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New marine sulfur cycle model after the Snowball Earth glaciation

Researchers propose novel sulfur cycle model incorporating volatile organosulfur compounds to explain global occurrence of superheavy pyrite. The Cryogenian interglacial interval saw sulfidic oceans with pervasive VOSC generation, leading to vertical isotopic gradients and superheavy pyrite precipitation.

Garmin GPSMAP 67i with inReach

Garmin GPSMAP 67i with inReach provides rugged GNSS navigation, satellite messaging, and SOS for backcountry geology and climate field teams.

Rethinking early atmospheric oxygen

Researchers propose a more complex biological oxygen cycle on early Earth, with sulfur isotope signals persisting in ocean sediments long after oxygen accumulation. This 'memory effect' could blur dating of the Great Oxidation Event and provide new insights into early life.