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四川盆地中二叠统茅口组米兰科维奇旋回及高频层序*
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张运波1, 王根厚1, 余正伟1, 赵宗举2, 王明健3, 孙衍鹏4 |
Milankovitch cycles and high-frequency sequences of the Middle Permian Maokou Formation in Sichuan Basin
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Zhang Yunbo 1, Wang Genhou 1, Yu Zhengwei 1, Zhao Zongju 2, Wang Mingjian 3, Sun Yanpeng 4
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四川盆地中二叠统层序PSQ2底界及其凝缩段沉积特征 a—层序PSQ2底界,其下为栖霞组顶部灰白色块状斑状白云石化亮晶砂屑灰岩,其上为茅口组底部深灰色中层状泥晶生屑灰岩和生屑泥晶灰岩夹泥质灰岩;b—层序PSQ2凝缩段,黑灰色钙质泥岩夹少量深灰色薄—中层状、局部透镜状生屑泥晶灰岩;c—层序PSQ2高位体系域薄—中层灰色生屑泥晶灰岩与中—厚层灰色泥晶生屑灰岩构成的向上变浅的高频旋回,茅口组第34~36层;d—层序PSQ2顶界,茅口组内部,其下为厚层泥亮晶生屑砂屑灰岩(第47层),其上为中薄层生屑泥晶灰岩(第48层) |
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