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通过对3块中太平洋铁锰结壳样品进行的生物地层学及其结构构造、元素地球化学剖面的综合研究发现,铁锰结壳的生长主要集中于两个形成环境存在差异分别由不同因素控制的形成阶段,一个是约25Ma以来其形成环境氧化程度由南极底层流(AABW)控制的对应于结壳新壳层的生长幕,另一个是渐新世之前其形成环境氧化程度由环赤道表中层洋流和高密度温盐表层水下沉控制的对应于结壳老壳层的生长幕,而在早、中渐新世处于两种环境的转换期,也正好是海退期、大洋低生产力期、低CCD和生物碳酸盐低产率期,形成结壳生长的主要生长间断。该研究成果对于进一步了解太平洋的古海洋、古环境演变有一定意义。
Based on the bio-stratigraphy and structural structure of three samples of ferromanganese crusts from the Central Pacific Ocean, a comprehensive study on the elemental geochemical profiles shows that the growth of ferromanganese crusts mainly concentrates on the difference between the two forming environments and is controlled by different factors One is the formation of a new curtain layer corresponding to the new crust of the crust, controlled by the AABW, with a degree of environmental oxidation of about 25 Ma, and the other is the formation of the environment before the Oligocene, the degree of oxidation by the Central Equatorial Table The mid-ocean current and high-temperature thermohaline surface water subsidence control corresponds to the growth crust of the crust, whereas in the early and middle Oligocene, it is in the transitional period between the two environments, which is exactly the regression of the sea and the low ocean productivity Period, low CCD and low yield of biocarbons, the formation of the main growth of crusts intermittent. The research results have certain significance for further understanding of the paleoceanographic evolution in the Pacific Ocean.