【摘要】 <正> 自本世纪40年代以来,人们采用了酸类处理的方法来溶解碳酸盐岩类型的岩石,使得牙形石分析工作获得了很大的进步。世界古生界大量碳酸盐岩中的牙形石标本便是靠各种酸处理方法获得的。而处理的基本方式是将经过碎样的岩块(大约2公分左右)放入烧杯或塑料桶中浸泡,溶解。我们可以把这种方法称之为浸泡法。采用10%浓度的醋酸来浸泡、溶解碳酸盐岩以求获得牙形石化石的方法在美国古生物学家柯林森(C、Collinson)1963年的一本关于牙形石分析技术的专著中已给予明确的肯定(参见图1)并为全世界的古生物学家广泛采用至今。更多还原

【Abstract】 For several decades,acetic acid or other organic acids have been used to diissolve limestones and other calcareous rocks for the recovery of conod- ont elements and other microfossils.The standard laboratory procedure has involved immersing the rock samples in 10 per cent acetic acid in buckets or beakers,followed by wet sieving and heavy iiquid and/or magnetic concen tration(Collinson,1963).A flow diagram based on that published by Col- linson is shown in Fig.1. In my experience conodont elements retrieved from the buckets are com- monly broken,and the speed of the disaggregation of the rcok is rather slow.In order to increase the rate of the reaction and to minimize damage to the specimens,I have designed and constructed a tower apparatus(Fig.2). The principle is to circulate the acid over the sample and to protect the freed specimens from damage that may be caused as contact with undissolved rock.更多还原