Direct dating of Archean microbial ichnofossils
作者： Neil R. Banerjee , Antonio Simonetti , Harald Furnes , Karlis Muehlenbachs , Hubert Staudigel
DOI: 10.1130/G23534A.1
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摘要: Well-preserved Archean pillow lavas from the ca. 3.35 Ga Euro Basalt of Pilbara Craton, Western Australia, contain micron-sized tubular structures mineralized by titanite (CaTiSiO 4 ) with residual organic carbon preserved along their margins. Direct U-Pb dating in demonstrates an age. These microstruc- tures are identical to microbial ichnofossils modern basalts, ophiolites, and greenstone belts, interpreted as a biogenic signature these ancient rocks. Microbial colonization basaltic glass thus appears have been part deep subsurface biosphere established early Earth's history.
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