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地质论评  2003 

辽宁北票四合屯地区早白垩世早期鸟类集群死亡原因探析

Keywords: 辽宁北票四合屯地区早白垩世早期鸟类集群死亡火山口元素地球化学鸟化石

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Abstract:

通过大规模系统挖掘,在对四合屯7个含鸟层进行澄清的基础上,以四合屯剖面为主,黄半吉沟剖面为辅,分别在含鸟层的底板、含鸟层、含鸟层顶板,不含鸟沉积层及含鸟层底部的火山岩系统取样,进行多项相关元素分析。应用元素地球化学理论,根据其环境地球化学场特征,结合相关地质资料,重点对鸟类集群死亡原因进行了探讨。结果表明包括二氧化硫(SO2)、硫化氢(H2S)、铅(Pb)的卤化物盐(PbBr2、PbBrCl、Pb(OH)Br、(PbO)2PbBr2)及汞(Hg)蒸汽等有毒气体是导致鸟类集群死亡的主要原因;含鸟化石密集的原因是由于火山口在四合屯附近。

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