sources of heavy metals in travertine are analyzed by PMF model.The difference of Mg/Ca ratio indicates that the bedrock components of travertine formation differ from region to region,and the Rb/Sr ratio is in the order of Huanglong>Kalonggou>Shenshenchi.The particulate matter generated during bedrock weathering takes a higher proportion in the travertine deposition in Huanglong.There are significant differences in the components of particulate matter produced by travertine weathering.The overall trend of heavy metal elements content is Huanglong>Shenshenchi>Kalonggou,and most of the heavy metal elements in the three areas are significantly increased at the mouth of the valley,which may be affected by human activities.In general,the content of heavy metal elements in the three regions is at a low level,only with minor ecological hazard to the environment.The results of PMF model indicate that the heavy metals in travertine may come from atmospheric deposition,geological background source from underground springs and surface runoff.Most of the heavy metal elements in Huanglong travertine are mainly from surface runoff,while Shenshenchi is mainly from the geological background source.The contributions of different sources to most of the heavy metal elements in Kalonggou area travertine are similar.However,the sources of heavy metals in travertine are extremely complex,and more systematic research is needed to clarify their provenance.

关 键 词：钙华 重金属元素 空间分布 源解析 川西北地区 

分 类 号：P579[天文地球—矿物学]