Archean

Just out | Earliest signs of life on land preserved in ca. 3.5 Ga hot spring deposits @ Nature Communications

Just out @ Nature Communications Earliest signs of life on land preserved in ca. 3.5 Ga hot spring deposits Author(s) Tara Djokic, Martin J. Van Kranendonk, Kathleen A. Campbell, Malcolm R. Walter & Colin R. Ward Abstract: The ca. 3.48 Ga Dresser Formation, Pilbara Craton, Western Australia, is well known for hosting some of Earth’s earliest convincing evidence of life (stromatolites, fractionated sulfur/carbon isotopes, microfossils) within a dynamic, low-eruptive volcanic caldera

On the News | Oldest land-based fossils ever discovered suggest Charles Darwin was right about the origin of life @ Independent

On the News @ Independent Title:  Oldest land-based fossils ever discovered suggest Charles Darwin was right about the origin of life Excerpt: “Life on Earth could have begun on land, not in the sea, according to scientists who discovered a 3.48 billion-year-old fossil. The fossilised bubbles and layered rock are evidence of microbes that would be the oldest known life-forms on land – beating the previous record holder by 580 million years.

Just out | Rise of Earth’s atmospheric oxygen controlled by efficient subduction of organic carbon @ Nature Geoscience

Just out @ Nature Geoscience Rise of Earth’s atmospheric oxygen controlled by efficient subduction of organic carbon Author(s) Megan S. Duncan & Rajdeep Dasgupta Abstract: The net flux of carbon between the Earth’s interior and exterior, which is critical for redox evolution and planetary habitability, relies heavily on the extent of carbon subduction. While the fate of carbonates during subduction has been studied, little is known about how organic carbon is

Just out | Reconstructed ancestral enzymes suggest long-term cooling of Earth’s photic zone since the Archean @ PNAS

Just out @ PNAS Reconstructed ancestral enzymes suggest long-term cooling of Earth’s photic zone since the Archean Author(s) Amanda K. Garcia, J. William Schopf, Shin-ichi Yokobori, Satoshi Akanuma, and Akihiko Yamagishi Abstract: Paleotemperatures inferred from the isotopic compositions (δ18O and δ30Si) of marine cherts suggest that Earth’s oceans cooled from 70 ± 15 °C in the Archean to the present ∼15 °C. This interpretation, however, has been subject to question