中国岩溶
中國巖溶
중국암용
CARSOLOGICA SINICA
2015年
3期
201-208
,共8页
王尊波%沈立成%梁作兵%江泽利%廖昱
王尊波%瀋立成%樑作兵%江澤利%廖昱
왕존파%침립성%량작병%강택리%료욱
地热区%水化学%风化%碳同位素%搭格架%西藏
地熱區%水化學%風化%碳同位素%搭格架%西藏
지열구%수화학%풍화%탄동위소%탑격가%서장
geothermal field%hydrochemistry%weathering%carbon isotope%Daggyia%Tibet
为探究青藏高原搭格架地热区地热水、湖水、河水、冰雪融水等天然水体的水化学组成及物质来源控制因子,于2014年8月对该地区进行了考察和取样。利用紫外-可见光分光光度计和 ICP-OES 测定了水样中各阴、阳离子含量,利用 Gas Bench 连接同位素质谱仪测定了水样中溶解无机碳(DIC)同位素比值。结果表明,地热水中总溶解固体(TDS)含量为977.13~1279.50 mg/L,阳离子以 K+和 Na+为主,阴离子以HCO 3-和 Cl-为主,湖水的 TDS 含量为77.81~810.94 mg/L,阳离子以 Na+和 Ca2+为主,阴离子以 HCO 3-(CO 32-)和 SO 42-为主,地热水和湖水的水化学类型为 HCO 3-Na 型；河水和冰雪融水的各离子含量较低,水化学类型为 HCO 3- Ca 型；地热水的 DIC 浓度范围为9.2~15.4 mmol/L,δ13 CDIC 值为-9.09‰~-0.95‰；湖水的 DIC 浓度为1.1~9.7 mmol/L,δ13 CDIC 值为-8.84‰~-0.27‰。根据水化学 Gibbs 分布模式图判断出区域水化学特征主要受硅酸盐岩风化控制,以钠长石和钾长石风化为主,但是地热水的水化学组分受到硅酸盐岩和蒸发盐岩共同控制。通过碳同位素比值分析对区域主要风化过程中 CO 2的来源示踪表明,湖区周围的硅酸盐风化其碳源主要为土壤 CO 2,热泉区硅酸盐水解其碳源为地球深部 CO 2输入。
為探究青藏高原搭格架地熱區地熱水、湖水、河水、冰雪融水等天然水體的水化學組成及物質來源控製因子,于2014年8月對該地區進行瞭攷察和取樣。利用紫外-可見光分光光度計和 ICP-OES 測定瞭水樣中各陰、暘離子含量,利用 Gas Bench 連接同位素質譜儀測定瞭水樣中溶解無機碳(DIC)同位素比值。結果錶明,地熱水中總溶解固體(TDS)含量為977.13~1279.50 mg/L,暘離子以 K+和 Na+為主,陰離子以HCO 3-和 Cl-為主,湖水的 TDS 含量為77.81~810.94 mg/L,暘離子以 Na+和 Ca2+為主,陰離子以 HCO 3-(CO 32-)和 SO 42-為主,地熱水和湖水的水化學類型為 HCO 3-Na 型；河水和冰雪融水的各離子含量較低,水化學類型為 HCO 3- Ca 型；地熱水的 DIC 濃度範圍為9.2~15.4 mmol/L,δ13 CDIC 值為-9.09‰~-0.95‰；湖水的 DIC 濃度為1.1~9.7 mmol/L,δ13 CDIC 值為-8.84‰~-0.27‰。根據水化學 Gibbs 分佈模式圖判斷齣區域水化學特徵主要受硅痠鹽巖風化控製,以鈉長石和鉀長石風化為主,但是地熱水的水化學組分受到硅痠鹽巖和蒸髮鹽巖共同控製。通過碳同位素比值分析對區域主要風化過程中 CO 2的來源示蹤錶明,湖區週圍的硅痠鹽風化其碳源主要為土壤 CO 2,熱泉區硅痠鹽水解其碳源為地毬深部 CO 2輸入。
위탐구청장고원탑격가지열구지열수、호수、하수、빙설융수등천연수체적수화학조성급물질래원공제인자,우2014년8월대해지구진행료고찰화취양。이용자외-가견광분광광도계화 ICP-OES 측정료수양중각음、양리자함량,이용 Gas Bench 련접동위소질보의측정료수양중용해무궤탄(DIC)동위소비치。결과표명,지열수중총용해고체(TDS)함량위977.13~1279.50 mg/L,양리자이 K+화 Na+위주,음리자이HCO 3-화 Cl-위주,호수적 TDS 함량위77.81~810.94 mg/L,양리자이 Na+화 Ca2+위주,음리자이 HCO 3-(CO 32-)화 SO 42-위주,지열수화호수적수화학류형위 HCO 3-Na 형；하수화빙설융수적각리자함량교저,수화학류형위 HCO 3- Ca 형；지열수적 DIC 농도범위위9.2~15.4 mmol/L,δ13 CDIC 치위-9.09‰~-0.95‰；호수적 DIC 농도위1.1~9.7 mmol/L,δ13 CDIC 치위-8.84‰~-0.27‰。근거수화학 Gibbs 분포모식도판단출구역수화학특정주요수규산염암풍화공제,이납장석화갑장석풍화위주,단시지열수적수화학조분수도규산염암화증발염암공동공제。통과탄동위소비치분석대구역주요풍화과정중 CO 2적래원시종표명,호구주위적규산염풍화기탄원주요위토양 CO 2,열천구규산염수해기탄원위지구심부 CO 2수입。
The objective of this work is to investigate the hydrochemical compositions of the geothermal wa-ter,lake water,river water,and ice-and snow-melt water as well as control factors of provenance in the Daggyia geothermal field of Tibet.The field surveys and sampling were conducted in August 2014.The main cations and anions of samples were measured using the ICP-OES and UV-visible spectrophotometer.The iso-topic ratios of dissolved inorganic carbon (DIC)were analyzed using a gas stable isotope ratio mass spectrom-eter.The results show that the concentrations of total dissolved solids (TDS)range from 977.13 mg/L to 1 279.50 mg/L for geothermal water,and K+ and Na+ are the main cations,and HCO 3 - and Cl- are the main anions.The concentrations of TDS of the lake waters range from 77.81 mg/L to 810.94 mg/L,Ca2 + ,Na+ , HCO 3 - (CO 3 2 - )and SO 4 2 - occupy the majority of ions.The hydrochemical types of both geothermal water and lake water are the type of bicarbonate-sodium.The ion concentrations of river and melt water are low, and the hydrochemical type is bicarbonate-calcium.The concentrations of DIC in geothermal water range from 9.2 mmol/L to 15.4 mmol/L,and that of δ1 3 CDIC ranges from -9.09‰ to -0.95‰.The concentra-tions of DIC in lake water are 1.1 mmol/L to 9.7 mmol/L,theδ1 3 CDIC values are -8.84‰ to -0.27‰.The Gibbs boomerang envelope of water samples indicates that the hydrochemical characteristics are mainly con-trolled by silicate rocks weathering in the area,and the major processes are the albite and potash feldspar weathering,while the hydrochemical compositions of geothermal water are also affected by dissolution of e-vaporation of salt rocks.The carbon sources of silicate weathering around the lakes are mainly soil carbon di-oxide.Meanwhile the deep carbon dioxide input is the main source of silicate hydrolysis in hot spring areas.
