Epochs of Diamond Placer Formation in the Precambrian and Phanerozoic

摘要

Diamond paleoplacers in conglomerates intermittently formed during almost the entire geological history. Several epochs of their formation are distinguished in the Early Precambrian, Late Precambrian, and Phanerozoic Such paleoplacers, as well as REE-bearing ones, are a peculiar indicator of epochs of alkaline ultramafic (including kimberlitic) magmatism related to continental rifting. Diamond paleoplacers are also an important indicator of epochs of ancient peneplanation and development of chemical weathering crusts, because most of them are confined to highly mature terrigenous formations.