Biogenicity of morphologically diverse carbonaceous microstructures from the ca. 3400 Ma Strelley pool formation, in the Pilbara Craton, Western Australia.
Biogenicity of morphologically diverse carbonaceous microstructures from the ca. 3400 Ma Strelley pool formation, in the Pilbara Craton, Western Australia.
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DOI：
10.1089/ast.2010.0513
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发表时间：
2010-12
期刊：
影响因子：
4.2
通讯作者：
K. Sugitani;K. Lepot;T. Nagaoka;K. Mimura;M. V. Van Kranendonk;D. Oehler;M. Walter
中科院分区：
文献类型：
--
作者：
K. Sugitani;K. Lepot;T. Nagaoka;K. Mimura;M. V. Van Kranendonk;D. Oehler;M. Walter
形态多样的结构，可能构成有机微体化石的报告，从三个遥远的和广泛分离的地点分配给ca。3400 Ma Strelley Pool Formation in the Pilbara Pillon，Western Australia.这些地方包括全景，Warralong和Goldsworthy绿岩带。在帕诺拉马绿岩带中，发现了大型（> 40 μm）透镜状到纺锤状构造、球状构造和席状线状构造，在瓦拉隆和戈尔兹沃西绿岩带中也发现了类似的碳质构造组合，但这些组合缺少线状构造，而含有膜状构造。所有构造都与其宿主沉积黑色燧石同生，后者与叠层石和蒸发岩有关。寄主硅质岩被认为是在浅水环境中沉积的。对生物源性的严格评估（考虑成分、大小范围、丰度、埋藏特征和空间分布）表明，成簇的小（15 μm）球状体和简单的膜状结构不太确定。虽然需要进一步的调查，以确认生物成因的碳质结构从Strelley池形成，这项研究提供了证据，存在形态复杂的大型微体化石在3400马的皮尔巴拉盆地，这可以与同期的，可能的微体化石报告从南非。尽管还有很多东西需要学习，但它们应该为我们提供关于生命早期进化和浅水生态系统的新见解。
Morphologically diverse structures that may constitute organic microfossils are reported from three remote and widely separated localities assigned to the ca. 3400 Ma Strelley Pool Formation in the Pilbara Craton, Western Australia. These localities include the Panorama, Warralong, and Goldsworthy greenstone belts. From the Panorama greenstone belt, large (> 40 μm) lenticular to spindle-like structures, spheroidal structures, and mat-forming thread-like structures are found. Similar assemblages of carbonaceous structures have been identified from the Warralong and Goldsworthy greenstone belts, though these assemblages lack the thread-like structures but contain film-like structures. All structures are syngenetic with their host sedimentary black chert, which is associated with stromatolites and evaporites. The host chert is considered to have been deposited in a shallow water environment. Rigorous assessment of biogenicity (considering composition, size range, abundance, taphonomic features, and spatial distributions) suggests that cluster-forming small (15 μm) spheroids and simple film-like structures is less certain. Although further investigations are required to confirm the biogenicity of carbonaceous structures from the Strelley Pool Formation, this study presents evidence for the existence of morphologically complex and large microfossils at 3400 Ma in the Pilbara Craton, which can be correlated to the contemporaneous, possible microfossils reported from South Africa. Although there is still much to be learned, they should provide us with new insights into the early evolution of life and shallow water ecosystems.