东太平洋海隆热液活动及多金属硫化物资源潜力研究进展

发布时间：2018-10-10 09:57

【摘要】：本文综述了中国在东太平洋海隆(East Pacific rise,EPR)及其邻域的热液活动及多金属硫化物资源调查研究工作。近12年来,通过对EPR 13°N和1°~2°S多金属硫化物、Fe-Si-Mn羟基氧化物、热液柱、含金属沉积物和玄武岩进行研究,以及对EPR 13°N附近多金属硫化物资源潜力的初步分析。揭示了多金属硫化物的矿物组成特征及其与元素、同位素组成之间的关系;认识到热液柱颗粒物的快速沉淀导致了EPR 13°N附近Fe-Si-Mn羟基氧化物中REE含量较低和Mn含量偏高;指出了EPR 13°N附近可能存在新的热液活动区,并提出新的热液柱温度异常值计算方法;将EPR 13°N附近玄武岩中斜长石微斑晶和玄武质玻璃边缘的化学蚀变分别划分为5种和4种类型;初步论证EPR 1°~2°S附近的玄武岩是E-MORB和N-MORB两个源区的岩浆以不同比例混合形成的,且区内玄武岩中富集组分有可能来源于Gal錮pagos扩张中心附近的热点源岩浆;提出根据多金属硫化物丘状堆积体或喷口群的形态进行储量估算,给出了EPR 13°N附近多金属硫化物堆积体储量的保守值(2000万t)。在此基础上,进一步明晰了未来在东太平洋海隆进行调查研究的方向及着力点。
[Abstract]:In this paper, the hydrothermal activity and the investigation of polymetallic sulphide resources in the East Pacific Sea uplift (East Pacific rise,EPR) and its neighbors in China are reviewed. In the last 12 years, the EPR 13 掳N and 1 掳2 掳S polymetallic sulphides, Fe-Si-Mn hydroxyl oxides, hydrothermal columns, metal-bearing sediments and basalt were studied, and the potential of polymetallic sulphide resources near EPR 13 掳N. The mineral composition characteristics of polymetallic sulfides and their relationship with elements and isotopic compositions are revealed, and it is recognized that rapid precipitation of hydrothermal column particles leads to lower REE content and higher Mn content in Fe-Si-Mn hydroxyl oxides near EPR 13 掳N. It is pointed out that there may be a new hydrothermal active region near EPR 13 掳N, and a new method for calculating the abnormal temperature of hydrothermal column is proposed. The chemical alteration of plagioclase microporphyry and Black Tortoise glass edge in basalt near EPR 13 掳N is divided into 5 types and 4 types respectively, and it is preliminarily proved that the basalt near EPR 1 掳2 掳S was formed by mixing magma of E-MORB and N-MORB in different proportions. The enrichment components of basalt in the area may be derived from the hot source magma near the Gal imprison pagos spreading center, and the reserves are estimated according to the morphology of polymetallic sulphide mound accumulations or vent groups. The conservative value (20 million t).) of the reserves of polymetallic sulphide deposits near EPR 13 掳N is given. On this basis, the direction and focus of future investigation and research in the East Pacific seamounts are further clarified.
【作者单位】：中国科学院海洋研究所;
【基金】：国家大洋重大专项课题(DY125-12-R-02) 国家重点基础研究发展计划项目(2013CB429700) 国家自然科学基金项目(40830849,41325021) 山东省自然科学杰出青年基金项目(JQ200913)
【分类号】：P736.1;P744

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