海底热液系统高温流体的稀土元素组成及其控制因素

doi:10.11867/j.issn.1001-8166.2000.03.0307

地球科学进展 ›› 2000, Vol. 15 ›› Issue (3): 307 -312. doi: 10.11867/j.issn.1001-8166.2000.03.0307

丁振举 ^①②,刘丛强 ^①,姚书振 ^②,周宗桂 ^②

(①中国科学院地球化学研究所,贵州贵阳 550002)
(②中国地质大学资源学院,湖北武汉 430074)

收稿日期:1999-06-21 修回日期:1999-11-11 出版日期:2000-06-01
通讯作者: 丁振举,男,1965年10月出生于山东,博士,从事矿床学、地球化学的科研和教学工作。
基金资助:
国家杰出青年科学家基金项目:“流体—岩石反应体系中稀土元素(和钇)的地球化学”(编号:49625304)和国家“九五”攀登计划预选项
目:“地质流体作用与成矿效应研究”(95-预-39)资助。

RARE EARTH ELEMENTS COMPOSITIONS OF HIGH-TEMPERATURE HYDROTHERMAL FLUIDS IN SEA FLOOR AND CONTROL FACTORS

DING Zhenju ^①②, LIU Congqiang ^①, YAO Shuzhen ^②, ZHOU Zonggui ^②

(①Institute of Geochemistry,Chinese Academy of Sciences,Guiyang550002China)
(②China University of Geosciences,Wuhan 430074,China)

Received:1999-06-21 Revised:1999-11-11 Online:2000-06-01 Published:2000-06-01

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研究稀土元素在流体中的地球化学行为及其控制因素,对利用稀土示踪与流体有关的地球化学过程具有重要意义。海底高温流体稀土组成研究表明,不同背景、岩性热液系统喷口流体的稀土含量差别较大,与海水之间可达几个数量级,但配分模式却非常类似,即普遍具有LREE富集、高的正Eu异常特征。流体的稀土组成与岩石或矿物的蚀变程度、结构构造有关,同时受流体的温压、pH值、Eh值、络合介质种类等因素的影响,其配分模式是流体循环、迁移过程中络合、吸附、矿物沉淀等不同因素共同作用而再次调整的结果。正Eu异常作为高温流体的特征标志,可以用来示踪与高温流体有关的地球化学作用过程,同时Y/Ho比值、负Ce异常可以用来示踪与流体/海水混合有关的化学过程。

关键词: 热液流体, 稀土元素地球化学, 配分模式, 控制因素, 水—岩作用

It is very important to study the behavior and control factors of rare earth elements in fluids for applying them to tracing of the geochemical processes. The REE compositions of the vent fluid show wide contents in concentration but similar on the REE distribution patterns among different seafloor hydrothermal system with various setting and rocks. The distribution patterns common possess high positive Eu anomalies and enriched LREE. The composition of the fluids is related to alteration and texture of rock or mineral and is controlled by environment conditions such as temperature, pressure, pH, Eh,complexing agents. The distribution patterns of high temperature fluids are the results of sorption,complexation, and mineral deposit process and the REE patterns were adjusted and redistributed during fluid circulation and migration. Some REE' s parameters such as Eu, Ce anomalies and Y/Ho ratios can be used to study processes concerning fluid. For example, the positive Eu anomalies, negative Ce anomalies and Y/Ho ratios as mark of involving high-temperature fluid and sea water may be used to trace geochemical processes concerning on mixing.

Key words: Hydrothermal fluid, Geochemistry of the REE, Distribution pattern, Control factor, Water-rock interaction.

中图分类号:

P736.4

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