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晚震旦世 ,中扬子台地北缘碳酸盐岩沉积发育 ,可分为浅水台地和深水台盆 2个相区和 7种不同相带。地球化学分析表明 ,该区地球化学特征与沉积环境有密切的关系 :常量元素Mn在局限海湾相中明显偏高 ,而在其它相带中均较低 ;微量元素B在台缘滩相中含量最低 ,仅 0 .82× 1 0 -6 ,而在其它相带中均大于1× 1 0 -6 ,最高可达 6.56× 1 0 -6 ;微量元素Sr和Sr/Ca× 1 0 3 比值与沉积环境密切相关 ,以浅滩相为中心 ,向局限海湾和深水盆地方向明显增加 ,呈双峰分布。因此 ,利用地球化学标志可以判别沉积相。图 4表 1参 7(邹冬平摘 )
Late Neocene carbonate deposits developed in the northern margin of the Yangtze platform, which can be divided into two facies zones and seven different facies belts in the shallow platform and the deep basin. Geochemical analysis shows that the geochemical characteristics of the area are closely related to the sedimentary environment: the element Mn is obviously higher in the localized Gulf and lower in the other facies; the content of trace element B in the beach margin of the platform margin The lowest was only 0.82 × 10-6, while in other facies belonged to more than 1 × 10-6, up to 6.56 × 10-6. The ratios of Sr and Sr / Ca × 10 3 Sedimentary environment is closely related to the shoal facies as the center, to the limitations of the Gulf and deep-water basins direction significantly increased, showing a bimodal distribution. Therefore, the use of geochemical markers can distinguish sedimentary facies. Figure 4 Table 1 Reference 7 (Zou Dongping pick)