Exceptional sulfur and iron isotope enrichment in millimetre-sized, early Palaeozoic animal burrows.

ABSTRACT: Pyrite-δ³⁴S and -δ⁵⁶Fe isotopes represent highly sensitive diagnostic paleoenvironmental proxies that express high variability at the bed (< 10 mm) scale that has so far defied explanation by a single formative process. This study reveals for the first time the paleoenvironmental context of exceptionally enriched pyrite-δ³⁴S and -δ⁵⁶Fe in bioturbated, storm-reworked mudstones of an early Ordovician storm-dominated delta (Tremadocian Beach Formation, Bell Island Group, Newfoundland). Very few studies provide insight into the low-temperature sulfur and iron cycling from bioturbated muddy settings for time periods prior to the evolution of deep soil horizons on land. Secondary ion mass spectroscopy (SIMS) analyses performed on Beach Formation muddy

SUBMITTER: Harazim D 

PROVIDER: S-EPMC7679392 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature