台湾岛东北部龟山岛附近海域自然硫烟囱体的基本特征研究

龟山岛热液活动区位于冲绳海槽向西延伸的部位，菲律宾海板块向欧亚板块下方俯冲在此隐没，热液活动的出现为研究该地区进一步的发展提供了契机．龟山岛热液活动产生的烟囱体高度富集自然硫，几乎没有其它矿物结晶形成，烟囱体本身呈现分层现象，自然硫的含量也是从烟囱体的外层到内层依次增高，与烟囱体颜色上表观的分层呈现良好的对应关系．我们根据这种分层现象探讨了烟囱体的成因机制和热液流体随时间的变化特征，同时根据等离子质谱（ICP-MS）和X射线衍射仪（XRF）的实验数据分析了自然硫烟囱体存在两种物质来源：热液活动区基底的安山岩和地幔，但是对于地幔物质以何种形式加入到热液流体中还需进一步研究．

Basic characters of native sulfur chimneys near the sea off Kueishantao from the Northeastern Taiwan

Kueishantao hydrothermal activity zone locates in the west extended part of the Okinawa Trough, where Philippine Sea Plate is subducted under the Eurasia Plate. The occurrence of hydrothermal activity gives a chance for exploring the development of the zone. One of the products of Kueishantao island hydrothermal activity are native sulfur chimneys which comprise few minerals, however there are clear layers in the chimney bodies according to the colors. On the other hand thus the native sulfur concentration ascending from outside to inside is coincided with the colored layers. According to the facts as mentioned above, we have discussed the formation of chimneys and the changes about hydrothermal fluid with time. At the same time we have concluded the materials resource on the base of data from ICP-MS and XRF. It suggestes both the andesites of the hydrothermal activity zone and mantle are the materials resources; however, it is not clear how mantle materials contaminate the hydrothermal fluid.