Earth's biogeochemical cycle of carbon delivers both limestones and organic materials to
the crust. In numerous, biologically catalysed redox reactions, hydrogen, sulphur, iron, and …

Hydrothermal systems have prevailed throughout geological history on earth, and ancient
Archaean hydrothermal deposits could provide clues to understanding earth's earliest …

The low O2 content of the Archean atmosphere implies that methane should have been
present at levels∼ 102 to 103 parts per million volume (ppmv)(compared with 1.7 ppmv …

The Palaeoproterozoic positive excursion of δ 13C carb is now considered as three positive
shifts of δ 13C carb separated by returns to 0‰, which all occurred between 2.40 and 2.06 …

Large carbon isotope fluctuations have been systematically reported for Ediacaran
carbonate rocks, the meaning of which remains controversial. In order to better understand …

Abstract The Palaeoproterozoic Lomagundi–Jatuli Event is one of the largest magnitude and
earliest known positive carbonate carbon isotope excursions, preserving δ 13 C values …

The ca. 2.42 Ga-old Gandarela Formation overlies the finely laminated Cauê Banded Iron
Formation (BIF) of the Itabira Group, Minas Supergroup, Brazil and consists of red carbonate …

Early diagenesis of marine organic matter dramatically impacts Earth's surface chemistry by
changing the burial potential of carbon and promoting the formation of authigenic mineral …

Authigenic carbonate (AC) forms in siliciclastic marine sediments in part as a result of the
degradation of organic matter and methane. Degradation pathways vary considerably and …

Positive carbon isotope excursion is reported from Paleoproterozoic carbonates of the
Aravalli Supergroup (northwestern India), the Minas Supergroup (Brazil), and new sections …