Under the hydrodynamitic condition in the outshelf heavy minerals are enriched to a certain extent . they are of horablede - epidote assemblage and contain some authigene ( pyrite and glauconite ) . the content of stable mineral is small and mineral maturity index ( trzg / hp ) is low 在外陆架水动力的作用下，重矿物有一定富集，重矿物以角闪石?绿帘石矿物组合为特征，含有一定量自生矿物(黄铁矿和海绿石) ，稳定矿物少，矿物成熟度低。
