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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。
According to the mineralogical sign and RE pattern, the volcanic minerals are mainly derived from the eruption of the Early Pleistocene and the later oceanic basalt magma, The assemblage shows that the mineral clastic is mainly of oceanic origin, but there are many terrestrial components in the Melanesian basin. Quartz content generally increases during the interglacial period. The Wallis area, especially the North Fiji basin, The typical oceanic material has less terrigenous components, and the formation of spontaneous manganese nodules is closely related to brown clay, as can also be seen in calcium carbonate sediments but mainly in the form of microscopic particles, whereas in the North Fiji basin loose calcareous calcareous Volcanic ash layer has not yet been found.