Geochemistry of gases in spring waters along the Alpine Fault, South Island of New Zealand

新西兰南岛的阿尔卑斯断裂带是一个主要特征，虽然历史上没有发生过大地震，但其向北移动速度为27mm /年，隆升速度很快。在ICDP高山断层科学钻探项目的背景下，我们建议对断层两侧泉水中散发的气体成分进行区域调查。这项研究的目的是确定地幔和地壳的气源特征，并揭示可能改变气体成分的过程。特别是，我们计划分别在阿尔卑斯断层的西北和东南两侧探索是否存在系统的成分差异。为此，我们将测定游离或溶解弹簧气体中主要和微量气体成分（CO2、N2、CH4、Ar、He等）的丰度，以及稀有气体（He、Ne、Ar、Kr、Xe）的元素和同位素组成。我们的数据将作为钻井过程中获得的结果比较的基础。

The Alpine Fault on the South Island of New Zealand is a major feature, showing a NE movement of 27 mm/yr and rapid uplift although no major earthquakes have occurred in historic time. In the context of the ICDP project for scientific drilling into the Alpine Fault, we propose a regional investigation of the composition of gases emanating from spring waters on both sides of the fault. The study aims at characterizing the gas sources in both the mantle and the crust and at revealing the processes that may have modified the gas compositions. In particular, we plan to explore whether there are any systematic compositional differences on the northwest and southeast sides of the Alpine Fault, respectively. To do this, we will determine the abundances of major and trace gas components (CO2, N2, CH4, Ar, He etc.) and the elemental and isotopic compositions of the noble gases (He, Ne, Ar, Kr, Xe) in free or dissolved spring gases. Our data will serve as a basis of comparison for results obtained during drilling.