Formation and evolution of the Changbaishan volcanic geothermal system in a convergent plate boundary back-arc region constrained by boron isotope and gas data
Formation and evolution of the Changbaishan volcanic geothermal system in a convergent plate boundary back-arc region constrained by boron isotope and gas data
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硼同位素和气体数据约束的汇聚板块边界弧后区长白山火山地热系统的形成与演化
DOI：
10.1016/j.jhydrol.2018.11.040
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发表时间：
2019-02
影响因子：
6.4
通讯作者：
Pujun Wang
中科院分区：
文献类型：
--
作者：
Rongsheng Zhao;Xuanlong Shan;Chengzhi Wu;Jian Yi Pujun Wang;Guoli Hao;Pujun Wang
本文通过对长白山火山地热系统流体地球化学、硼同位素和天然气数据的分析，重新评价了长白山火山地热系统的形成和演化过程。由于存在热气孔（温度高于100 °C）和烧结物，我们认为地下正在发生相分离，B和气体数据的特征也表明了这一点。根据水化学资料和B/Cl比值，本区热水样品可分为3组：1）蒸汽加热/冷凝水（JJ、JLQ组1-1; SBDG、XRQ组1-2）; 2）岩溶水（CR 3、LSD）; 3）残余水（CR 1、CR2）。利用B和气体数据对样品进行初步判别，结果表明：火山口周围的1-1组受热岩浆物质输入引起的第二相分离过程控制，盆地区的1-2组受粘土矿物转化控制，XRQ水样显示受污水污染;第二组代表溶浸变质岩并被热岩浆挥发物输入直接加热的岩溶水;第三组是一个海水相分离过程的结果。基于硼浓度和同位素质量平衡的混合模型和流体-岩石相互作用模型表明，在长白山地热系统的形成过程中，岩浆挥发分的相分离和输入比流体-岩石相互作用更重要，深部碳酸盐岩储层的第一次相分离过程发生在晚期，约75%~ 87.5%的水变为蒸汽。此外，B同位素的瑞利蒸馏意味着新的岩浆正在该区域下方生成，其气体的低B浓度和高硼同位素值意味着混合组分可能来自俯冲的太平洋板块（例如，海洋沉积物）。由于太平洋板块的持续俯冲而增加的“过剩热量”进一步鼓励了相分离过程，俯冲过程也加速了热液系统向非热液系统的转变。
The goal of this study is to analyze fluid geochemistry, boron isotope and gas data to reassess the formation and evolution processes of the Changbaishan volcanic geothermal system (Jilin, China). Due to the presence of hot fumaroles (with temperatures of higher than 100 °C) and sinters, we believe that phase separation is occurring underground, which is also indicated by the characteristics of the B and gas data. Based on their hydrochemical data and B/Cl ratios, the thermal water samples in this area can be divided into three groups: 1) group 1 is steam-heated/condensate water (group 1-1: JJ, JLQ; group 1-2: SBDG, XRQ); 2) group 2 is karst water (CR3 and LSD); and 3) group 3 is residual water (CR1 and CR2). The preliminary discrimination of samples using B and gas data implies that group 1-1 around the crater is controlled by a second phase separation process, which is induced by the input of hot magmatic material; group 1-2 in the basin area is controlled by the transformation of clay minerals, and the XRQ water sample shows contamination by sewage; group 2 represents karst water that has leached metamorphic rock and been directly heated by the input of hot magmatic volatiles; and group 3 is the result of one seawater phase separation process. The mixing and fluid-rock interaction models based on the mass balance of boron concentration and isotope imply that the phase separation and input of magmatic volatiles are more important than fluid-rock interactions in the formation of the Changbaishan geothermal system, and the first phase separation process in the deep carbonate reservoir occurred in a late stage, with approximately 75%–87.5% of water becoming vapor. Additionally, the Rayleigh distillation of B isotope implies that new magma is being generated below this area, with the low B concentrations and high boron isotopic values of its gases implying that the mixed component may be derived from the subducted Pacific plate (e.g., marine sediment). The addition of “excess heat” due to the continued subduction of the Pacific plate has further encouraged the phase separation process, and the subduction process has also accelerated the transition of the hydrothermal system into a non-hydrothermal system.
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影响因子：
2.4
作者：
J. Varekamp;R. Kreulen;R. Poorter;M. J. Bergen
通讯作者：
J. Varekamp;R. Kreulen;R. Poorter;M. J. Bergen
影响因子：
5
作者：
R. Zeebe
通讯作者：
R. Zeebe
DOI：
10.1016/j.jvolgeores.2015.11.013
发表时间：
2016-01
影响因子：
2.9
作者：
Shein-Fu Wu;C. You;Yen-Po Lin;E. Valsami-Jones;E. Baltatzis
通讯作者：
Shein-Fu Wu;C. You;Yen-Po Lin;E. Valsami-Jones;E. Baltatzis
影响因子：
3.5
作者：
B. Wunder;A. Meixner;R. Romer;R. Wirth;W. Heinrich
通讯作者：
B. Wunder;A. Meixner;R. Romer;R. Wirth;W. Heinrich
影响因子：
3.4
作者：
Wen-jie Zhang;H. Tan;Yanfei Zhang;Hai-Zhen Wei;Tao Dong
通讯作者：
Wen-jie Zhang;H. Tan;Yanfei Zhang;Hai-Zhen Wei;Tao Dong