摘要:
本文概略介绍了辽宁北部汛河地区,蓟县系雾迷山组中部,厚度达1000m海相火山岩产出层位,与上、下地层接触关系,矿物成分及结构构造,岩石化学等基本特点。该火山岩为细碧岩具枕状构造,并夹较多砂岩、板岩、白云岩等沉积岩,属海相环境火山喷发产物,说明本区在雾迷山中期为一强烈活动区。
Abstract:
A sequence of marine volcanic rocks （the Erdaogou Subformation） up to 1000 m thick is developed in the central part of the Wumishan Formation of the Jixian System in the Xunhe area in northern Liaoning. This paper briefly describes its stratigraphic position, its contact relationships with the overlying and underlying strata, and its mineralogy, textures and structures and petro- chemistry. This sequence is represented by spilite （or albitized basalt） with a pillow structure, intercalated with a lot of sedimentary rocks such as sandstone, slate and dolomite, belonging to the product of volcanic eruption and sedimen- tation in marine environments. This implies that intense volcanic eruption took place in the middle Miwushaian stage of the Jixian period in the area. This situation is quite different from the structural and depositional environments in North China and other regions.
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