麦哲伦海山群MK海山富钴结壳钙质超微化石生物地层学研究

发布时间：2018-04-24 15:53

  本文选题：富钴结壳 + 钙质超微化石　； 参考：《地学前缘》2017年01期

【摘要】：富钴结壳是发育在深海海山之上的一种重要沉积矿产资源,建立准确可靠的年代学格架,无论对富钴结壳成矿作用研究还是对古海洋环境研究,都具有重要意义。但迄今为止,由于定年技术的限制,可靠的富钴结壳年代学框架资料并不多。文中以钙质超微化石生物地层学方法为主要手段,并结合Co经验公式法、样品的结构特征和磷酸盐化作用时代等资料,对麦哲伦海山群MK海山MKD13-3号富钴结壳样品的年代学框架进行了综合限定。研究结果如下。(1)该样品剖面从下到上可以分4层,分别为:磷块岩基岩,其中包括R层(残留层)结壳,时代为112.0~70.6Ma B.P.;I层,进一步划分为I-1和I-2层,其时代分别为55.0~48.0Ma B.P.和44.0~23.0Ma B.P.;Ⅱ层,时代为23.0~14.0Ma B.P.;Ⅲ层,时代为5.0~0Ma B.P.。(2)该富钴结壳样品在生长过程中发育了3个生长间断,分别为:基岩与I-1层之间的生长间断,时代为70.6~55.0Ma B.P.;I-1层与I-2层之间的生长间断,时代为48.0~44.0Ma B.P.;Ⅱ层与Ⅲ层之间的生长间断,时代为14.0~5.0Ma B.P.。
[Abstract]:Cobalt-rich crust is an important sedimentary mineral resource developed on deep-sea seamounts. It is of great significance to establish an accurate and reliable chronological framework for the study of cobalt-rich crusts mineralization and paleo-marine environment. But so far, due to the limitations of dating techniques, there are few reliable geochronological frameworks for cobalt-rich crusts. In this paper, the biostratigraphic method of calcareous ultrafossils is used as the main means, and the data of the structural characteristics of the samples and the age of phosphatizing are combined with the empirical formula method of Co. The geochronological framework of the samples of cobalt-rich crusts of MK seamounts in Magellanic seamounts has been comprehensively limited. The results are as follows: (1) the sample profile can be divided into four layers from the bottom to the top. They are: phosphate rock bedrock, including R layer (residual layer) crust, 112.0~70.6Ma B.P.I layer, further divided into I-1 and I-2 layers, whose age is 55.0~48.0Ma B.P. And 44.0~23.0Ma B.P.; 鈪，

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