| 太平洋锰结核生长速率的初步研究 |
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| 引用本文： | 钱江初,徐征宇.太平洋锰结核生长速率的初步研究[J].沉积学报,1990,8(1):122-128. |
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| 作者姓名： | 钱江初 徐征宇 |
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| 作者单位： | 国家海洋局第二海洋研究所 |
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| 摘 要： | 本文介绍了用轴系年代法中230Th(过剩)和230Th(过剩)/232Th方法对取自太平洋海底的三个锰结核的生长速率及在海底的运动情况进行了研究。根据锰结核顶面和底面的230Th(过剩)及210Th(过剩)232Th的剖面,得出了三个锰结核的生长速率在1-10mm/M·Yr左右。另根据结核顶、底两面中230Th(过剩)及210Pb放射性印度的差异,可推算出锰结核在海底的翻滚周期在150
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| 关 键 词： | 锰结核 铀系测年 生长速率 翻滚周期 放射性比度 |
RESEARCH ON GROWTH RATES OF MANGANESE NODULES FROM NORTH PACIFIC |
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| Institution: | Second Institute of Oceanography, State Oceanic Administration |
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| Abstract: | Many research items on the manganese nodules from ocean bottom have been earned ouu but the growth rales of manganese nodules as well as their movements on the ocean bottom still puzzles the scientists. Various methods have bee created to answer these question. The trustworthy and acceptable methods are -230Th excess; -230Th / -232Th; -231Pa; K / Ar and -10Be. Three manganese nodules have been analysed using -230Th excess and -230Th / -232Th methods in order to detect their growth rates. The procedures are as follows: Successive layers of specimens from top side and bottom side arc scraped; acid leaching; separation and purification of U and Th using Dowcsi-8 resin; TTA extraction and a counting. The growth rates of three nodules using two different methods a;e agreeable, ranging l-10mm / M.Yr. The last turnover of the noduics can be evaluated from the different activities of -230Th at the surface of top and bottom sides. The results range from 5 ×104to 2.5 × 105ycars, thereat -210Pb profiles indicates that the turnover of the noduics didn ' t take place in the last 150 years. |
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