寒武纪早期微体化石上的异质体拖曳迹与微型钻孔结构

发布时间：2018-06-08 22:05

  本文选题：AITs + 钻孔微生物　； 参考：《科学通报》2017年35期

【摘要】：陕南西乡张家沟剖面的寒武纪宽川铺组中产出的磷酸盐化微体化石上大量保存了一种微型管道结构,被解释为异质体拖曳迹(ambient inclusion trails,AITs).同时报道并讨论了与化石相关的3种AITs新现象:(1)AITs及与其共生的钻孔蓝细菌和钻孔真菌化石.通过直接对比揭示了三者在形态和保存模式上的不同,进一步澄清了区分类似结构的生物成因和非生物成因的标准.(2)罕见的有机碳质的AITs末端推进颗粒.常见的AITs一般是由黄铁矿颗粒的运移造成,碳质末端颗粒的发现可以进一步丰富AITs成因和形态多样化的解释,还得以通过碳质物的拉曼光谱地质温度计,推测出化石群埋藏后经过了极低变质作用.(3)AITs在原牙形类化石上呈环绕分布.根据AITs的形成机制对这一现象进行分析探讨,从侧面佐证了原牙形类化石刺体的原始成分为有机质,并且在成岩过程中经历次生磷酸盐化的观点.
[Abstract]:A large number of Phosphate microfossils from the Cambrian Kuanchuan formation in Zhangjiagou section, Xixiang, southern Shaanxi Province, have preserved a large number of microtubing structures, which are interpreted as the heterogeneous inclusion trails of AITs. At the same time, three new phenomena of AITs related to fossils are reported and discussed. They are the cyanobacteria and the fossils of borehole fungi associated with AITs. By direct comparison, the differences in morphology and conservation patterns among the three are revealed, further clarifying the rare AITs terminal propelling particles of organic carbon, which are the criteria for distinguishing biogenic and abiogenic organisms with similar structures. The common AITs are generally caused by the migration of pyrite particles. The discovery of carbon terminal particles can further enrich the explanation of the origin and morphology of AITs. It is inferred that the metamorphism of the metamorphism is very low after burial. The AITs of the metamorphism are surrounded by the protoodontic fossils. According to the formation mechanism of AITs, this phenomenon is analyzed and discussed, which proves the viewpoint that the original composition of the proodontoid fossil spines is organic matter and experienced secondary phosphate during diagenesis.
【作者单位】： 西北大学地质学系大陆动力学国家重点实验室陕西省早期生命与环境重点实验室;
【基金】：国家自然科学基金(41772010,41621003,41720104002) 现代古生物学和地层学国家重点实验室基金(163107) 教育部高等学校学科创新引智计划(D17013)资助
【分类号】：P534.41;Q911.2
，

本文编号：1997347