EPR 9&#176;～10&#176;N L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

姚会强; 周怀阳; 彭晓彤; 周新茂; 董从芳; 吴自军; 李江涛

EPR 9°～10°N L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

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

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

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出版历程
- 收稿日期: 2009-02-22
- 修回日期: 2009-04-28

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

1.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640 China;State Key Laboratory of Marine Geology, Marine School, Tongji University, Shanghai 200092 China;Graduate School, Chinese Academy of Sciences, Beijing 100049, China
2.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640 China;State Key Laboratory of Marine Geology, Marine School, Tongji University, Shanghai 200092 China
3.
Research Institute of Petroleum Exploration & Oevelopment, Beijing 100083, China

摘要

摘要: 为了重建EPR 9°~10°N L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EPR 9°~10°N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℃。
- EPR9° /
- ~10° /
- N /
- L喷口 /
- 黑烟囱体 /
- 热液系统 /
- 方黄铜矿 /
- 年龄
Abstract: For restructuring the formation conditions of the black smoker chimney from L vent EPR 9°~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℃.
- EPR 9° /
- ~10° /
- N /
- L vent:black smoker chimney /
- hydrothermal system /
- cubanite /
- lead-210 age /

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