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洪辉亮 《海洋学报(英文版)》1986,5(4):552-562
No Jess than 90 species of detrital minerals have been identified from the fine and very fine sand grains in the sediments from the Western Central Pacific. It is demonstrated that the volcanic minerals were originated from the eruption of oceanic tholeiitic magma since the Early Pleistocene according to the mineralogical indications and the rare-earth element distribution pattern. The mineral assemblage indicates that the detrital minerals are principally of pelagic origin. But the Melanesia Basin has more terrigenous constituents of minerals, of which, the quartz content increased generally during the interglacial periods. The area of Wallis Islands, especially of the Northern Fiji Basin has relatively typical pelagic substances and less terrigenous components. The genesis of the authigenic manganese nodules is closely related to the brown clay and can also be found in the calcium carbonate sediments in form of fine grain, but not in the relatively loose calciferous volcanic ash bed in the Northern Fi 相似文献
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本文详细地分析了九龙江口SD0 3岩心中自生矿物的成因 ,推断河口区在约1 0ka ,B .P .中历经了河流沉积、湖泊沉积和河口海湾沉积三种沉积环境 .在沉积环境演化过程中共形成了 1 0种重矿物组合 . 相似文献
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中太平洋西部沉积物细砂-极细砂中的碎屑矿物不下90种,根据矿物学标志和稀土配分模式论证了火山矿物主要源于早更新世及其后大洋拉斑玄武岩浆的喷发,矿物组合特征表明,矿物碎屑主要是远洋成因,但美拉尼西亚海盆中的陆源成分较多,其中石英含量在间冰期中普遍增加,瓦利斯群岛近区尤其是北斐济海盆则赋存较典型的远洋物质,陆源成分较少,自生锰结核的形成同褐色粘土关系密切,在碳酸钙沉积物中也能见到,但主要形成显微颗粒,而在北斐济海盆较松散的含钙质火山灰层中尚未发现. 相似文献
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本文详细地分析了九龙江口SD03岩心中自生矿物的成因，推断河口区在约10ka,B.P.中历经了河流沉积、湖泊沉积和河口海湾沉积三种沉积环境。在沉积环境演化过程中共形成了10种重矿物组合。 相似文献
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硅灰石作用为一种新型工业材料,已得到广泛应用。地壳中硅质和钙质的矿物资源极其丰富,为弥补天然硅灰石矿产的不足,欧美及日本等发达国家部很重视合成硅灰石的研究与生产,并已投入了工业性生产。 相似文献
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