海底浮岩前处理方法的实验研究
发布时间：2018-11-16 20:30
【摘要】：为了解海底浮岩气孔充填物对全岩微量元素组成的影响,并获得有效的海底浮岩前处理方法,对冲绳海槽中部的浮岩碎成大于5 cm,1~2 cm及小于5 mm的碎块分别进行前处理,然后通过扫描电镜(SEM)和X射线衍射光谱(XRD)分析对清洗的效果进行观察对比。结果表明,对大块浮岩直接清洗以及将浮岩碎成厘米级小块后清洗都难以将浮岩气孔内充填的细粒沉积物去除干净,而对浮岩碎成毫米级(5 mm)颗粒后再清洗可以有效清除浮岩气孔内的充填物。本文所确定的一套有效的海底浮岩前处理方法总结如下:(1)将小于5 mm的浮岩颗粒置于超声波清洗机内用蒸馏水清洗,每隔15 min换一次水,直到清洗样品后的水足够清澈;(2)将样品先后浸入无水乙醇和稀盐酸溶液中,分别去除有机质和次生碳酸盐、铁氧化物;(3)将浮岩样品置于40℃超纯水中浸泡7 d左右,并每天换水,直至向上层清液加硝酸银溶液无白色沉淀出现。XRD分析表明,海底浮岩气孔中充填物的矿物组成包括斜长石、石英等。少量的气孔充填物对浮岩全岩的微量元素配分模式影响不大,但会造成Pb、Sr等元素含量的增加,因此可能会对浮岩全岩的Pb-Sr同位素组成造成干扰。
[Abstract]:In order to understand the effect of pore filling on the trace element composition of the whole rock, and to obtain an effective pretreatment method of submarine floatation rock, the fragmentation of the floating rock in the middle of Okinawa trough was pretreated for more than 5 cm,1~2 cm and less than 5 mm, respectively. Then the cleaning effect was observed and compared by scanning electron microscope (SEM) and X-ray diffraction (XRD). The results show that it is difficult to clean the fine sediment filled in the pore of the floatation rock directly and after the floatation rock is broken into centimeters. The filling material in the pore can be effectively removed after the floatation is broken into millimeter (5 mm) particles and then cleaned. A set of effective pre-treatment methods for submarine floatation are summarized as follows: (1) the floatation particles less than 5 mm are washed with distilled water in the ultrasonic cleaning machine, and the water is changed every 15 min until the water is clear enough after cleaning the sample; (2) the samples were immersed in anhydrous ethanol and dilute hydrochloric acid respectively to remove organic matter, secondary carbonate and iron oxide. (3) the floating rock samples were immersed in ultrapure water at 40 鈩，
本文编号：2336565
[Abstract]:In order to understand the effect of pore filling on the trace element composition of the whole rock, and to obtain an effective pretreatment method of submarine floatation rock, the fragmentation of the floating rock in the middle of Okinawa trough was pretreated for more than 5 cm,1~2 cm and less than 5 mm, respectively. Then the cleaning effect was observed and compared by scanning electron microscope (SEM) and X-ray diffraction (XRD). The results show that it is difficult to clean the fine sediment filled in the pore of the floatation rock directly and after the floatation rock is broken into centimeters. The filling material in the pore can be effectively removed after the floatation is broken into millimeter (5 mm) particles and then cleaned. A set of effective pre-treatment methods for submarine floatation are summarized as follows: (1) the floatation particles less than 5 mm are washed with distilled water in the ultrasonic cleaning machine, and the water is changed every 15 min until the water is clear enough after cleaning the sample; (2) the samples were immersed in anhydrous ethanol and dilute hydrochloric acid respectively to remove organic matter, secondary carbonate and iron oxide. (3) the floating rock samples were immersed in ultrapure water at 40 鈩，
本文编号：2336565
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