Reappraisal of hydrocarbon biomarkers in Archean rocks
نویسندگان
چکیده
منابع مشابه
Reappraisal of hydrocarbon biomarkers in Archean rocks.
Hopanes and steranes found in Archean rocks have been presented as key evidence supporting the early rise of oxygenic photosynthesis and eukaryotes, but the syngeneity of these hydrocarbon biomarkers is controversial. To resolve this debate, we performed a multilaboratory study of new cores from the Pilbara Craton, Australia, that were drilled and sampled using unprecedented hydrocarbon-clean p...
متن کاملOrigin and Significance of Archean Quartzose Rocks at Akilia, Greenland
Archean Quartzose Rocks at Akilia, Greenland Fedo and Whitehouse (1) presented data to support their hypothesis that granulite grade quartz magnetite rocks on the island of Akilia, southwest Greenland—which are conformably interposed with pyroxenite and hornblendite units that date from before 3830 million years ago (Ma) (2–4)—had a metasomatic ultramafic igneous origin. They offered that inter...
متن کاملOrigin and significance of Archean quartzose rocks at Akilia, Greenland.
Archean Quartzose Rocks at Akilia, Greenland Fedo and Whitehouse (1) presented data to support their hypothesis that granulite grade quartz magnetite rocks on the island of Akilia, southwest Greenland—which are conformably interposed with pyroxenite and hornblendite units that date from before 3830 million years ago (Ma) (2–4)—had a metasomatic ultramafic igneous origin. They offered that inter...
متن کاملArchean microfossils: a reappraisal of early life on Earth.
The oldest fossils found thus far on Earth are c. 3.49- and 3.46-billion-year-old filamentous and coccoidal microbial remains in rocks of the Pilbara craton, Western Australia, and c. 3.4-billion-year-old rocks from the Barberton region, South Africa. Their biogenicity was recently questioned and they were reinterpreted as contaminants, mineral artefacts or inorganic carbon aggregates. Morpholo...
متن کاملStrain analysis of Archean rocks from the Virginia Horn area, NE Minnesota
The Virginia Horn refers to the structure where the outcrop pattern of the Biwabik Iron Formation makes a sharp bend southward and then back north as a part of a broad, gently plunging anticlinal and synclinal flexure, near the city of Virginia in northeastern Minnesota, exposing supracrustal rocks of Archean age within the core of the anticline. Three deformation events have affected these roc...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 2015
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.1419563112