论文部分内容阅读
对辽西地区黄花山角砾岩层的研究表明 ,黄花山角砾岩是一套火山碎屑岩 火山碎屑沉积岩类。黄花山角砾岩的形成大致可分为 2个阶段 :早期阶段以火山熔岩溢流和剧烈的火山爆发作用为主 ,不同地区形成了火山角砾岩 (火山碎屑岩 )或火山熔岩 ;晚期阶段 ,黄花山角砾岩成层性较好 ,以厚 中层为主 ,并且向上部韵律逐渐发育 ,表明这个时期渐变为以沉积作用为主 ,形成了火山碎屑沉积岩。黄花山角砾岩层和义县晚期的酸性火山熔岩同是义县组的顶部层位 ,二者为同时异相关系(但不是过渡关系 )。黄花山角砾岩层的定位对正确认识义县组以及研究阜新 义县盆地的演化史有着重要意义。
Studies on the Huanghuashan breccia layer in western Liaoning show that the Huanghua Shan breccia is a pyroclastic clastic sedimentary rock. The formation of the Hornishan breccia can be roughly divided into two stages: volcanic lava overflow and volcanic eruption in the early stage, volcanic breccia (volcaniclastic rocks) or volcanic lavas in different areas; late Stage, Huanghushan breccia stratification is better, mainly in thick middle and upper part of the rhythm gradually developed, indicating that this period gradually changed to mainly sedimentary, the formation of pyroclastic sedimentary rocks. The Huanghuashan breccia layer and the late Yixian acidic volcanic lava are the same as the top layers of the Yixian Formation, both of which are heterogeneous (but not transitional) at the same time. The location of the Hornishan breccia layer is of great significance for the correct identification of the Yixian Formation and the study of the evolution history of the Yixian Basin in Fuxin.