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化石混杂是混杂堆积中所特有的地质现象.在国内外已知的混杂堆积中都不乏其例,如美国著名的加利福尼亚弗兰西斯科混杂堆积,土耳其东托罗斯山脉的构造混杂堆积,我国台湾的利吉层混杂堆积,川西南乡城—德荣一带的混杂堆积以及雅鲁藏布江地缝合线的混杂堆积等都有化石混杂现象.西秦岭混杂堆积也不例外,尤其是甘南地区更为突出,研究化石混杂现象可以确定混杂堆积中外来岩块的时代、其原始沉积环境和可能的来源区;对混杂堆积基质中化石时代及生态特征的研究,可以确定混杂堆积生成的时代和古沉积环境特征.从而为混杂堆积的成因和古板块活动方式提供有力的佐证.本文试图通过西秦岭混杂堆积中化石混杂现象的剖析,对上述有关问题作初步探讨.
Fossil mixed is a unique geological phenomenon in mixed accumulation.It has many examples in the known mixed accumulation at home and abroad, such as the mixed accumulation of the famous California Francisco, the structure of the East Toros Mountains in Turkey, There are fossil miscellaneous depositions in Taiwan, such as the Lijiling mixed deposits, the mixed deposits in the southwestern city of Sichuan - De Rong, and the mixed deposits of the Yarlung Zangbo suture, etc. The mixed deposition of the West Qinling is no exception, especially in southern Gansu Province. The mixed fossil phenomenon can determine the epoch, the original sedimentary environment and the possible source region of the alluvial rock in the mixed accumulation. The study of the fossil epoch and the ecological characteristics in the mixed sedimentary base can confirm the age of the mixed accumulation and the characteristics of the paleo-sedimentary environment. So as to provide evidence for the causes of the mixed accumulation and the activities of the ancient plate.This paper attempts to analyze the above-mentioned problems through the analysis of mixed fossils in the West Qinling mixed deposition.