松辽盆地营城组火山岩蚀变转化为膨润土或发生膨润土化现象较普遍，出露较大型的膨润土矿主要在九台银矿山一带。
It is known that the volcanic rocks of the Yingcheng Formation were altered into bentonite in the Songliao Basin, and the major bentonite deposits in the area are located in Jiutai City.
松辽盆地营城组火山岩蚀变转化为膨润土或发生膨润土化现象较普遍，出露较大型的膨润土矿主要在九台银矿山一带。
It is known that the volcanic rocks of the Yingcheng Formation were altered into bentonite in the Songliao Basin, and the major bentonite deposits in the area are located in Jiutai City.
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