EPR9°～10°NL喷口黑烟囱体形成环境重建：来自矿物学及铅-210年龄的限制  

Restructuring the formation conditions of black smoker chimney from L vent EPR 9°～10°N: constraints from mineralogy and lead-210 age

作　　者：姚会强[1,2,3] 周怀阳[1,2] 彭晓彤[1,2] 周新茂[4] 董从芳[1,2] 吴自军[1,2] 李江涛[1,2] 

机构地区：[1]中国科学院广州地球化学研究所,广东广州510640 [2]同济大学海洋学院海洋地质国家重点实验室,上海200092 [3]中国科学院研究生院,北京100049 [4]中国石油勘探开发研究院,北京100083

出　　处：《海洋学报》2009年第5期48-57,共10页

基　　金：国家自然科学基金重点项目(40532011);国家自然科学基金(40403004;40473032)

摘　　要：为了重建EPR9°～10°NL喷口的形成环境，采用矿物学、地球化学及年代学的方法，对黑烟囱体的矿物组成、矿物结构、元素剖面分布以及黑烟囱体内外层铅-210测年进行了研究。矿物学观察表明，该喷口烟囱体内壁主要由方黄铜矿组成，而外壁则主要由硬石膏组成。铅-210测年结果表明，烟囱体形成于EPR9°～10°NL区域内1991年的火山喷发事件之后，并有较低的生长速率，约为0．3cm／a。结合该喷口及其附近A喷口已发表资料认为，该烟囱体开始生长是由于蒸气相流体引起的，其后期受到卤水相流体的影响，而且流体温度应不小于330℃。For restructuring the formation conditions of the black smoker chimney from L vent EPR9°～10°N, mineralogy, the distribution of elements, and the ages of this chimney were studied with mineralogical, geochemical and radioactive chronological methods. Mineral observations show that the inner wall of this chimney is composed of cubanite, and the outer wall of the chimney is mainly composed of anhydrite. The results of lead-210 age show that the chimney forms after the 1991 EPR volcanic eruption events and has a slower growth rate, about 0.3 cm/a. Combining these results with the published data about A vent, nearby L vent, it is suggested that this chimney begins growth with a vapor phase fluid, and later is influenced by a brine phase fluid with temperature not less than 330 ℃.

关 键 词：EPR9°~10°NL喷口 黑烟囱体 热液系统 方黄铜矿 年龄 

分 类 号：P736.2[天文地球—海洋地质] P736.3[天文地球—海洋科学]