摘要
汪家店地区上泥盆统王冠沟组（D3w）发育了两种生物灰岩类型：生物障积灰岩和生物粘结灰岩．根据生物生态特征、造礁方式和岩石产出形态，可以划分为层状礁和生物丘，它们形成在不同的水动力条件下，具有不同的沉积环境．总体上都形成于水体较浑浊、较深的潮下低能环境中．
Two types of biogenetic limestones are well developed in the Upper Devonian Wang- guangou Formation in the Wangjiandian region,Shangnan,Shaanxi.They are bafflestone and bindstone,which may be subdivided,according to ecological characteristics,reef-build- ing modes and occurrences,in to bedded reefs and bioherms produced in distinctive environ- ments under different hydrodynamic conditions.Commonly,they were all formed in more turbid-and deeper-water subtidal low-energy environments.
关键词
生物灰岩
层状礁
沉积特征
王冠沟组
上泥盆统
biogenic limestone
bedded reef
bioherm
sedimentary characteristic
Wangguangou Formation
Wangjiadian region in Shangnan
