河南宜阳下三叠统刘家沟组微生物成因沉积构造演化及其对古环境变化的响应*
邢智峰1,2, 周虎1, 林佳1, 王敏1,2, 郑伟1,2

Evolution of Microbially Induced Sedimentary Structures and their response to palaeoenvironment variation of the Lower Triassic Liujiagou Formation in Yiyang area,Henan Province
Xing Zhi-Feng1,2, Zhou Hu1, Lin Jia1, Wang Min1,2, Zheng Wei1,2
河南宜阳地区下三叠统刘家沟组大型脱水裂痕组合 a—大型脱水裂痕组合发育层位(84~97 m),规模更大,席层更厚,表明此时微生物群落最为繁盛;b,c—大型网状脱水裂痕,脊宽10~20 mm,脊高5~15 mm;d—正弦状脱水裂痕,在波谷中沿波痕走向发育,脊高2 mm,脊宽4 mm;e—脱水裂痕底部,并无“V”字型底;f—曲型脱水裂痕,较厚的席层开裂后由于脱水作用使得边缘萎缩而聚集形成圆弧状,随后裂隙被填充从而形成曲型—圆弧状的脱水裂痕,在其下层还发育有皱饰构造