河南云台山世界地质公园云梦山组波痕类型及其成因分析

Classification and genetic analysis of ripple marks on Yunmengshan Formation of Yuntaishan world geopark,Henan province

河南焦作云台山世界地质公园红石峡的地层主要为新元古界云梦山组,在该组地层中发现了大量的原生波痕.云梦山组发现的波痕以小水流波痕和浪成波痕为主,少量存在有干涉波痕、削顶波痕和双脊波痕.从云梦山组下部往上,波痕类型逐渐由直线型不对称小水流波痕变化为波曲型对称浪成波痕,说明沉积环境由极浅水的前滨过渡为浅水的临滨环境.

Neoproterozoic Yunmengshan Formation is widely distributed in Redstone gorge of Yuntaishan world geopark , Henan province. Abundant ripple marks were found in strata of the Formation. The research results indicates that the ripple marks of Yunmengsban Formation are dominated by small current and wave ripple marks with minority interference, scalped and bimodat ripple marks. From bottom to top of Yunmengshan Formation, the ripple marks gradually change from rectilineal, asymmetrical current ripple marks into sinusoidal, symmetrical wave ripple marks, which reveals that sedimentary environments of the strata become deepening upward from very shallow foreshore to shallow shoreface environment.