华北陆块南缘下震旦统顶部裂离不整合的发现及其地质意义

Discovery of Breakup Uncomnformity at the Top of Lower Sinian in the South Margin of North China Block: the Geological Implication

华北陆块南缘四十里长山地区下震旦统四顶山组叠层石白云岩与其上部凤台砾岩的接触界面上为一薄层黄铁矿,对其宏观和微观以及地球化学特征研究表明,这一接触界面为裂离不整合。这一裂离不整合的发现和确认为研究华北陆块在Rodnia超大陆裂解时期的地质响应提供了直接依据,也为研究凤台砾岩及其相对应地层的成因提供了重要的构造背景条件。

A film of pyrites was discovered on the interface of Lower Sinian Sidingshan Formation and Fengtai conglomerate, at Sishilichangshan Mountains in the south margin of the North China Block. The macroscopic, microscopic and geochemical studies of the film of pyrite reveal that the interface is a breakup unconformity. The discovery and determination of the breakup unconformity provides substantive proof for studying geological response of North China Block at the interval of Rodinia supercontinent breakup, and offers important tectonic background for studying the genesis of Fengtai conglomerate and its equivalence.