本文選題：富鈷結(jié)殼 + 鈣質(zhì)超微化石��； 參考：《地學(xué)前緣》2017年01期

【摘要】：富鈷結(jié)殼是發(fā)育在深海海山之上的一種重要沉積礦產(chǎn)資源,建立準(zhǔn)確可靠的年代學(xué)格架,無論對富鈷結(jié)殼成礦作用研究還是對古海洋環(huán)境研究,都具有重要意義。但迄今為止,由于定年技術(shù)的限制,可靠的富鈷結(jié)殼年代學(xué)框架資料并不多。文中以鈣質(zhì)超微化石生物地層學(xué)方法為主要手段,并結(jié)合Co經(jīng)驗(yàn)公式法、樣品的結(jié)構(gòu)特征和磷酸鹽化作用時(shí)代等資料,對麥哲倫海山群MK海山MKD13-3號富鈷結(jié)殼樣品的年代學(xué)框架進(jìn)行了綜合限定。研究結(jié)果如下。(1)該樣品剖面從下到上可以分4層,分別為:磷塊巖基巖,其中包括R層(殘留層)結(jié)殼,時(shí)代為112.0~70.6Ma B.P.;I層,進(jìn)一步劃分為I-1和I-2層,其時(shí)代分別為55.0~48.0Ma B.P.和44.0~23.0Ma B.P.;Ⅱ?qū)?時(shí)代為23.0~14.0Ma B.P.;Ⅲ層,時(shí)代為5.0~0Ma B.P.。(2)該富鈷結(jié)殼樣品在生長過程中發(fā)育了3個生長間斷,分別為:基巖與I-1層之間的生長間斷,時(shí)代為70.6~55.0Ma B.P.;I-1層與I-2層之間的生長間斷,時(shí)代為48.0~44.0Ma B.P.;Ⅱ?qū)优cⅢ層之間的生長間斷,時(shí)代為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，

本文編號：1797279