豫晋陕熊耳群沉积岩夹层特征与沉积环境

THE CHARACTERISTICS AND SEDIMENTARY ENVIRONMENT OF SEDIMENTARY INTERBEDS OF XIONG'ER GROUP DISTRIBUTED IN THE JUNCTURE OF HENAN-SHANXI-SHAANXI PROVINCES

中元古界熊耳群火山岩广泛分布于豫晋陕交界地带的华北板块南缘，时限为１８５０～１６５０Ｍａ。通过火山熔岩中沉积岩夹层（砂岩、泥岩、硅质岩和碳酸盐岩等）的岩石学和地球化学研究，表明熊耳群形成于被动大陆边缘的构造环境，生成的古地理环境是以陆相为主，晚期才有海水入侵，沉积了一些海相沉积物。

The Middle Proterozoic Xiong’er Group volcanic rocks were distributed widely in the juncture of Henan-Shanxi-Shaanxi provinces on the southern of North China plate. It was formed between 1850 Ma and 1650Ma. Based on the study for petrology and geochemistry of sedimentary interbeds such as sandstone, mudstone, silicalite and carbonate rock in volcanic lava, we have considered that Xiong'er Group was formed in the tectonic setting of passive continental margin; its paleogeographic environment mainly was continental facies, seawater encroachment was just in time on later period, meanwhile there were marine sedimentary sediments.