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通过对额尔古纳地区中生代火山岩新的岩石化学、微量元素、构造等方面的分析， 表明该地区中生代火山岩（主要指塔木兰沟组（Ｊ_３ｔ）火山岩、上库力组（Ｋ_１ｓ）火山岩是形成在的明 显的挤压环境中；再结合区域构造、区域岩浆作用、古地磁特征和稳定同位素分析，笔者得出以 下认识；１、该区中生代火山岩岩浆来源较深（幔源）；岩浆是挤压背景下，“减压－剪切”作用的产 物，而不是裂谷环境中的产物，从而使得岩浆在演化过程中混入了大量的壳源物质；２、中生代火 山活动大致分两个亚族回，其中塔木兰沟组（Ｊ_３ｔ）火山岩和上库力组（Ｋ_１Ｓ）火山岩是同一岩浆亚 族回的产物，并构成一个完整的亚族回。
The analysis of new petrochemistry, trace elements and tectonics of the Mesozoic volcanic rocks in the Erguna area shows that the Mesozoic volcanic rocks in the area mainly consist of the volcanic rocks of the Tamanggou Formation and K_1s volcanic rocks. In the obvious compression environment, combined with the regional tectonics, regional magmatism, paleomagnetic features and stable isotope analysis, the author draws the following understanding: 1, the area of the Mesozoic volcanic rock magma source is deep (mantle source); magma is crowded Under the background of pressure, the product of the “decompression-shear” effect rather than the product of the rifting environment made the magma mix a large amount of crustal material in the evolutionary process. 2. The Mesozoic volcanic activity is generally divided into two subfamilies The Tumulangou Formation (J_3t) volcanic rocks and the Upper Kulis Formation (K_1S) volcanic rocks are the products of the same magma subfamily, and form a complete subfamily back.