REE patterns as a tool for recognition of diagenetic beds: a case from the Lower Devonian Upper Gaspe Limestone, Gaspe Peninsula, Quebec

Abstract

Siliciclastic rocks are richer in REE than coeval mechanically deposited carbonates. A positive relationship between the absolute amount of REE and the content of aluminosilicate is clear. The concretions also show a significant negative Europium anomaly. Mineralogical, major element and stable isotope data show that calcite cementation resulting in the concretions was rapid and completed before reaching the methanogenic zone. -from Authors