辽河群孔达岩系原岩建造及沉积环境分析

PROTOLITH FORMATION AND SEDIMENTARY ENVIRONMENT OF KONGDA ROCK SEKIES IN LIAONING GROUP

辽宁省辽河群孔达岩系分在于营口－草河口复向斜南北两翼，主要由各类片岩、变粒岩、片麻岩夹斜长角闪岩、大理岩组成，为高绿片岩相和低角闪岩相，原岩属碳酸盐岩富碳的陆源碎屑－粘土沉积建造。孔达岩系中石墨稳定同位素研究表明，石墨与有机墨有关，可能来源于低等生物；沉积时期的古气候为温湿－亚热带，沉积物质来源于海底火山喷发和陆源碎屑，沉积环境为浅海微淡化水体，低能、强还原环境的泻湖相。

The kongda rock series in Liaohe Group, occurring on the south and north wings ofYingkou-Chaohekou synclinorium ,are mainly corisisted of schist,leptynite,gneiss, secondlyamphibolite and marble interbeded in above rocks,which all are of high-greenshist and low-amphibolite facies and their protolith is carbonate-bearing carbon-rich terrigenous clay sedi-mentary formation. The studies on stable isotopes from graphite in kongda rock series showthat the graphite is related with organic carbon which probably stemed from the lower-gradeliving beings;during sedimentation,the palaeoclimate vvas temperate humid-subtropical zoneand the sediments originated from submarine volcanic eruption and terrigenous clasts;thesedimentary environment was a lagoonal facies which the water body was slightly diluted inshallow sea and in an environment of strong reduction.