Jens Gutzmer

TL;DR: Sediment-hosted Pb-Zn deposits contain the world's greatest lead and zinc resources and dominate world production of these metals as discussed by the authors, however, these ores are divided into two broad subt)1Jes: Mississippi Valley type (MVT) and sedimentmy exhalative (SEDEX), despite the "exhalative" component inherent in the term SEDEX, in this manusclipt, direct evidence and direct evidence of an exhalite in the ore or alteration component is not essential for a deposit to be classified as SED

TL;DR: Geological, geophysical, and geochemical data support a theory that Earth experienced several intervals of intense, global glaciation ("snowball Earth" conditions) during Precambrian time, and this snowball model predicts that postglacial, greenhouse-induced warming would lead to the deposition of banded iron formations and cap carbonates.

TL;DR: In this article, the earliest recorded positive carbon isotope anomaly was found in the Transvaal Supergroup of South Africa, in phase with sulfur isotopes, and the authors linked these environmental perturbations to the Great Oxidation Event (ca. 2.3 Ga).

TL;DR: In this article, a meta-analysis of trace and minor element concentrations in sphalerite has been conducted and the results show that there are systematic, statistically significant differences in the mean concentrations of Fe, Ga, Ge, In and Mn in different deposit types, while Cd and Cu concentrations show no such differences.