三山四群关系雏议

五台山及与之毗连的太行山、恒山,发育着四套早前寒武纪变质岩系.浅变质的滹沱群以巨厚的底砾岩不整合在五台群之上.高角闪岩相的恒山杂岩是五台群深变质及部分熔融的产物,以火山岩为主体的中浅变质的五台群向东推覆在浅海碳酸盐建造的经受高角闪岩相变质的阜平群之上,两者属同时异相的沉积.它们之间的推覆韧性剪切带被过去认为是五台群底部碎屑岩(实系滹沱群下部地层)所沉积不整合。 恒山杂岩和阜平群中大面积分布着五台期侵入的灰色片麻岩.有证据表明五台群、阜平群及恒山杂岩都是在2800Ma结晶基底上发育起来,同时在2500Ma遭受褶皱,变质并被灰色片麻岩所侵入。

RELATIONSHIP AMONG THE FOUR GROUPS AT THREE MOUNTAINS

Four series of precambrian metamorphic rocks have been recognized in Wutai Mt. and the adjacent Taihang Mt. Hengshan. The low metamorphosed Hutuo Gr. with its thick bottom conglomerate overlies unconformably on wutai Gr. Hengshan complexes belong to deeply metamorphosed part of Wutai Gr. Low-middle metamorphosed Wutai Gr. which drived from volcanic rocks is thrown up on Fuping Gr. toward east. The Fuping Gr. undergo metamorphism of high amphibolite facies is formed by Carbonate formation. Both the Wutai Gr. and the Fuping Gr. are synchronous out-of-phase deposits. In the past, the nappe ductile shear zone between them was regarded clastic rock of the bottom of Wutai Gr..Largely distributed gray gneiss in Hengshan complex and Fuping Gr. intruded during Wutai period. The Wutai Gr. Fuping Gr. and Hengshan Complex construct the crystalltine basement at 2800Ma. They were folded. metamorphosed and finally intruded by the gray gneiss at 2500Ma.