Microfossil recognition in Archean rocks : an appraisal of spheroids and filaments from a 3500 M.Y. old chert-barite unit at North Pole, Western Australia
Microfossil recognition in Archean rocks : an appraisal of spheroids and filaments from a 3500 M.Y. old chert-barite unit at North Pole, Western Australia
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太古代岩石中微化石的识别：对距今 3500 年的球状体和细丝的评估
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发表时间：
1990
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影响因子：
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通讯作者：
R. Buick
中科院分区：
文献类型：
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作者：
R. Buick
除非在特殊情况下，真实的太古代微体化石应该出现在沉积成因的低级岩石的薄片中，由干酪根组成，超过独立存活细胞的最小尺寸，与其他类似形态的微体化石共存，具有中空结构，并显示细胞的精细化。价值较小的是已被提议作为生物源性测试的统计和同位素参数，这些参数往往不能区分生物和非生物组合。一个新发现的六类微体化石。3500百万年利用上述技术对西澳大利亚北极Warrawoona群中古老的硅质岩-重晶石单元进行了评价。尽管它们与丝状和球状原核微生物的现代和化石组合非常相似，但没有一个物体可以证明是生物起源的
Except in exceptional circumstances, real Archean microfossils should occur in thin sections of low-grade rocks of sedimentary origin, consist of kerogen, exceed the minimum size for independently viable cells, co-exist with others of similar morphology, have a hollow structure and display cellular elaboration. Of less value are the statistical and isotopic parameters that have been proposed as biogenicity tests, which often fail to distinguish biological from abiotic assemblages. Six classes of microfossil-like objects from a ca. 3500 m.y. old chert-barite unit in the Warrawoona Group at North Pole, Western Australia, are evaluated using the above techniques. Despite their close resemblances to modern and fossil assemblages of filamentous and coccoid prokaryotic micro-organisms, none of the objects are demonstrably biogenic in origin