MINERALOGY AND GEOCHEMISTRY OF THE Co-RICH FERROMANGANESE CRUSTS FROM THE SOUTH WEST INDIAN RIDGE
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摘要: 基于采自西南印度洋超慢速扩张中脊的8块富钴结壳样品,利用XRD、XRF等方法对其进行了矿物学及地球化学组成分析,阐明了该区富钴结壳的矿物物相和元素组成特点,结合主成分分析探讨了该区结壳的成因类型和成矿物质来源。结果表明:该区结壳矿物组成以锰、铁氧化物相为主,其中锰相矿物以水羟锰矿占优势,含少量钡镁锰矿,铁相矿物出现了针铁矿及非晶质-隐晶质相;该区结壳Mn、Fe、Co、Cu、Ni的平均值分别为18.96%、19.71%、0.53%、0.099%、0.47%,它们介于中、西太平洋结壳和大西洋、印度洋结壳的相应的元素含量之间;矿物组成、元素组合、元素比值等皆表明该区结壳属于水成成因,受成岩作用影响微弱,但是未见热液活动的明显影响。Abstract: Eight samples of Co-rich ferromanganese crusts collected from the south west Indian Ridge have been analyzed for their mineralogy and geochemistry by using XRD and XRF methods. Based on the data, the genetic classification and the source of materials are further explored. The mineralogy of the crust suggests that Manganese minerals and Iron minerals are the main components of the crusts. Vernadite is the dominant component of manganese oxide with Todorokite the minor. The most abundant phase of the ferric minerals is X-ray amorphous FeOOH with Goethite identified by a weak X-ray peak. The concentration of Mn, Fe, Co, Cu, and Ni in the crusts ranges between the Pacific Ocean crusts and the Atlantic Ocean crusts or the Indian Ocean crusts, in an average value of 18.96%, 19.71%, 0.53%, 0.099% and 0.47% respectively. The Co-rich ferromanganese crusts are of hydrogenetic origin deduced from mineral composition, element groups and element ratios. The early diagenesis has slight impact on the crusts while the local hydrothermal effect has not been identified.
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Keywords:
- Co-rich ferromanganese crusts /
- mineralogy /
- geochemistry /
- origin /
- south west Indian ridge
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