假史塔夫(虫筳)与小泽(虫筳)中铝元素的富集现象:对贵州与内蒙古(虫筳)类化石的电子探针面分析实验

Aluminum enrichment in Pseudostaffella and Ozawainella:electron microprobe mapping experiments on fossil fusulinids from Guizhou and Inner Mongolia

对产自内蒙古阿木乌苏剖面和贵州省路马寨剖面的(虫筳)类化石进行电子探针面分析实验,发现铝元素在部分样品上存在富集现象且表现出一定的规律性。高铝点通常沿着(虫筳)类化石的壳圈分布,而且仅出现在Pseudostaffella和Ozawainella属上。但这两属化石上的铝元素富集现象并非完全一致:在Pseudostaffella上,铝元素仅在最外圈上出现富集。在Ozawainella上,各个壳圈上均有富集现象。考虑到(虫筳)类壳形与其活动方式的相关性,并结合海洋环境中铝元素的分布特征,此类铝元素富集现象很可能是由Pseudostaffella与Ozawainella本身偏漂浮的活动方式引起的。

Based on elements mapping experiments by EPMA( Electron Probe Microanalysis) of fossil fusulinids from Amuwusu section in Inner Mongolia and Lumazhai section in Guizhou,enrichment of Al can be observed on some EPMA images and appears to be regular. The bright spot( high Al level) occurs along the spirotheca of fossils and appear only in Pseudostaffella and Ozawainella. However,the Al enrichment phenomena of these fossils are not completely consistent: in genus Pseudostaffella,Al is only enriched on the last volution,while in Ozawainella,enrichment occurs on each volution. Considering the relationship between shell shape and movement mode of fusulinids,and combining with the distribution characteristics of Al in the marine environment,it is suggested that the Al enrichment may be caused by the floating behavior of Pseudostaffella and Ozawainella.