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本法系采用土法,从花岗岩或混合岩中分离黑云母以进行同位素年龄测定。操作步骤: (一)样品破碎;在破碎前,首先在镜下确定所需分离的单矿物的粒度,然后进行破碎。本区所做的花岗岩或混合岩中,黑云母矿物的粒度在0.4毫米左右。如大于0.4毫米的常出现连生体现象,所以经实践得出破碎的程度在0.4毫米以下。 (二)粗淘:将破碎后的样品,进行分级,取0.2～0.4毫米级的样品放入盆内,用水冲去粉泥,然后再加上肥皂温水拌匀,静置十多分钟,最后用清水将样品洗净。
This Law uses native method to separate biotite from granite or mixed rock for isotopic age determination. Operation steps: (a) sample crushing; before crushing, first determine the particle size of the single mineral to be separated under the microscope and then crushing. Granite or mixed rocks in this area, biotite mineral particle size of about 0.4 mm. Such as greater than 0.4 mm often appear even in vivo phenomenon, so the degree of practice obtained broken below 0.4 mm. (B) rough Amoy: The crushed samples, grading, take 0.2 ~ 0.4 mm sample into the basin, washed with water and mud, and then add soap and warm water and mix well, let stand for more than 10 minutes, and finally Wash the sample with clean water.