皖北新元古代望山组震积岩的基本特征及其形成环境分析

THE CHARACTERS AND ENVIRONMENTS OF THE SEISMITES OF THE NEOPROTERZOIC WANGSHAN FORMATION IN NORTH ANHUI

皖北望山组碳酸盐岩中含有大量液化碳酸盐脉、液化变形、角砾岩等震积岩特征 ,是皖北新元古代地层中含震积岩的重要层位。根据震积岩的特征及其在剖面上的分布将望山组沉积期的地震活动分为三期 ;依据对该组碳酸盐岩的沉积特点的分析认为望山组沉积期的地震活动发生在浅海环境中。这些地震活动与新元古代华北板块内的构造—岩浆活动有关。

The characters of seismites such as liquefied carbonate veins, breccia and liquefied deformation are obvious in the carbonate of the Wangshan Formation, which is an important strata of the Proterozoic in North Anhui. The characters and distribution of the seismites in the carbonatite and the depositional characters of the carbonatites suggest that the earthquakes occurred three times in the shallow ocean environments during the depositional period of the Wangshan Formation. The seismic events may be related with the tectonics and magma activities of the North China Block in the Neoproterozoic.